Income Taxes - Schedule of Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits that would impact effective tax rate	$ 900				$ 1,300				$ 900	$ 1,300	$ 800
Statutory federal income tax rate									35.00%	35.00%	35.00%
Increase (reduction) in income tax resulting from:
Income tax expense at statutory rate									$ 20,440	$ 14,365	$ 17,528
Tax-exempt income, net									(931)	(857)	(1,128)
State and local income taxes, net									1,414	741	1,314
Bank-owned life insurance, net									(462)	(535)	(484)
Non-deductible expenses									259	290	222
Change in estimated rate for deferred taxes									0	0	336
Tax benefits of LIHTC investments, net									(179)	(158)	(204)
Other, net									(590)	25	(608)
Total income tax expense	$ 5,445	$ 4,722	$ 4,762	$ 5,022	$ 2,812	$ 4,388	$ 3,664	$ 3,007	$ 19,951	$ 13,871	$ 16,976