Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Cash and due from banks	$ 135,440	$ 164,120
Money market instruments	179,434	37,185
Cash and cash equivalents	314,874	201,305
Investment securities:
Securities available-for-sale, at fair value (amortized cost of $1,166,888 and $1,099,658 at September 30, 2013 and December 31, 2012)	1,129,483	1,114,454
Securities held-to-maturity, at amortized cost (fair value of $199,941 and $410,705 at September 30, 2013 and December 31, 2012)	193,997	401,390
Other investment securities	65,907	65,907
Total investment securities	1,389,387	1,581,751
Loans	4,573,537	4,450,322
Allowance for loan losses	(57,894)	(55,537)
Net loans	4,515,643	4,394,785
Bank owned life insurance	168,156	161,069
Goodwill and other intangible assets	72,334	72,671
Bank premises and equipment, net	56,116	53,751
Other real estate owned	35,412	35,718
Accrued interest receivable	17,954	19,710
Mortgage loan servicing rights	9,132	7,763
Other	126,883	114,280
Total assets	6,705,891	6,642,803
Liabilities and Stockholders' Equity:
Noninterest bearing	1,109,194	1,137,290
Interest bearing	3,741,498	3,578,742
Total deposits	4,850,692	4,716,032
Short-term borrowings	272,505	344,168
Long-term debt	809,336	781,658
Subordinated debentures and notes	80,250	80,250
Accrued interest payable	3,196	3,459
Other	57,167	66,870
Total liabilities	6,073,146	5,992,437
COMMITMENTS AND CONTINGENCIES
Stockholders' equity:
Common stock (No par value; 20,000,000 shares authorized; 16,150,952 shares issued at September 30, 2013 and 16,150,987 shares issued at December 31, 2012)	302,652	302,654
Retained earnings	457,917	441,605
Treasury stock (738,989 shares at September 30, 2013 and at December 31, 2012)	(76,375)	(76,375)
Accumulated other comprehensive (loss), net of taxes	(51,449)	(17,518)
Total stockholders' equity	632,745	650,366
Total liabilities and stockholders' equity	$ 6,705,891	$ 6,642,803