Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Cash and due from banks	$ 109,058	$ 116,802
Money market instruments	24,722	42,289
Cash and cash equivalents	133,780	159,091
Investment securities:
Securities available-for-sale, at fair value (amortized cost of $1,274,258 and $1,241,381 at December 31, 2010 and 2009, respectively)	1,297,522	1,287,727
Securities held-to-maturity, at amortized cost (fair value of $686,114 and $523,450 at December 31, 2010 and 2009, respectively)	673,570	506,914
Other investment securities	68,699	68,919
Total investment securities	2,039,791	1,863,560
Total loans	4,732,685	4,640,432
Allowance for loan losses	(143,575)	(116,717)
Net loans	4,589,110	4,523,715
Other assets:
Bank owned life insurance	146,450	137,133
Goodwill	72,334	72,334
Other intangibles	6,043	9,465
Premises and equipment, net	69,567	69,091
Accrued interest receivable	24,137	24,354
Other real estate owned	41,709	41,240
Mortgage loan servicing rights	10,488	10,780
Other	148,852	129,566
Total other assets	519,580	493,963
Total assets	7,282,261	7,040,329
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest bearing	937,719	897,243
Interest bearing	4,157,701	4,290,809
Total deposits	5,095,420	5,188,052
Short-term borrowings	663,669	324,219
Long-term debt	636,733	654,381
Subordinated debentures	75,250	75,250
Total borrowings	1,375,652	1,053,850
Other liabilities:
Accrued interest payable	6,123	9,330
Other	75,358	71,833
Total other liabilities	81,481	81,163
Total liabilities	6,552,553	6,323,065
COMMITMENTS AND CONTINGENCIES
Stockholders' equity:
Preferred stock (200,000 shares authorized; 100,000 shares issued with $1,000 per share liquidation preference)	97,290	96,483
Common stock, no par value (20,000,000 shares authorized; 16,151,062 shares issued at December 31, 2010 and 16,151,112 issued at December 31, 2009)	301,204	301,208
Common stock warrants	4,473	5,361
Accumulated other comprehensive income (loss), net	(1,868)	15,661
Retained earnings	406,342	423,872
Less: Treasury stock (752,128 shares at December 31, 2010 and 1,268,332 shares at December 31, 2009)	(77,733)	(125,321)
Total stockholders' equity	729,708	717,264
Total liabilities and stockholders' equity	$ 7,282,261	$ 7,040,329