Parent Company - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Noninterest expense
Salaries and employee benefits	$ 175,351	$ 169,233	$ 170,233
Contracted services and professional fees	45,011	45,345	42,663
Equipment	17,247	16,912	15,836
Advertising and marketing	6,191	6,127	5,472
Other	41,999	42,626	41,245
Total noninterest expense	347,554	337,280	327,309
(Provision) benefit for income taxes	(184,673)	(141,651)	(129,447)
Net income	183,682	230,178	213,780
Comprehensive income	175,310	193,426	213,978
Parent Company
Income
Dividends from FHB	105,400	479,692	175,600
Other income	3,937	368
Total income	109,337	480,060	175,600
Noninterest expense
Salaries and employee benefits	5,949	6,820	10,930
Contracted services and professional fees	3,643	5,424	5,791
Equipment	55
Advertising and marketing	1	4
Other	570	999	2,076
Total noninterest expense	10,218	13,247	18,797
Income before (provision) benefit for income taxes and equity in undistributed income (excess distributions) of FHB	99,119	466,813	156,803
(Provision) benefit for income taxes	(642)	3,175	7,425
Equity in undistributed income (excess distributions) of FHB	85,205	(239,810)	49,552
Net income	183,682	230,178	213,780
Comprehensive income	$ 175,310	$ 193,426	$ 213,978