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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Common equity tier 1 capital to risk-weighted assets    
Amount $ 1,677,840 $ 1,661,542
Ratio (as a percent) 12.15% 11.97%
Minimum Capital Ratio (as a percent) 4.50% 4.50%
Well-Capitalized Ratio (as a percent) 6.50% 6.50%
Tier 1 capital to risk-weighted assets    
Amount $ 1,677,840 $ 1,661,542
Ratio (as a percent) 12.15% 11.97%
Minimum Capital Ratio (as a percent) 6.00% 6.00%
Well-Capitalized Ratio (percent) 8.00% 8.00%
Total capital to risk-weighted assets    
Amount $ 1,811,404 $ 1,803,860
Ratio (as a percent) 13.11% 12.99%
Minimum Capital Ratio (as a percent) 8.00% 8.00%
Well-Capitalized Ratio (as a percent) 10.00% 10.00%
Tier 1 capital to average assets (leverage ratio)    
Amount $ 1,677,840 $ 1,661,542
Ratio 8.68% 8.72%
Minimum Capital Ratio (as a percent) 4.00% 4.00%
Well-Capitalized Ratio (percent) 5.00% 5.00%
First Hawaiian Bank (FHB)    
Common equity tier 1 capital to risk-weighted assets    
Amount $ 1,662,785 $ 1,658,172
Ratio (as a percent) 12.04% 11.94%
Tier 1 capital to risk-weighted assets    
Amount $ 1,662,785 $ 1,658,172
Ratio (as a percent) 12.04% 11.94%
Total capital to risk-weighted assets    
Amount $ 1,796,349 $ 1,800,490
Ratio (as a percent) 13.00% 12.97%
Tier 1 capital to average assets (leverage ratio)    
Amount $ 1,662,785 $ 1,658,172
Ratio 8.61% 8.70%