v3.26.1
Regulatory Capital Requirements (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended
Jul. 31, 2026
$ / shares
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Common equity tier 1 capital to risk-weighted assets      
Amount   $ 2,189,274 $ 2,142,013
Ratio (as a percent)   0.1327 0.1317
Minimum Capital Ratio (as a percent)   0.045 0.045
Well-Capitalized Ratio (as a percent)   0.065 0.065
Tier 1 capital to risk-weighted assets      
Amount   $ 2,189,274 $ 2,142,013
Ratio (as a percent)   0.1327 0.1317
Minimum Capital Ratio (as a percent)   0.06 0.06
Well-Capitalized Ratio (percent)   0.08 0.08
Total capital to risk-weighted assets      
Amount   $ 2,395,002 $ 2,345,269
Ratio (as a percent)   0.1452 0.1442
Minimum Capital Ratio (as a percent)   0.08 0.08
Well-Capitalized Ratio (as a percent)   0.10 0.10
Tier 1 capital to average assets (leverage ratio)      
Amount   $ 2,189,274 $ 2,142,013
Ratio   0.0946 0.0927
Minimum Capital Ratio (as a percent)   0.04 0.04
Well-Capitalized Ratio (percent)   0.05 0.05
Common Stock | 2026 Q3 Dividend | Subsequent event      
Tier 1 capital to average assets (leverage ratio)      
Dividend declared date 2026-07    
Quarterly cash dividend (dollars per share) | $ / shares $ 0.26    
Dividend paid date Aug. 28, 2026    
Dividend record date Aug. 17, 2026    
First Hawaiian Bank (FHB)      
Common equity tier 1 capital to risk-weighted assets      
Amount   $ 2,183,260 $ 2,129,855
Ratio (as a percent)   0.1323 0.131
Tier 1 capital to risk-weighted assets      
Amount   $ 2,183,260 $ 2,129,855
Ratio (as a percent)   0.1323 0.131
Total capital to risk-weighted assets      
Amount   $ 2,388,988 $ 2,333,149
Ratio (as a percent)   0.1448 0.1435
Tier 1 capital to average assets (leverage ratio)      
Amount   $ 2,183,260 $ 2,129,855
Ratio   0.0944 0.0922