Parent Company - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 284,392	$ 264,394	$ 183,682
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes	17,060	(3,602)	58,916
Stock-based compensation	7,826	6,185	5,292
Change in assets and liabilities:
Net decrease (increase) in other assets	(20,923)	11,859	(42,359)
Net decrease in other liabilities	(76,303)	(27,090)	(9,128)
Net cash provided by operating activities	296,504	351,413	269,774
Cash flows from investing activities
Other, net		(2,832)	(2,044)
Net cash provided by investing activities	375,212	(257,809)	(971,081)
Cash flows from financing activities
Dividends paid	(138,246)	(131,036)	(122,810)
Distributions paid			(2,118)
Stock tendered for payment of withholding taxes	(1,764)	(53)	(136)
Proceeds from employee stock purchase plan		342	528
Common stock repurchased	(136,242)	(131,800)
Net cash (used in) provided by financing activities	(981,336)	(124,611)	683,893
Net decrease in cash and cash equivalents	(309,620)	(31,007)	(17,414)
Cash and cash equivalents at beginning of period	1,003,637	1,034,644	1,052,058
Cash and cash equivalents at end of period	694,017	1,003,637	1,034,644
Parent Company
Cash flows from operating activities
Net income	284,392	264,394	183,682
Adjustments to reconcile net income to net cash provided by operating activities:
(Equity in undistributed income) excess distributions of FHB	10,620	(8,752)	(85,205)
Deferred income taxes	85	(48)	(274)
Stock-based compensation	84	281	244
Change in assets and liabilities:
Net decrease (increase) in other assets	5,318	(9,635)	36,467
Net decrease in other liabilities	(5,439)	7,633	(2,058)
Net cash provided by operating activities	295,060	253,873	132,856
Cash flows from investing activities
Other, net			7
Net cash provided by investing activities			7
Cash flows from financing activities
Dividends paid	(138,246)	(131,036)	(122,810)
Distributions paid			(2,118)
Stock tendered for payment of withholding taxes	(1,764)	(69)	(120)
Proceeds from employee stock purchase plan		342	528
Common stock repurchased	(136,242)	(131,800)
Net cash (used in) provided by financing activities	(276,252)	(262,563)	(124,520)
Net decrease in cash and cash equivalents	18,808	(8,690)	8,343
Cash and cash equivalents at beginning of period	5,647	14,337	5,994
Cash and cash equivalents at end of period	$ 24,455	$ 5,647	$ 14,337