Consolidated Condensed Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2011	Dec. 31, 2010
Assets:
Cash and due from banks	$ 111,472	$ 109,058
Money market instruments	22,775	24,722
Cash and cash equivalents	134,247	133,780
Investment securities
Securities available-for-sale, at fair value (amortized cost of $1,349,431 and $1,274,258 at March 31, 2011 and December 31, 2010)	1,362,893	1,297,522
Securities held-to-maturity, at amortized cost (fair value of $625,334 and $686,114 at March 31, 2011 and December 31, 2010)	614,064	673,570
Other investment securities	68,699	68,699
Total investment securities	2,045,656	2,039,791
Loans	4,750,975	4,732,685
Allowance for loan losses	(148,530)	(143,525)
Net loans	4,602,445	4,589,110
Bank owned life insurance	150,683	146,450
Goodwill and other intangible assets	77,708	78,377
Bank premises and equipment, net	69,673	69,567
Other real estate owned	45,268	41,709
Accrued interest receivable	25,083	24,137
Mortgage loan servicing rights	10,365	10,488
Other	161,977	148,852
Total assets	7,323,105	7,282,261
Liabilities and Stockholders' Equity:
Noninterest bearing	955,005	937,719
Interest bearing	4,359,673	4,157,701
Total deposits	5,314,678	5,095,420
Short-term borrowings	316,719	663,669
Long-term debt	786,709	636,733
Subordinated debentures and notes	75,250	75,250
Accrued interest payable	6,255	6,123
Other	93,554	75,358
Total liabilities	6,593,165	6,552,553
COMMITMENTS AND CONTINGENCIES
Stockholders' equity:
Preferred stock (200,000 shares authorized; 100,000 shares issued with $1,000 per share liquidation preference)	97,504	97,290
Common stock (No par value; 20,000,000 shares authorized; 16,151,052 shares issued at March 31, 2011 and 16,151,062 shares issued at December 31, 2010)	301,203	301,204
Common stock warrants	4,473	4,473
Retained earnings	412,599	406,342
Treasury stock (752,129 shares at March 31, 2011 and 752,128 shares at December 31, 2010)	(77,733)	(77,733)
Accumulated other comprehensive (loss), net of taxes	(8,106)	(1,868)
Total stockholders' equity	729,940	729,708
Total liabilities and stockholders' equity	$ 7,323,105	$ 7,282,261