Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Unsettled Investment Commitments	$ 52,508	$ 0
Assets:
Cash and due from banks	127,685	155,596
Money market instruments	749,710	214,878
Cash and cash equivalents	877,395	370,474
Marketable Securities [Abstract]
Debt Securities, Available-for-sale, Current	1,553,218	1,059,341
Other Investments and Securities, at Cost	56,085	65,465
Total investment securities	1,609,303	1,124,806
Loan balance	6,908,417	7,177,785
Financing Receivable, Allowance for Credit Loss	(88,129)	(85,675)
Net loans	6,820,288	7,092,110
Bank owned life insurance	215,401	216,225
Prepaid assets	116,228	103,523
Goodwill	159,595	159,595
Other intangible assets	7,882	9,260
Premises and equipment, net	88,909	88,660
Affordable housing tax credit investments	60,457	56,024
Other real estate owned	813	1,431
Interest Receivable	23,628	24,926
Operating Lease, Right-of-Use Asset	13,426	15,078
Mortgage loan servicing rights	14,556	12,210
Other	26,137	4,699
Total assets	10,034,018	9,279,021
Liabilities and Shareholders' Equity:
Noninterest bearing	2,981,928	2,727,100
Interest bearing	5,382,457	4,845,258
Total deposits	8,364,385	7,572,358
Short-term borrowings	235,979	342,230
Long-term debt	0	32,500
Subordinated debentures and notes	188,099	187,774
Unfunded commitments in affordable housing tax credit investments	33,116	29,298
Operating Lease, Liability	14,480	16,053
Off-Balance Sheet, Credit Loss, Liability	4,642	116
Accrued interest payable	1,330	3,860
Other	71,567	54,576
Total liabilities	8,966,106	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; 17,623,132 shares issued at September 30, 2021 and 17,623,163 shares issued at December 31, 2020)	459,953	460,687
Retained earnings	759,619	704,764
Treasury shares (1,416,955 shares at September 30, 2021 and 1,308,966 shares at December 31, 2020)	(143,850)	(130,766)
Accumulated other comprehensive (loss) income, net of taxes	(7,810)	5,571
Total shareholders' equity	1,067,912	1,040,256
Total liabilities and shareholders' equity	$ 10,034,018	$ 9,279,021