Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets:
Cash and due from banks	$ 134,182	$ 155,596
Money market instruments	673,242	214,878
Cash and cash equivalents	807,424	370,474
Marketable Securities [Abstract]
Debt Securities, Available-for-sale, Current	1,404,268	1,059,341
Other Investments and Securities, at Cost	57,648	65,465
Total investment securities	1,461,916	1,124,806
Loan balance	7,035,646	7,177,785
Financing Receivable, Allowance for Credit Loss	(83,577)	(85,675)
Net loans	6,952,069	7,092,110
Bank owned life insurance	218,128	216,225
Prepaid assets	115,010	103,523
Goodwill	159,595	159,595
Other intangible assets	8,302	9,260
Premises and equipment, net	89,570	88,660
Affordable housing tax credit investments	62,312	56,024
Other real estate owned	813	1,431
Interest Receivable	23,054	24,926
Operating Lease, Right-of-Use Asset	13,737	15,078
Mortgage loan servicing rights	14,316	12,210
Other	21,748	4,699
Total assets	9,947,994	9,279,021
Liabilities and Shareholders' Equity:
Noninterest bearing	2,876,110	2,727,100
Interest bearing	5,338,514	4,845,258
Total deposits	8,214,624	7,572,358
Short-term borrowings	285,861	342,230
Long-term debt	27,500	32,500
Subordinated debentures and notes	187,989	187,774
Unfunded commitments in affordable housing tax credit investments	33,204	29,298
Operating Lease, Liability	14,801	16,053
Off-Balance Sheet, Credit Loss, Liability	4,402	116
Accrued interest payable	3,392	3,860
Other	106,829	54,576
Total liabilities	8,878,602	8,238,765
Shareholders' equity:
Preferred shares (200,000 shares authorized; 0 shares issued)	0	0
Common shares (No par value; 20,000,000 shares authorized; 17,623,143 shares issued at June 30, 2021 and 17,623,163 shares issued at December 31, 2020)	459,276	460,687
Retained earnings	741,155	704,764
Treasury shares (1,282,371 shares at June 30, 2021 and 1,308,966 shares at December 31, 2020)	(128,109)	(130,766)
Accumulated other comprehensive (loss) income, net of taxes	(2,930)	5,571
Total shareholders' equity	1,069,392	1,040,256
Total liabilities and shareholders' equity	$ 9,947,994	$ 9,279,021