Consolidated Condensed Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets:
Cash and due from banks	$ 101,760	$ 129,078
Money market instruments	201,526	17,952
Cash and cash equivalents	303,286	147,030
Investment securities:
Securities available-for-sale, at fair value (amortized cost of $1,277,358 and $1,222,143 at September 30, 2014 and December 31, 2013)	1,263,965	1,176,266
Securities held-to-maturity, at amortized cost (fair value of $152,986 and $187,402 at September 30, 2014 and December 31, 2013)	150,349	182,061
Other investment securities	58,311	65,907
Total investment securities	1,472,625	1,424,234
Loans held for sale - lower of cost or market	28,606	1,666
Loans	4,770,433	4,618,839
Allowance for loan losses	(57,674)	(59,468)
Net loans	4,712,759	4,559,371
Bank owned life insurance	171,042	169,284
Goodwill	72,334	72,334
Premises and equipment, net	54,654	55,278
Other real estate owned	19,185	34,636
Interest Receivable	18,210	18,335
Mortgage loan servicing rights	8,632	9,013
Other	151,939	147,166
Total assets	7,013,272	6,638,347
Liabilities and Shareholders' Equity:
Noninterest bearing	1,175,991	1,193,553
Interest bearing	3,953,013	3,596,441
Total deposits	5,129,004	4,789,994
Short-term borrowings	268,718	242,029
Long-term debt	788,685	810,541
Subordinated debentures and notes	80,250	80,250
Accrued interest payable	2,804	2,901
Other	55,795	60,885
Total liabilities	6,325,256	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; 16,150,902 shares issued at September 30, 2014 and 16,150,941 shares issued at December 31, 2013)	303,003	302,651
Retained earnings	476,930	460,643
Treasury shares (758,489 shares at September 30, 2014 and 738,989 at December 31, 2013)	(77,613)	(76,128)
Accumulated other comprehensive loss, net of taxes	(14,304)	(35,419)
Total shareholders' equity	688,016	651,747
Total liabilities and shareholders' equity	$ 7,013,272	$ 6,638,347