Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest income
Loans, including fees	$ 291,355	$ 291,921	$ 252,393
Securities, taxable	17,544	9,917	7,611
Securities, tax-exempt	4,955	4,123	3,663
Interest-earning deposits	16,340	15,541	7,691
Total interest income	330,194	321,502	271,358
Interest expense
Deposits	102,510	101,395	55,444
Short-term borrowings	7,464	7,717	2,847
Federal Home Loan Bank advances	11,404	13,018	11,367
Subordinated debentures and other borrowings	7,772	8,286	8,155
Total interest expense	129,150	130,416	77,813
Net interest income	201,044	191,086	193,545
Provision for credit losses	3,200	7,400	7,700
Net interest income after provision for credit losses	197,844	183,686	185,845
Noninterest income:
Mortgage banking activities	13,021	12,301	7,595
Earnings on bank owned life insurance	3,293	2,555	1,500
Other income	2,523	3,602	2,725
Total noninterest income	41,608	40,389	32,143
Noninterest expense
Salaries and benefits	83,198	77,924	68,801
Data processing	15,273	13,772	11,618
Occupancy	8,511	8,643	9,150
Furniture and equipment rent, depreciation and maintenance	3,357	3,716	3,464
FDIC insurance costs	2,715	2,497	2,258
Advertising	1,664	1,604	1,565
Charitable foundation contributions	1,066	1,708	666
Acquisition costs	1,815	0	0
Other expense	18,360	15,925	17,767
Total noninterest expense	135,959	125,789	115,289
Income before federal income tax expense	103,493	98,286	102,699
Federal income tax expense	14,740	18,693	20,482
Net income	$ 88,753	$ 79,593	$ 82,217
Earnings per common share:
Basic (in dollars per share)	$ 5.47	$ 4.93	$ 5.13
Diluted (in dollars per share)	$ 5.47	$ 4.93	$ 5.13
Credit and Debit Card [Member]
Noninterest income:
Noninterest revenue	$ 9,207	$ 8,821	$ 8,914
Service Charges on Deposit and Sweep Accounts [Member]
Noninterest income:
Noninterest revenue	8,134	6,842	4,954
Payroll Processing [Member]
Noninterest income:
Noninterest revenue	3,473	3,058	2,509
Interest Rate Swap Fees [Member]
Noninterest income:
Noninterest revenue	$ 1,957	$ 3,210	$ 3,946