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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
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%  
Common equity tier 1 capital to risk-weighted assets    
Actual Amount $ 1,569,004 $ 1,792,701
Actual Ratio (as a percent) 12.75% 15.31%
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 $ 1,569,004 $ 1,792,708
Actual Ratio (as a percent) 12.75% 15.31%
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 $ 1,705,098 $ 1,928,792
Actual Ratio (as a percent) 13.85% 16.48%
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 $ 1,569,004 $ 1,792,708
Actual Ratio 8.36% 9.84%
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 $ 1,533,056 $ 1,782,961
Actual Ratio (as a percent) 12.51% 15.24%
Tier 1 capital to risk-weighted assets    
Actual Amount $ 1,533,063 $ 1,782,968
Actual Ratio (as a percent) 12.51% 15.24%
Total capital to risk-weighted assets    
Actual Amount $ 1,669,157 $ 1,919,052
Actual Ratio (as a percent) 13.62% 16.40%
Tier 1 capital to average assets (leverage ratio)    
Actual Amount $ 1,533,063 $ 1,782,968
Actual Ratio 8.19% 9.80%