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Note 14 - Regulatory Capital - Schedule of Comparison (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Actual, Capital, Rate 0.141 0.137
Actual, Tier 1 Risk-based Rate 0.109 0.105
Actual, Tier 1 Leverage Rate 0.092 0.09
Actual, CET 1 Rate 0.109 0.105
First Security Bank of Washington, Subsidiary [Member]    
Actual, Capital $ 346,551 $ 339,436
Actual, Capital, Rate 0.1372 0.1337
Capital Adequacy, Total $ 202,098 $ 203,094
Capital Adequacy, Total Rate 0.08 0.08
Capital Adequacy, Total Risk-based with Buffer $ 265,253 $ 266,561
Capital Adequacy, Total Risk-based with Buffer, Rate 0.105 0.105
Well Capitalized, Total Capital $ 252,622 $ 253,868
Well Capitalized, Total Capital Rate 0.10 0.10
Actual, Tier 1 Risk-based $ 314,938 $ 307,686
Actual, Tier 1 Risk-based Rate 0.1247 0.1212
Capital Adequacy, Tier 1 Risk-based $ 151,573 $ 152,321
Capital Adequacy, Tier 1 Risk-based Rate 0.06 0.06
Capital Adequacy, Tier 1 Risk-based with Buffer $ 214,729 $ 215,787
Capital Adequacy, Tier 1 Risk-based with Buffer, Rate 0.085 0.085
Well Capitalized, Tier 1 Risk-based $ 202,098 $ 203,094
Well Capitalized, Tier 1 Risk-based Rate 0.08 0.08
Actual, Tier 1 Leverage $ 314,938 $ 307,686
Actual, Tier 1 Leverage Rate 0.1061 0.1039
Capital Adequacy, Tier 1 Leverage $ 118,727 $ 118,488
Capital Adequacy, Tier 1 Leverage Rate 0.04 0.04
Well Capitalized, Tier 1 Leverage $ 148,408 $ 148,109
Well Capitalized, Tier 1 Leverage Rate 0.05 0.05
Actual, CET 1 $ 314,938 $ 307,686
Actual, CET 1 Rate 0.1247 0.1212
Capital Adequacy, CET 1 $ 113,680 $ 114,240
Capital Adequacy, CET 1 Rate 0.045 0.045
Capital Adequacy, CET 1 with Buffer $ 176,835 $ 177,707
Capital Adequacy, CET 1 with Buffer , Rate 0.07 0.07
Well Capitalized, CET 1 $ 164,204 $ 165,014
Well Capitalized, CET 1 Rate 0.065 0.065