Parent Company - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 1,052,058	$ 2,650,195	$ 1,261,453	$ 1,809,407
Other assets	362,775	307,730
Total assets	19,661,829	19,352,681	18,133,696
Liabilities and Stockholders' Equity
Retirement benefits payable	132,904	133,910
Other liabilities	248,716	203,707
Total liabilities	17,185,344	16,615,740
Stockholders' equity
Stockholders' equity	2,476,485	2,736,941	2,675,040	2,651,111
Total liabilities and stockholders' equity	19,661,829	19,352,681
First Hawaiian, Inc.
Assets
Cash and cash equivalents	5,994	10,000	$ 10,000	$ 10,000
Investment in FHB	2,440,596	2,726,941
Other assets	50,831
Total assets	2,497,421	2,736,941
Liabilities and Stockholders' Equity
Retirement benefits payable	736
Other liabilities	20,200
Total liabilities	20,936
Stockholders' equity
Stockholders' equity	2,476,485	2,736,941
Total liabilities and stockholders' equity	$ 2,497,421	$ 2,736,941