Income Taxes (Details 2) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reasons for the difference between income tax expense and statutory federal income tax
Statutory federal income tax	$ 33,953,000	$ 32,925,000	$ 32,526,000
Tax-exempt interest income	(592,000)	(504,000)	(373,000)
State taxes, net of federal income tax benefit	3,626,000	4,275,000	4,563,000
Other	(241,000)	(441,000)	(388,000)
Total provision	$ 36,746,000	$ 36,255,000	$ 36,328,000
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)	(0.40%)	(0.30%)	(0.20%)
State taxes, net of federal income tax benefit (as a percent)	2.20%	2.70%	2.90%
Other (as a percent)	(0.10%)	(0.30%)	(0.20%)
Total income tax expense (benefit) (as a percent)	22.70%	23.10%	23.50%
Deferred tax assets:
Reserve for loan and lease losses	$ 34,957,000	$ 33,237,000
Operating lease liability	4,675,000	4,728,000
Accruals for employee benefits	4,103,000	3,752,000
Capitalized loan costs	1,658,000	0
Net unrealized losses on securities available-for-sale	33,433,000	46,353,000
Other	2,405,000	426,000
Total deferred tax assets	81,231,000	88,496,000
Deferred tax liabilities:
Differing depreciable bases in premises and leased equipment	5,198,000	7,373,000
Right of use assets - leases	5,224,000	5,037,000
Differing bases in assets related to acquisitions	4,308,000	4,305,000
Tax advantaged partnerships	0	3,823,000
Other	2,246,000	245,000
Total deferred tax liabilities	16,976,000	20,783,000
Deferred Tax Assets, Net, Total	64,255,000	67,713,000
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	$ (720,000)	$ (39,000)	$ (164,000)