Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Expected income tax expense at statutory federal rate	$ 39,290	$ 41,256	$ 42,768
State and local taxes, net of federal tax effect	6,038	(9,220)	(12,096)
Tax exempt income (principally on BOLI)	(3,213)	(3,107)	(2,970)
Low income housing tax credit	(916)	(1,036)	(1,676)
Other, net	(471)	1,906	253
Total income tax expense	$ 40,728	$ 29,799	$ 26,279