Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Assets:
Cash and due from banks	$ 121,730	$ 137,770
Money market instruments	39,400	19,716
Cash and cash equivalents	161,130	157,486
Investment securities
Securities available-for-sale, at fair value (amortized cost of $991,372 and $801,147 at March 31, 2012 and December 31, 2011)	1,007,481	820,645
Securities held-to-maturity, at amortized cost (fair value of $795,075 and $834, 574 at March 31, 2012 and December 31, 2011)	782,250	820,224
Other investment securities	67,604	67,604
Total investment securities	1,857,335	1,708,473
Loans	4,324,383	4,317,099
Allowance for loan losses	(59,758)	(68,444)
Net loans	4,264,625	4,248,655
Bank owned life insurance	157,225	154,567
Goodwill and other intangible assets	73,089	74,843
Bank premises and equipment, net	52,157	53,741
Other real estate owned	41,965	42,272
Accrued interest receivable	21,227	19,697
Mortgage loan servicing rights	8,975	9,301
Other	139,123	120,748
Assets held for sale		382,462
Total assets	6,776,851	6,972,245
Liabilities and Stockholders' Equity:
Noninterest bearing	1,055,745	995,733
Interest bearing	3,761,643	3,469,381
Total deposits	4,817,388	4,465,114
Short-term borrowings	236,687	263,594
Long-term debt	821,801	823,182
Subordinated debentures and notes	75,250	75,250
Accrued interest payable	5,034	4,916
Other	64,262	61,639
Liabilities held for sale		536,186
Total liabilities	6,020,422	6,229,881
COMMITMENTS AND CONTINGENCIES
Stockholders' equity:
Preferred stock (200,000 shares authorized; 100,000 shares issued with $1,000 per share liquidation preference)	98,372	98,146
Common stock (No par value; 20,000,000 shares authorized; 16,151,014 shares issued at March 31, 2012 and 16,151,021 shares issued at December 31, 2011)	301,201	301,202
Common stock warrants	4,297	4,297
Retained earnings	440,074	424,557
Treasury stock (745,109 shares at March 31, 2012 and 745,109 shares at December 31, 2011)	(77,007)	(77,007)
Accumulated other comprehensive (loss), net of taxes	(10,508)	(8,831)
Total stockholders' equity	756,429	742,364
Total liabilities and stockholders' equity	$ 6,776,851	$ 6,972,245