Consolidated Condensed Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Assets:
Cash and due from banks	$ 171,114,000	$ 144,507,000
Money market instruments	75,327,000	74,673,000
Cash and cash equivalents	246,441,000	219,180,000
Marketable Securities [Abstract]
Debt Securities, Available-for-sale, Current	1,839,103,000	1,754,140,000
Other Investments and Securities, at Cost	81,621,000	61,268,000
Total investment securities	1,920,724,000	1,815,408,000
Financing Receivable, Held-for-Sale	6,321,000	0
Loan balance	6,958,685,000	6,871,122,000
Financing Receivable, Allowance for Credit Loss	(81,448,000)	(83,197,000)
Net loans	6,877,237,000	6,787,925,000
Bank owned life insurance	219,579,000	215,792,000
Prepaid assets	152,573,000	144,124,000
Goodwill	159,595,000	159,595,000
Other intangible assets	6,657,000	7,462,000
Premises and equipment, net	85,531,000	89,008,000
Affordable housing tax credit investments	54,751,000	58,711,000
Other real estate owned	1,354,000	775,000
Interest Receivable	26,457,000	23,413,000
Operating Lease, Right-of-Use Asset	16,314,000	13,446,000
Servicing Asset	16,470,000	15,264,000
Other	36,666,000	10,151,000
Total assets	9,826,670,000	9,560,254,000
Liabilities and Shareholders' Equity:
Noninterest bearing	3,057,977,000	3,066,419,000
Interest bearing	5,239,677,000	4,838,109,000
Total deposits	8,297,654,000	7,904,528,000
Short-term borrowings	171,799,000	238,786,000
Subordinated debentures and notes	188,435,000	188,210,000
Unfunded commitments in affordable housing tax credit investments	21,232,000	28,484,000
Operating Lease, Liability	17,067,000	14,339,000
Off-Balance Sheet, Credit Loss, Liability	4,131,000	4,282,000
Accrued interest payable	3,080,000	3,116,000
Other	73,259,000	67,750,000
Total liabilities	8,776,657,000	8,449,495,000
Shareholders' equity:
Preferred shares (200,000 shares authorized; No shares issued)	0	0
Common shares (No par value; 20,000,000 shares authorized; 17,623,104 shares issued at June 30, 2022 and 17,623,118 shares issued at December 31, 2021)	460,645,000	461,800,000
Retained earnings	814,241,000	776,294,000
Treasury shares (1,373,798 shares at June 30, 2022 and 1,403,555 shares at December 31, 2021)	(139,469,000)	(142,490,000)
Accumulated other comprehensive (loss) income, net of taxes	(85,404,000)	15,155,000
Total shareholders' equity	1,050,013,000	1,110,759,000
Total liabilities and shareholders' equity	$ 9,826,670,000	$ 9,560,254,000