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Regulatory Capital Requirements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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 $ 1,633,442 $ 1,569,004
Actual Ratio (as a percent) 12.45% 12.75%
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 $ 1,633,442 $ 1,569,004
Actual Ratio (as a percent) 12.45% 12.75%
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 $ 1,771,295 $ 1,705,098
Actual Ratio (as a percent) 13.50% 13.85%
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 $ 1,633,442 $ 1,569,004
Actual Ratio 8.52% 8.36%
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 $ 1,623,455 $ 1,533,056
Actual Ratio (as a percent) 12.37% 12.51%
Tier 1 capital to risk-weighted assets    
Actual Amount $ 1,623,455 $ 1,533,063
Actual Ratio (as a percent) 12.37% 12.51%
Total capital to risk-weighted assets    
Actual Amount $ 1,761,308 $ 1,669,157
Actual Ratio (as a percent) 13.42% 13.62%
Tier 1 capital to average assets (leverage ratio)    
Actual Amount $ 1,623,455 $ 1,533,063
Actual Ratio 8.47% 8.19%