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Income Taxes - Schedule of Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Increase (reduction) in income tax resulting from:
Income tax expense at statutory rate									$ 26,194	$ 20,440	$ 14,365
Tax-exempt income, net									(945)	(931)	(857)
State and local income taxes, net									1,673	1,414	741
Bank-owned life insurance, net									(544)	(462)	(535)
Non-deductible expenses									263	259	290
Change in estimated rate for deferred taxes									302	0	0
Tax benefits of LIHTC investments, net									(181)	(179)	(158)
Other, net									(760)	(590)	25
Total income tax expense	$ 7,053	$ 6,316	$ 6,747	$ 5,886	$ 5,445	$ 4,722	$ 4,762	$ 5,022	$ 26,002	$ 19,951	$ 13,871

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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