Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and due from banks	$ 130,413	$ 107,035
Federal funds sold	1,764	2,114
Interest bearing deposits in banks	283,314	576,469
Total cash and cash equivalents	415,491	685,618
Investment securities:
Available-for-sale	1,873,864	1,786,335
Held-to-maturity (estimated fair values of $153,448 as of June 30, 2011 and $146,508 as of December 31, 2010)	148,865	147,068
Total investment securities	2,022,729	1,933,403
Loans	4,281,260	4,367,909
Less allowance for loan losses	124,579	120,480
Net loans	4,156,681	4,247,429
Premises and equipment, net of accumulated depreciation	186,529	188,138
Goodwill	183,673	183,673
Company-owned life insurance	74,080	73,056
Accrued interest receivable	33,588	33,628
Other real estate owned ("OREO"), net of write-downs	28,323	33,632
Mortgage servicing rights, net of accumulated amortization and impairment reserve	13,218	13,191
Deferred tax asset	10,466	18,472
Core deposit intangibles, net of accumulated amortization	8,080	8,803
Other assets	69,933	81,927
Total assets	7,202,791	7,500,970
Deposits:
Non-interest bearing	1,109,905	1,063,869
Interest bearing	4,684,760	4,861,844
Total deposits	5,794,665	5,925,713
Securities sold under repurchase agreements	435,039	620,154
Accounts payable and accrued expenses	35,395	38,915
Accrued interest payable	11,712	13,178
Long-term debt	37,480	37,502
Other borrowed funds	5,440	4,991
Subordinated debentures held by subsidiary trusts	123,715	123,715
Total liabilities	6,443,446	6,764,168
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; issued and outstanding 5,000 shares as of June 30, 2011 and December 31, 2010	50,000	50,000
Common stock	265,639	264,174
Retained earnings	421,309	413,253
Accumulated other comprehensive income, net	22,397	9,375
Total stockholders' equity	759,345	736,802
Total liabilities and stockholders' equity	$ 7,202,791	$ 7,500,970