Parent Company - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income
Total revenue	$ 765,935	$ 745,311
Noninterest expense
Salaries and employee benefits	173,098	167,162	$ 163,086
Contracted services and professional fees	56,321	49,775	45,011
Equipment	17,343	17,714	17,247
Advertising and marketing	6,910	4,813	6,191
Other	50,661	59,082	54,264
Total noninterest expense	370,437	364,953	347,554
Benefit (provision) for income taxes	(97,306)	(93,784)	(184,673)
Net income (loss)	284,392	264,394	183,682
Comprehensive income	384,838	248,650	175,310
Parent Company
Income
Dividends from FHB	300,300	263,400	105,400
Other income	1,691	1,541	3,937
Total revenue	301,991	264,941	109,337
Noninterest expense
Salaries and employee benefits	5,241	5,940	5,949
Contracted services and professional fees	2,689	3,780	3,643
Equipment		31	55
Advertising and marketing			1
Other	721	732	570
Total noninterest expense	8,651	10,483	10,218
Income before benefit (provision) for income taxes and (excess distributions) equity in undistributed income of FHB	293,340	254,458	99,119
Benefit (provision) for income taxes	1,672	1,184	(642)
(Excess distributions) equity in undistributed income of FHB	(10,620)	8,752	85,205
Net income (loss)	284,392	264,394	183,682
Comprehensive income	$ 384,838	$ 248,650	$ 175,310