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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Common equity tier 1 capital to risk-weighted assets    
Actual Amount $ 1,632,669 $ 1,633,442
Actual Ratio (as a percent) 12.09% 12.45%
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    
Actual Amount $ 1,632,669 $ 1,633,442
Actual Ratio (as a percent) 12.09% 12.45%
Minimum Capital Ratio (as a percent) 6.00% 6.00%
Well-Capitalized Ratio (percent) 8.00% 8.00%
Total capital to risk-weighted assets    
Actual Amount $ 1,774,519 $ 1,771,295
Actual Ratio (as a percent) 13.14% 13.50%
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)    
Actual Amount $ 1,632,669 $ 1,633,442
Actual Ratio 8.42% 8.52%
Minimum Capital Ratio (as a percent) 4.00% 4.00%
Well-Capitalized Ratio (percent) 5.00% 5.00%
First Hawaiian Bank    
Common equity tier 1 capital to risk-weighted assets    
Actual Amount $ 1,629,109 $ 1,623,455
Actual Ratio (as a percent) 12.06% 12.37%
Tier 1 capital to risk-weighted assets    
Actual Amount $ 1,629,109 $ 1,623,455
Actual Ratio (as a percent) 12.06% 12.37%
Total capital to risk-weighted assets    
Actual Amount $ 1,770,959 $ 1,761,308
Actual Ratio (as a percent) 13.11% 13.42%
Tier 1 capital to average assets (leverage ratio)    
Actual Amount $ 1,629,109 $ 1,623,455
Actual Ratio 8.41% 8.47%