Income Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Current Federal Tax Expense (Benefit)	$ 50,708	$ 44,094	$ 40,471
Current State and Local Tax Expense (Benefit)	9,610	7,822	6,359
Current tax (benefit) expense	60,318	51,916	46,830
Deferred Federal Income Tax Expense (Benefit)	(5,445)	(12,078)	60
Deferred State and Local Income Tax Expense (Benefit)	(1,184)	(1,690)	270
Deferred tax expense (benefit)	(6,629)	(13,768)	330
Income tax provision	53,689	38,148	47,160
Deferred tax assets:
Allowance for credit losses	39,378	36,906
Deferred Tax Assets, Lease Liability	15,973	15,823
Deferred compensation	14,887	11,658
Stock option and restricted stock	3,186	2,599
OREO	50	16
Nonaccrual interest	118	102
Deferred Tax Assets, Net operating losses and credit carryforwards	2,898	3,304
Other	(1,824)	(278)
Total deferred tax assets	78,314	70,686
Deferred tax liabilities:
Asset purchase tax basis difference	(5,052)	(6,590)
Deferred Tax Liabilities, Leasing Arrangements	(14,510)	(14,501)
FHLB stock dividends	(810)	(789)
Deferred loan fees	(5,957)	(5,695)
deferred tax liabilities, unrealized gains on available-for-sale securities	7,254	49,837
deferred tax liabilites, unrealized gains on equity securities	(3,231)	(3,147)
Deferred tax liabilities, purchase accounting	(14,211)	(7,526)
Depreciation	(3,304)	(2,427)
Deferred Tax Liabilities, Derivatives	(5,280)	(7,591)
Deferred Tax Liabilities, Other	(130)	(112)
Total deferred tax liabilities	59,739	98,215
Deferred Income Tax Asset, Net	18,575
Net deferred tax liability		(27,529)
Reconciliation of effective income tax rate with federal statutory tax rate
Income tax based on statutory rate	$ 53,867	$ 40,402	$ 50,738
Income tax based on statutory rate, percent	21.00%	21.00%	21.00%
Tax exempt instruments	$ (6,306)	$ (5,987)	$ (6,771)
Tax exempt instrument, percent	(2.00%)	(3.00%)	(3.00%)
Bank owned life insurance proceeds	$ (1,444)	$ (1,348)	$ (1,963)
Life insurance proceeds, percent	(1.00%)	(1.00%)	(1.00%)
State income tax, net of federal benefit	$ 7,892	$ 4,844	$ 5,134
State income tax, net of federal benefit, Percent	3.00%	3.00%	2.00%
Other, net	$ (320)	$ 237	$ 22
Other, net, percent	0.00%	0.00%	1.00%
Income tax provision	$ 53,689	$ 38,148	$ 47,160
Income tax provision (benefit), percent	21.00%	20.00%	20.00%