Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Cash and due from banks	$ 159,858	$ 144,507
Money market instruments	87,034	74,673
Cash and cash equivalents	246,892	219,180
Marketable Securities [Abstract]
Debt Securities, Available-for-sale, Current	1,757,147	1,754,140
Other Investments and Securities, at Cost	75,127	61,268
Total investment securities	1,832,274	1,815,408
Loan balance	6,821,606	6,871,122
Financing Receivable, Allowance for Credit Loss	(78,861)	(83,197)
Net loans	6,742,745	6,787,925
Bank owned life insurance	224,100	215,792
Prepaid assets	147,486	144,124
Goodwill	159,595	159,595
Other intangible assets	7,060	7,462
Premises and equipment, net	87,423	89,008
Affordable housing tax credit investments	56,731	58,711
Other real estate owned	760	775
Interest Receivable	23,054	23,413
Operating Lease, Right-of-Use Asset	12,797	13,446
Mortgage loan servicing rights	15,704	15,264
Other	19,731	10,151
Total assets	9,576,352	9,560,254
Liabilities and Shareholders' Equity:
Noninterest bearing	3,055,614	3,066,419
Interest bearing	4,940,704	4,838,109
Total deposits	7,996,318	7,904,528
Short-term borrowings	205,927	238,786
Subordinated debentures and notes	188,322	188,210
Unfunded commitments in affordable housing tax credit investments	21,232	28,484
Operating Lease, Liability	13,568	14,339
Off-Balance Sheet, Credit Loss, Liability	3,771	4,282
Accrued interest payable	1,147	3,116
Other	69,701	67,750
Total liabilities	8,499,986	8,449,495
Shareholders' equity:
Preferred shares (200,000 shares authorized; 0 shares issued)	0	0
Common shares (No par value; 20,000,000 shares authorized; 17,623,106 shares issued at March 31, 2022 and 17,623,118 shares issued at December 31, 2021)	459,271	461,800
Retained earnings	797,033	776,294
Treasury shares (1,373,798 shares at March 31, 2022 and 1,403,555 shares at December 31, 2021)	(139,469)	(142,490)
Accumulated other comprehensive (loss) income, net of taxes	(40,469)	15,155
Total shareholders' equity	1,076,366	1,110,759
Total liabilities and shareholders' equity	$ 9,576,352	$ 9,560,254