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Note 15 - Regulatory Capital - Schedule of Comparison (Details)
$ in Thousands
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Parent Company [Member]    
Actual, Capital, Rate 0.1453 0.1373
Actual, Tier 1 Risk-based Rate 0.1136 0.1051
Actual, Tier 1 Leverage Rate 0.0987 0.0901
Actual, CET 1 Rate 0.1136 0.1051
Total risk-based capital (to risk-weighted assets) 0.1453 0.1373
Tier 1 risk-based capital (to risk-weighted assets) 0.1136 0.1051
Tier 1 leverage capital (to average assets) 0.0987 0.0901
CET 1 capital (to risk-weighted assets) 0.1136 0.1051
The 1st Security Bank of Washington, Subsidiary [Member]    
Actual, Capital $ 368,953 $ 339,436
Actual, Capital, Rate 0.1418 0.1337
Capital Adequacy, Total $ 208,174 $ 203,094
Capital Adequacy, Total Rate 0.08 0.08
Capital Adequacy, Total Risk-based with Buffer $ 273,228 $ 266,561
Capital Adequacy, Total Risk-based with Buffer, Rate 0.105 0.105
Well Capitalized, Total Capital $ 260,218 $ 253,868
Well Capitalized, Total Capital Rate 0.10 0.10
Actual, Tier 1 Risk-based $ 336,416 $ 307,686
Actual, Tier 1 Risk-based Rate 0.1293 0.1212
Capital Adequacy, Tier 1 Risk-based $ 156,131 $ 152,321
Capital Adequacy, Tier 1 Risk-based Rate 0.06 0.06
Capital Adequacy, Tier 1 Risk-based with Buffer $ 221,185 $ 215,787
Capital Adequacy, Tier 1 Risk-based with Buffer, Rate 0.085 0.085
Well Capitalized, Tier 1 Risk-based $ 208,174 $ 203,094
Well Capitalized, Tier 1 Risk-based Rate 0.08 0.08
Actual, Tier 1 Leverage $ 336,416 $ 307,686
Actual, Tier 1 Leverage Rate 0.1124 0.1039
Capital Adequacy, Tier 1 Leverage $ 119,741 $ 118,488
Capital Adequacy, Tier 1 Leverage Rate 0.04 0.04
Well Capitalized, Tier 1 Leverage $ 149,676 $ 148,109
Well Capitalized, Tier 1 Leverage Rate 0.05 0.05
Actual, CET 1 $ 336,416 $ 307,686
Actual, CET 1 Rate 0.1293 0.1212
Capital Adequacy, CET 1 $ 117,098 $ 114,240
Capital Adequacy, CET 1 Rate 0.045 0.045
Capital Adequacy, CET 1 with Buffer $ 182,152 $ 177,707
Capital Adequacy, CET 1 with Buffer , Rate 0.07 0.07
Well Capitalized, CET 1 $ 169,141 $ 165,014
Well Capitalized, CET 1 Rate 0.065 0.065
Total risk-based capital (to risk-weighted assets) 0.1418 0.1337
Tier 1 risk-based capital (to risk-weighted assets) 0.1293 0.1212
Tier 1 leverage capital (to average assets) 0.1124 0.1039
CET 1 capital (to risk-weighted assets) 0.1293 0.1212