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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Regulatory capital requirements    
Limit on allowable reserve for credit losses for total risk-based capital ratio as a percentage of risk-weighted assets 1.25% 1.25%
Common equity tier 1 capital to risk-weighted assets    
Amount $ 1,912,767 $ 1,783,113
Ratio (as a percent) 0.1182 0.1224
Minimum Capital Ratio (as a percent) 0.0450 0.0450
Well-Capitalized Ratio (as a percent) 0.0650 0.0650
Tier 1 capital to risk-weighted assets    
Amount $ 1,912,767 $ 1,783,113
Ratio (as a percent) 0.1182 0.1224
Minimum Capital Ratio (as a percent) 0.0600 0.0600
Well-Capitalized Ratio (percent) 0.0800 0.0800
Total capital to risk-weighted assets    
Amount $ 2,090,502 $ 1,965,280
Ratio (as a percent) 0.1292 0.1349
Minimum Capital Ratio (as a percent) 0.0800 0.0800
Well-Capitalized Ratio (as a percent) 0.1000 0.1000
Tier 1 capital to average assets (leverage ratio)    
Amount $ 1,912,767 $ 1,783,113
Ratio 0.0811 0.0724
Minimum Capital Ratio (as a percent) 0.0400 0.0400
Well-Capitalized Ratio (percent) 0.0500 0.0500
First Hawaiian Bank (FHB)    
Common equity tier 1 capital to risk-weighted assets    
Amount $ 1,895,693 $ 1,769,214
Ratio (as a percent) 0.1171 0.1214
Tier 1 capital to risk-weighted assets    
Amount $ 1,895,693 $ 1,769,214
Ratio (as a percent) 0.1171 0.1214
Total capital to risk-weighted assets    
Amount $ 2,073,428 $ 1,951,377
Ratio (as a percent) 0.1281 0.1340
Tier 1 capital to average assets (leverage ratio)    
Amount $ 1,895,693 $ 1,769,214
Ratio 0.0804 0.0718