Consolidated Condensed Statements Of Income - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest and dividend income:
Interest and fees on loans	$ 91,614,000	$ 72,416,000
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	12,979,000	6,130,000
Interest Income, Securities, State and Municipal	2,912,000	2,447,000
Other interest income	3,396,000	153,000
Total interest and dividend income	110,901,000	81,146,000
Interest on deposits:
Demand and savings deposits	14,212,000	351,000
Time deposits	1,347,000	720,000
Interest on borrowings:
Short-term borrowings	824,000	244,000
Long-term debt	2,320,000	2,145,000
Total interest expense	18,703,000	3,460,000
Net interest income	92,198,000	77,686,000
Provision for (recovery of) credit losses	183,000	(4,605,000)
Net interest income after provision for credit losses	92,015,000	82,291,000
Noninterest Income [Abstract]
Debit card fee income	6,457,000	6,126,000
Bank owned life insurance income	1,185,000	1,175,000
ATM Fees	533,000	532,000
Gains (Losses) on Sales of Other Real Estate	(9,000)	0
Real Estate Owned, Valuation Allowance, Valuation Increase	15,000	30,000
Loss (gain) on equity securities, net	(405,000)	2,353,000
Other components of net periodic benefit income	1,893,000	3,027,000
Other	1,165,000	2,723,000
Total other income	24,387,000	31,656,000
Other expense:
Salaries and employee benefits	34,871,000	30,521,000
Employee Benefits and Share-based Compensation	10,816,000	10,499,000
Occupancy expense	3,353,000	3,214,000
Furniture and equipment expense	3,246,000	2,937,000
Data processing fees	8,750,000	7,504,000
Professional fees and services	7,221,000	5,858,000
Marketing	1,319,000	1,317,000
Insurance	1,814,000	1,405,000
Communication	1,037,000	890,000
Excise and Sales Taxes	1,278,000	1,192,000
Amortization of Intangible Assets	327,000	402,000
Other expense	2,471,000	1,634,000
Total other expense	76,503,000	67,373,000
Income before income taxes	39,899,000	46,574,000
Income taxes	6,166,000	7,699,000
Net income	$ 33,733,000	$ 38,875,000
Net income available to common shareholders
Basic	$ 2.08	$ 2.40
Diluted	$ 2.07	$ 2.38
Weighted average common shares outstanding
Basic	16,242,353	16,219,889
Diluted	16,324,823	16,331,031
Quarterly Dividend
Weighted average common shares outstanding
Cash dividends declared	$ 1.05	$ 1.04
Fiduciary and Trust [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 8,615,000	$ 8,797,000
Deposit Account [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	2,241,000	2,074,000
Bank Servicing [Member]
Noninterest Income [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,697,000	$ 4,819,000