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Note 12 - Regulatory Capital - Schedule of Comparison (Details)
$ in Thousands
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Parent Company [Member]    
Actual, Capital, Rate 0.1414 0.1453
Actual, Tier 1 Risk-based Rate 0.1106 0.1136
Actual, Tier 1 Leverage Rate 0.0965 0.0987
Actual, CET 1 Rate 0.1106 0.1136
Total risk-based capital (to risk-weighted assets) 0.1414 0.1453
Tier 1 risk-based capital (to risk-weighted assets) 0.1106 0.1136
Tier 1 leverage capital (to average assets) 0.0965 0.0987
CET 1 capital (to risk-weighted assets) 0.1106 0.1136
The 1st Security Bank of Washington, Subsidiary [Member]    
Actual, Capital $ 383,094 $ 368,953
Actual, Capital, Rate 0.1406 0.1418
Capital Adequacy, Total $ 218,023 $ 208,174
Capital Adequacy, Total Rate 0.08 0.08
Capital Adequacy, Total Risk-based with Buffer $ 286,156 $ 273,228
Capital Adequacy, Total Risk-based with Buffer, Rate 0.105 0.105
Well Capitalized, Total Capital $ 272,529 $ 260,218
Well Capitalized, Total Capital Rate 0.10 0.10
Actual, Tier 1 Risk-based $ 349,058 $ 336,416
Actual, Tier 1 Risk-based Rate 0.1281 0.1293
Capital Adequacy, Tier 1 Risk-based $ 163,517 $ 156,131
Capital Adequacy, Tier 1 Risk-based Rate 0.06 0.06
Capital Adequacy, Tier 1 Risk-based with Buffer $ 231,650 $ 221,185
Capital Adequacy, Tier 1 Risk-based with Buffer, Rate 0.085 0.085
Well Capitalized, Tier 1 Risk-based $ 218,023 $ 208,174
Well Capitalized, Tier 1 Risk-based Rate 0.08 0.08
Actual, Tier 1 Leverage $ 349,058 $ 336,416
Actual, Tier 1 Leverage Rate 0.1118 0.1124
Capital Adequacy, Tier 1 Leverage $ 124,895 $ 119,741
Capital Adequacy, Tier 1 Leverage Rate 0.04 0.04
Well Capitalized, Tier 1 Leverage $ 156,119 $ 149,676
Well Capitalized, Tier 1 Leverage Rate 0.05 0.05
Actual, CET 1 $ 349,058 $ 336,416
Actual, CET 1 Rate 0.1281 0.1293
Capital Adequacy, CET 1 $ 122,638 $ 117,098
Capital Adequacy, CET 1 Rate 0.045 0.045
Capital Adequacy, CET 1 with Buffer $ 190,770 $ 182,152
Capital Adequacy, CET 1 with Buffer , Rate 0.07 0.07
Well Capitalized, CET 1 $ 177,144 $ 169,141
Well Capitalized, CET 1 Rate 0.065 0.065
Total risk-based capital (to risk-weighted assets) 0.1406 0.1418
Tier 1 risk-based capital (to risk-weighted assets) 0.1281 0.1293
Tier 1 leverage capital (to average assets) 0.1118 0.1124
CET 1 capital (to risk-weighted assets) 0.1281 0.1293