Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Cash and due from banks	$ 145,062	$ 135,567
Money market instruments	175,858	24,389
Cash and cash equivalents	320,920	159,956
Marketable Securities [Abstract]
Debt Securities, Available-for-sale, Current	1,184,399	1,209,701
Other Investments and Securities, at Cost	68,688	69,806
Total investment securities	1,253,087	1,279,507
Loan balance	6,522,519	6,501,404
Allowance for loan losses	(61,503)	(56,679)
Net loans	6,461,016	6,444,725
Bank owned life insurance	213,776	212,529
Prepaid assets	107,042	101,990
Goodwill	159,595	159,595
Other intangible assets	10,917	11,523
Premises and equipment, net	77,330	73,322
Affordable housing tax credit investments	51,241	53,070
Other real estate owned	3,600	4,029
Interest Receivable	23,406	24,217
Operating Lease, Right-of-Use Asset	20,737	13,714
Mortgage loan servicing rights	8,768	10,070
Other	7,856	10,130
Total assets	8,719,291	8,558,377
Liabilities and Shareholders' Equity:
Noninterest bearing	1,976,565	1,959,935
Interest bearing	5,313,568	5,092,677
Total deposits	7,290,133	7,052,612
Short-term borrowings	193,373	230,657
Long-term debt	140,000	192,500
Subordinated debentures and notes	15,000	15,000
Unfunded commitments in affordable housing tax credit investments	23,348	25,894
Operating Lease, Liability	21,482	14,482
Accrued interest payable	2,830	2,927
Other	51,248	55,291
Total liabilities	7,737,414	7,589,363
Shareholders' equity:
Preferred shares (200,000 shares authorized; 0 shares issued)	0	0
Common shares (No par value; 20,000,000 shares authorized; 17,623,190 shares issued at March 31, 2020 and 17,623,199 shares issued at December 31, 2019)	456,777	459,389
Retained earnings	649,636	646,847
Treasury shares (1,327,729 shares at March 31, 2020 and 1,276,757 shares at December 31, 2019)	(132,640)	(127,633)
Accumulated other comprehensive income (loss), net of taxes	8,104	(9,589)
Total shareholders' equity	981,877	969,014
Total liabilities and shareholders' equity	$ 8,719,291	$ 8,558,377