Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and due from banks	$ 135,229	$ 107,035
Federal funds sold	2,119	2,114
Interest bearing deposits in banks	366,879	576,469
Total cash and cash equivalents	504,227	685,618
Investment securities:
Available-for-sale	1,896,385	1,786,335
Held-to-maturity (estimated fair values of $157,639 as of September 30, 2011 and $146,508 as of December 31, 2010)	149,411	147,068
Total investment securities	2,045,796	1,933,403
Loans held for investment	4,223,229	4,321,501
Mortgage loans held for sale	52,488	46,408
Total loans	4,275,717	4,367,909
Less allowance for loan losses	120,303	120,480
Net loans	4,155,414	4,247,429
Premises and equipment, net of accumulated depreciation	185,742	188,138
Goodwill	183,673	183,673
Company-owned life insurance	74,362	73,056
Accrued interest receivable	34,994	33,628
Other real estate owned ("OREO"), net of write-downs	25,080	33,632
Mortgage servicing rights, net of accumulated amortization and impairment reserve	11,909	13,191
Deferred tax asset	8,393	18,472
Core deposit intangibles, net of accumulated amortization	7,719	8,803
Other assets	69,845	81,927
Total assets	7,307,154	7,500,970
Deposits:
Non-interest bearing	1,243,703	1,063,869
Interest bearing	4,607,616	4,861,844
Total deposits	5,851,319	5,925,713
Securities sold under repurchase agreements	475,522	620,154
Accounts payable and accrued expenses	37,266	38,915
Accrued interest payable	8,786	13,178
Long-term debt	37,469	37,502
Other borrowed funds	5,122	4,991
Subordinated debentures held by subsidiary trusts	123,715	123,715
Total liabilities	6,539,199	6,764,168
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; issued and outstanding 5,000 shares as of September 30, 2011 and December 31, 2010	50,000	50,000
Common stock	266,317	264,174
Retained earnings	427,556	413,253
Accumulated other comprehensive income, net	24,082	9,375
Total stockholders' equity	767,955	736,802
Total liabilities and stockholders' equity	$ 7,307,154	$ 7,500,970