Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income
Loans, including fees	$ 253,108	$ 166,848	$ 135,048
Securities, taxable	9,041	7,603	5,127
Securities, tax-exempt	3,663	2,734	2,386
Other interest-earning assets	5,546	4,654	933
Total interest income	271,358	181,839	143,494
Interest expense
Deposits	55,444	10,037	9,114
Short-term borrowings	2,847	294	170
Federal Home Loan Bank advances	11,367	7,125	8,177
Subordinated debentures and other borrowings	8,155	6,139	1,971
Total interest expense	77,813	23,595	19,432
Net interest income	193,545	158,244	124,062
Provision (benefit) for credit losses	7,700	6,550	(4,300)
Net interest income after provision for credit losses	185,845	151,694	128,362
Noninterest income:
Mortgage banking activities	7,595	8,664	29,959
Interest rate swap program fees	3,946	3,488	6,862
Payroll processing	2,509	2,178	1,815
Earnings on bank owned life insurance	1,500	1,678	1,164
Gain on sale of branch	0	0	1,058
Other income	2,725	1,901	2,768
Total noninterest income	32,143	32,077	56,220
Noninterest expense
Salaries and benefits	68,801	65,124	66,447
Occupancy	9,150	8,362	8,088
Furniture and equipment rent, depreciation and maintenance	3,464	3,614	3,654
Data processing	11,618	12,359	11,104
Advertising	1,565	1,445	1,175
FDIC insurance costs	2,258	1,239	1,820
Charitable foundation contributions	666	1,514	4,020
Other expense	17,767	14,324	14,558
Total noninterest expense	115,289	107,981	110,866
Income before federal income tax expense	102,699	75,790	73,716
Federal income tax expense	20,482	14,727	14,695
Net income	$ 82,217	$ 61,063	$ 59,021
Earnings per common share:
Basic (in dollars per share)	$ 5.13	$ 3.85	$ 3.69
Diluted (in dollars per share)	$ 5.13	$ 3.85	$ 3.69
Service Charges on Deposit and Sweep Accounts [Member]
Noninterest income:
Noninterest revenue	$ 4,954	$ 5,952	$ 5,078
Credit and Debit Card [Member]
Noninterest income:
Noninterest revenue	$ 8,914	$ 8,216	$ 7,516