Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Cash and due from banks	$ 110,163	$ 131,946
Money market instruments	166,418	37,166
Cash and cash equivalents	276,581	169,112
Investment securities:
Debt securities available-for-sale, at fair value (amortized cost of $1,079,745 and $1,097,645 at March 31, 2018 and December 31, 2017, respectively)	1,046,910	1,091,881
Debt securities held-to-maturity, at amortized cost (fair value of $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively)	347,622	357,197
Other Marketable Securities, Noncurrent	69,824	63,746
Total investment securities	1,464,356	1,512,824
Loan balance	5,292,349	5,372,483
Allowance for loan losses	(48,969)	(49,988)
Net loans	5,243,380	5,322,495
Bank owned life insurance	188,952	189,322
Prepaid assets	101,635	97,712
Goodwill	72,334	72,334
Premises and equipment, net	56,239	55,901
Affordable housing tax credit investments	47,818	49,669
Other real estate owned	9,055	14,190
Interest Receivable	20,369	22,164
Mortgage loan servicing rights	9,969	9,688
Other	28,282	22,209
Total assets	7,518,970	7,537,620
Liabilities and Shareholders' Equity:
Noninterest bearing	1,618,200	1,633,941
Interest bearing	4,466,094	4,183,385
Total deposits	6,084,294	5,817,326
Short-term borrowings	184,090	391,289
Long-term debt	425,000	500,000
Subordinated debentures and notes	15,000	15,000
Unfunded commitments in affordable housing tax credit investments	14,282	14,282
Accrued interest payable	2,024	2,278
Other	41,506	41,344
Total liabilities	6,766,196	6,781,519
Shareholders' equity:
Preferred shares (200,000 shares authorized; 0 shares issued)	0	0
Common shares (No par value; 20,000,000 shares authorized; 16,150,740 shares issued at March 31, 2018 and 16,150,752 shares issued at December 31, 2017)	307,249	307,726
Retained earnings	583,941	561,908
Treasury shares (849,637 shares at March 31, 2018 and 862,558 at December 31, 2017)	(85,775)	(87,079)
Accumulated other comprehensive loss, net of taxes	(52,641)	(26,454)
Total shareholders' equity	752,774	756,101
Total liabilities and shareholders' equity	$ 7,518,970	$ 7,537,620