1st Security Bank
Home Lending

About Us


1st Security Bank Home Lending is dedicated to giving you the best customer service in the mortgage industry. We are part of a wonderful community bank serving the Puget Sound area. Our mission is to “WOW” each and every client. With loan officers who have tremendous experience and success, backed by an incomparable support staff, we are able to find loans that fit your lifestyle, financial goals and budget. We can help you choose from a full list of loan products, many of them unique to our bank. And we offer fast service. Loans are approved “in-house,” cutting the wait time substantially--loans are often closed loans within 30 days.

1st Security Bank was rated the #1 bank based in Washington State with over $100 million in assets by Banker's Caddy, an independent bank rating agency in St. Louis, Missouri; was named one of the top 200 Healthiest Banks in the U.S. by DepositAccounts.com in 2014, 2015 and 2016; was named a finalist in its class in the Puget Sound Business Journal's 2015, 2016 and 2017 Washington's Best Workplaces contests; was named one of 34 "Bank and Thrift All Stars" by Sandler O'Neill, and is a repeat recipient of the Raymond James Community Bankers Cup Award.

We look forward to serving you, and adding you to our list of happy, “WOWED” customers.

Contact Us


Mailing Address: 
6920 220th St SW
Mountlake Terrace, WA 98043

Find: Branch or Loan Officer

Call: 888.997.8115
Fax: 425.944.9622

Executive Leadership


Debbie Steck

Executive Vice President

With over two decades of mortgage industry experience, Debbie Steck gives 1st Security Bank's Home Lending team an experienced leader in charge of its operations. She joined the bank in late 2011 to help the bank build a strong mortgage division and was immediately taken with the company's core values.

"I feel fortunate to help direct 1st Security's home lending effort," Steck remarked. "The bank's core values, focus on community and extraordinary service, are highly valued among our team. We intend to do great things and are excited about the future."

Of her 20 plus years in the business, Steck spent 15 of them with Golf Savings Bank and its predecessor, Lynnwood Financial. She was Chief Operating Officer and Vice President of Production at Golf, all while being a top producing loan officer with both companies. Steck also served as Operations Executive, Senior Vice President with Sterling Savings Bank's home lending division; the company that purchased Golf in 2006. She served as a branch manager with Golf for nine years and was part of the team that led the bank in 2010 to become the top mortgage lender among banks headquartered in Washington, closing nearly $3 billion in home loans. 

Throughout her career she has been effective in streamlining financial operations and has developed a leadership style to accomplish objectives and meet critical deadlines in the fast-paced lending business. She was recognized for her outstanding sales performance for a ten-year period, landing among the top five loan officers company-wide at Golf. She started in the industry as a processor/closer and then loan processor before joining Phoenix Mortgage in Seattle as a loan officer. Steck has also served as a guest speaker at several industry conferences and as an instructor at Bellevue Community College.

Donn C Costa

Executive Vice President

For over 28 years, Donn Costa's career in the mortgage industry has continued to thrive. Today, as Executive Vice President of Home Lending for Washington's 1st Security Bank, Costa has a new challenge, and one he relishes. Appointed to his position in late 2011, Costa looks to take 1st Security's home lending effort to the top, a place where he is most familiar.

"Our success is built on a strategy of making a positive difference in the communities we serve, and being an employer of choice," Costa explained. "It is our goal to make home lending and banking an enjoyable experience for our clients. We work hard to make our community bank your bank for life."

And Costa knows how to accomplish that.

From his most recent position as Executive Vice President with Sterling Savings Bank, from his role as President of Lynnwood Financial Corporation (parent company of the very successful Golf Savings Bank), to his early days in the business, he has risen to the top of the ranks. Costa began his career in 1986 as a loan officer with Lomas and Nettleton Mortgage Company, which followed his 1985 cum laude graduation from Washington State University with a Bachelor's degree in Business Administration. 

From 1987 to 1994 he established himself as a leading loan officer at Phoenix Mortgage Company, consistently making the prestigious President's Club. At Lynnwood Financial, which he joined in 1994, he set the bar higher when that company became one of the top lenders in the area. Converted to a full service bank in 2000, and known as Golf Savings Bank, he, and his bank, soared to new heights. Golf, purchased by Sterling Financial in 2006, was one of the top three home lending companies in the state and in his last full year with Golf in 2010, Costa led the bank's mortgage division to record heights by closing nearly $3 billion in home loans, which was the most of any bank headquartered in the State of Washington.

Costa is past president of the Washington Mortgage Lenders and the Seattle Mortgage Bankers. He has served on the advisory board of Fannie Mae and Freddie Mac. Beyond that, he embraces the culture at 1st Security, with its focus on people, community, top-level service, outstanding performance and its desire to be the best in the business. And with Costa's track record, it should only be a matter of time before 1st Security Bank is known as an outstanding community home lender.


Apply now for a better mortgage experience through 1st Security Bank