CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME:
Loans, including related fees	$ 146,295	$ 128,000	$ 137,241
Securities:
Taxable	21,014	13,110	12,979
Tax-exempt	9,974	8,762	7,952
Other	6,018	2,326	2,313
TOTAL INTEREST INCOME	183,301	152,198	160,485
INTEREST EXPENSE:
Deposits	16,743	8,158	12,801
Short-term borrowings	1,243	387	568
Other borrowings	273	252	770
TOTAL INTEREST EXPENSE	18,259	8,797	14,139
NET INTEREST INCOME	165,042	143,401	146,346
Provision for credit losses	(2,025)	2,466	10,528
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	167,067	140,935	135,818
NON-INTEREST INCOME:
Trust and financial services	5,155	5,255	4,838
Service charges and fees on deposit accounts	27,540	24,700	21,809
Other service charges and fees	665	1,163	1,888
Securities gains, net	3	114	233
Interchange income	559	438	344
Loan servicing fees	1,554	1,849	1,715
Gain on sales of mortgage loans	1,994	5,003	6,626
Other	9,246	3,562	5,023
TOTAL NON-INTEREST INCOME	46,716	42,084	42,476
NON-INTEREST EXPENSE:
Salaries and employee benefits	65,555	64,474	61,931
Occupancy expense	9,764	8,774	8,202
Equipment expense	12,391	10,174	10,568
FDIC Expense	2,327	1,294	316
Other	35,986	32,690	31,741
TOTAL NON-INTEREST EXPENSE	126,023	117,406	112,758
INCOME BEFORE INCOME TAXES	87,760	65,613	65,536
Provision for income taxes	16,651	12,626	11,692
NET INCOME	71,109	52,987	53,844
OTHER COMPREHENSIVE INCOME (LOSS)
Change in unrealized gains/(losses) on securities, net of reclassifications and taxes	(144,570)	(18,488)	19,269
Change in funded status of post retirement benefits, net of taxes	7,022	6,298	(2,004)
COMPREHENSIVE INCOME (LOSS)	$ (66,439)	$ 40,797	$ 71,109
PER SHARE DATA
Basic Earnings per Share (in dollars per share)	$ 5.82	$ 4.02	$ 3.93
Diluted Earnings per Share (in dollars per share)	$ 5.82	$ 4.02	$ 3.93
Weighted average number of shares outstanding, basic (in shares)	12,211	13,190	13,716
Weighted average number of shares outstanding, diluted (in shares)	12,211	13,190	13,716