Parent Company - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income	$ 264,394	$ 183,682	$ 230,178
Adjustments to reconcile net income to net cash provided by operating activities:
Deferred income taxes	(3,602)	58,916	3,318
Stock-based compensation	6,185	5,292	4,507
Change in assets and liabilities:
Net decrease (increase) in other assets	11,859	(42,359)	(49,571)
Net decrease in other liabilities	(27,090)	(9,128)	(1,787)
Net cash provided by operating activities	351,413	269,774	220,093
Cash flows from investing activities
Other, net	(2,832)	(2,044)	94
Net cash provided by investing activities	(257,809)	(971,081)	(1,896,685)
Cash flows from financing activities
Dividends paid	(131,036)	(122,810)	(85,797)
Distributions paid		(2,118)	(361,200)
Stock tendered for payment of withholding taxes	(53)	(136)	(146)
Proceeds from employee stock purchase plan	342	528
Common stock repurchased	131,800
Net cash (used in) provided by financing activities	(124,611)	683,893	78,455
Net (decrease) increase in cash and cash equivalents	(31,007)	(17,414)	(1,598,137)
Cash and cash equivalents at beginning of period	1,034,644	1,052,058	2,650,195
Cash and cash equivalents at end of period	1,003,637	1,034,644	1,052,058
Parent Company
Cash flows from operating activities
Net income	264,394	183,682	230,178
Adjustments to reconcile net income to net cash provided by operating activities:
(Equity in undistributed income) excess distributions of FHB	(8,752)	(85,205)	239,810
Deferred income taxes	(48)	(274)	191
Stock-based compensation	281	244	55
Change in assets and liabilities:
Net decrease (increase) in other assets	(9,635)	36,467	(18,729)
Net decrease in other liabilities	7,633	(2,058)	(8,368)
Net cash provided by operating activities	253,873	132,856	443,137
Cash flows from investing activities
Other, net		7
Net cash provided by investing activities		7
Cash flows from financing activities
Dividends paid	(131,036)	(122,810)	(85,797)
Distributions paid		(2,118)	(361,200)
Stock tendered for payment of withholding taxes	(69)	(120)	(146)
Proceeds from employee stock purchase plan	342	528
Common stock repurchased	(131,800)
Net cash (used in) provided by financing activities	(262,563)	(124,520)	(447,143)
Net (decrease) increase in cash and cash equivalents	(8,690)	8,343	(4,006)
Cash and cash equivalents at beginning of period	14,337	5,994	10,000
Cash and cash equivalents at end of period	$ 5,647	$ 14,337	$ 5,994