Parent Company - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Total revenue	$ 733,114	$ 765,935	$ 745,311
Noninterest expense
Salaries and employee benefits	174,221	173,098	167,162
Contracted services and professional fees	60,546	56,321	49,775
Equipment	20,277	17,343	17,714
Other	47,339	50,661	59,082
Total noninterest expense	367,672	370,437	364,953
Benefit (provision) for income taxes	(57,970)	(97,306)	(93,784)
Net income (loss)	185,754	284,392	264,394
Comprehensive income	249,107	384,838	248,650
Parent Company.
Income
Dividends from FHB	142,000	300,300	263,400
Other income	1,169	1,691	1,541
Total revenue	143,169	301,991	264,941
Noninterest expense
Salaries and employee benefits	3,660	5,241	5,940
Contracted services and professional fees	2,544	2,689	3,780
Equipment	31		31
Other	1,439	721	732
Total noninterest expense	7,674	8,651	10,483
Income before benefit for income taxes and equity in undistributed income (excess distributions) of FHB	135,495	293,340	254,458
Benefit (provision) for income taxes	679	1,672	1,184
Equity in undistributed income (excess distributions) of FHB	$ 49,580	$ (10,620)	$ 8,752