Parent Company - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income
Total revenue	$ 793,074	$ 715,475	$ 733,114
Noninterest expense
Salaries and employee benefits	199,129	182,384	174,221
Contracted services and professional fees	70,027	63,349	60,546
Equipment	34,506	24,719	20,277
Other	57,186	66,082	47,339
Total noninterest expense	440,471	405,479	367,672
Benefit for income taxes	(85,526)	(83,261)	(57,970)
Net income	265,685	265,735	185,754
Comprehensive (loss) income	(251,876)	112,438	249,107
First Hawaiian, Inc.
Income
Dividends from FHB	157,000	213,500	142,000
Other income			1,169
Total revenue	157,000	213,500	143,169
Noninterest expense
Salaries and employee benefits	4,098	3,732	3,660
Contracted services and professional fees	6,200	2,731	2,544
Equipment	78		31
Other	1,447	1,314	1,439
Total noninterest expense	11,823	7,777	7,674
Income before benefit for income taxes and equity in undistributed income of FHB	145,177	205,723	135,495
Benefit for income taxes	2,707	1,877	679
Equity in undistributed income of FHB	$ 117,801	$ 58,135	$ 49,580