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Income Taxes - Schedule of Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (reduction) in income tax resulting from:
Income tax expense at statutory rate									$ 19,309	$ 24,368	$ 21,961
Tax-exempt interest income, net									(2,010)	(962)	(506)
State and local income taxes, net									3,254	2,816	2,423
Bank-owned life insurance, net									(778)	(628)	(452)
Non-deductible expenses									637	749	294
Tax benefit (expense) of LIHTC investments, net									(444)	(278)	(50)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount									(175)	(526)	(1,631)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount									(1,327)	(913)	(4,627)
Non-taxable subsidiary dividend									0	0	(2,728)
Non-taxable donation to charitable foundation									0	(420)	0
Other, net									(903)	(909)	676
Total income tax expense	$ 6,508	$ 4,428	$ 3,656	$ 2,971	$ 7,246	$ 7,469	$ 4,479	$ 4,103	$ 17,563	$ 23,297	$ 15,360

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