Consolidated Condensed Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets:
Cash and due from banks	$ 141,020	$ 129,078
Money market instruments	55,946	17,952
Cash and cash equivalents	196,966	147,030
Investment securities:
Securities available-for-sale, at fair value (amortized cost of $1,206,219 and $1,222,143 at June 30, 2014 and December 31, 2013)	1,197,295	1,176,266
Securities held-to-maturity, at amortized cost (fair value of $165,786 and $187,402 at June 30, 2014 and December 31, 2013)	162,304	182,061
Other investment securities	58,311	65,907
Total investment securities	1,417,910	1,424,234
Loans	4,735,487	4,620,505
Allowance for loan losses	(57,911)	(59,468)
Net loans	4,677,576	4,561,037
Bank owned life insurance	170,828	169,284
Goodwill	72,334	72,334
Premises and equipment, net	54,884	55,278
Other real estate owned	23,909	34,636
Interest Receivable	17,838	18,335
Mortgage loan servicing rights	8,662	9,013
Other	148,266	147,166
Total assets	6,789,173	6,638,347
Liabilities and Shareholders' Equity:
Noninterest bearing	1,163,288	1,193,553
Interest bearing	3,763,923	3,596,441
Total deposits	4,927,211	4,789,994
Short-term borrowings	250,689	242,029
Long-term debt	787,465	810,541
Subordinated debentures and notes	80,250	80,250
Accrued interest payable	2,749	2,901
Other	53,838	60,885
Total liabilities	6,102,202	5,986,600
Shareholders' equity:
Preferred shares (200,000 shares authorized; 0 shares issued)	0	0
Common shares (No par value; 20,000,000 shares authorized; 16,150,914 shares issued at June 30, 2014 and 16,150,941 shares issued at December 31, 2013)	302,869	302,651
Retained earnings	473,114	460,643
Treasury shares (758,489 shares at June 30, 2014 and 738,989 at December 31, 2013)	(77,613)	(76,128)
Accumulated other comprehensive loss, net of taxes	(11,399)	(35,419)
Total shareholders' equity	686,971	651,747
Total liabilities and shareholders' equity	$ 6,789,173	$ 6,638,347