1st Security Bank of Washington
1st Security Bank of Washington is an FDIC-insured institution based in Mountlake Terrace, Washington, with $3.2 billion in assets and $2.5 billion in deposits as of 30 June 2026. The FDIC’s 2026 branch survey counts 30 branches in 13 counties.
| FDIC certificate | 57633 |
|---|---|
| Charter class | Not published |
| Established | Not published |
| Assets | $3.2 billion |
| Deposits | $2.5 billion |
| Offices | 34 |
| Net income, year to date | $17.5 million |
| Return on assets | 1.09% |
| Website | WWW.FSBWA.com |
| Mortgage lending | 1st Security Bank of Washington reported 1,591 mortgages made in 2025. |
Branches by county, 2026
| County | Branches | Deposits |
|---|---|---|
| Grays Harbor County, WA | 6 | $264.9 million |
| Snohomish County, WA | 4 | $798.8 million |
| Clallam County, WA | 2 | $256.5 million |
| Jefferson County, WA | 2 | $232.5 million |
| King County, WA | 2 | $161.1 million |
| Lincoln County, OR | 2 | $130.6 million |
| Thurston County, WA | 2 | $120.8 million |
| Pierce County, WA | 2 | $120.8 million |
| Klickitat County, WA | 2 | $112.9 million |
| Kitsap County, WA | 2 | $95.5 million |
| Tillamook County, OR | 2 | $93.0 million |
| Malheur County, OR | 1 | $78.0 million |
| Benton County, WA | 1 | $54,000 |
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Counts, medians and denial shares are computed from the Home Mortgage Disclosure Act loan-level file for 2025, published by the Consumer Financial Protection Bureau through the FFIEC: every application a covered lender received, as the lender reported it. Branches and deposits come from the FDIC Summary of Deposits as of 30 June 2026, and bank balance sheets from the FDIC institutions directory. A median rate is what borrowers got, not what you will be offered — it depends on the loan, the property, your credit and the market on the day, and no figure here is a quote. A median over fewer than 10 loans is not shown: it is a number with no meaning and a real person's rate half-exposed. Those cells say "under 10 loans" and the count is still published. This is information, not advice, and no lender pays to appear.