CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME/(LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
INTEREST INCOME:
Loans, including related fees	$ 189,641	$ 146,295	$ 128,000
Securities:
Taxable	24,643	21,014	13,110
Tax-exempt	10,573	9,974	8,762
Other	3,540	6,018	2,326
TOTAL INTEREST INCOME	228,397	183,301	152,198
INTEREST EXPENSE:
Deposits	51,694	16,743	8,158
Short-term borrowings	5,370	1,243	387
Other borrowings	4,071	273	252
TOTAL INTEREST EXPENSE	61,135	18,259	8,797
NET INTEREST INCOME	167,262	165,042	143,401
Provision for credit losses	7,295	(2,025)	2,466
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	159,967	167,067	140,935
NON-INTEREST INCOME:
Trust and financial services	5,155	5,155	5,255
Service charges and fees on deposit accounts	28,079	27,540	24,700
Other service charges and fees	801	665	1,163
Securities gains/(losses), net	(1)	3	114
Interchange income	676	559	438
Loan servicing fees	1,176	1,554	1,849
Gain on sales of mortgage loans	966	1,994	5,003
Other	5,850	9,246	3,562
TOTAL NON-INTEREST INCOME	42,702	46,716	42,084
NON-INTEREST EXPENSE:
Salaries and employee benefits	68,525	65,555	64,474
Occupancy expense	9,351	9,764	8,774
Equipment expense	14,020	12,391	10,174
FDIC Expense	2,907	2,327	1,294
Other	35,373	35,986	32,690
TOTAL NON-INTEREST EXPENSE	130,176	126,023	117,406
INCOME BEFORE INCOME TAXES	72,493	87,760	65,613
Provision for income taxes	11,821	16,651	12,626
NET INCOME	60,672	71,109	52,987
OTHER COMPREHENSIVE INCOME (LOSS)
Change in unrealized gains/(losses) on securities, net of reclassifications and taxes	10,896	(144,570)	(18,488)
Change in funded status of post retirement benefits, net of taxes	1,991	7,022	6,298
COMPREHENSIVE INCOME (LOSS)	$ 73,559	$ (66,439)	$ 40,797
PER SHARE DATA
Basic Earnings per Share (in dollars per share)	$ 5.08	$ 5.82	$ 4.02
Diluted Earnings per Share (in dollars per share)	$ 5.08	$ 5.82	$ 4.02
Weighted average number of shares outstanding, basic (in shares)	11,937	12,211	13,190
Weighted average number of shares outstanding, diluted (in shares)	11,937	12,211	13,190