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Income Taxes (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reasons for the difference between income tax expense and statutory federal income tax
Statutory federal income tax	$ 32,526,000	$ 22,332,000	$ 25,232,000
Tax-exempt interest income	(373,000)	(439,000)	(552,000)
State taxes, net of federal income tax benefit	4,563,000	3,424,000	4,064,000
Other	(388,000)	(437,000)	(605,000)
Total provision	$ 36,328,000	$ 24,880,000	$ 28,139,000
Reasons for the difference between income tax expense rate and statutory federal income tax rate
Statutory federal income tax (as a percent)	21.00%	21.00%	21.00%
Tax-exempt interest income (as a percent)	(0.20%)	(0.40%)	(0.50%)
State taxes, net of federal income tax benefit (as a percent)	2.90%	3.20%	3.40%
Other (as a percent)	(0.20%)	(0.40%)	(0.50%)
Total income tax expense (benefit) (as a percent)	23.50%	23.40%	23.40%
Deferred tax assets:
Reserve for loan and lease losses	$ 32,431,000	$ 35,696,000
Deferred Tax Assets, Tax Credit Carryforwards, Other	0	8,606,000
Operating lease liability	5,145,000	5,704,000
Accruals for employee benefits	3,837,000	2,963,000
Capitalized loan costs	15,000	893,000
Net unrealized losses on securities available-for-sale	3,128,000	0
Other	1,015,000	851,000
Total deferred tax assets	45,571,000	54,713,000
Deferred tax liabilities:
Differing depreciable bases in premises and leased equipment	10,796,000	13,118,000
Right of use assets - leases	5,315,000	5,737,000
Differing bases in assets related to acquisitions	4,219,000	4,160,000
Tax advantaged partnerships	9,502,000	3,770,000
Net unrealized gains on securities available-for-sale	0	5,827,000
Other	713,000	634,000
Total deferred tax liabilities	30,545,000	33,246,000
Deferred Tax Assets, Net, Total	15,026,000	21,467,000
Valuation allowance for deferred tax assets	0	0
Investment securities available-for-sale
Reasons for the difference between income tax expense and statutory federal income tax
Total provision	$ (164,000)	$ 67,000	$ 0

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