Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 177,978	$ 142,502
Federal funds sold	730	309
Interest bearing deposits in banks	622,624	329,636
Total cash and cash equivalents	801,332	472,447
Investment securities:
Available-for-sale	1,995,258	2,016,864
Held-to-maturity (estimated fair values of $218,933 and $161,877 at December 31, 2012 and 2011, respectively)	208,223	152,781
Total investment securities	2,203,481	2,169,645
Loans held for investment	4,157,470	4,133,028
Mortgage loans held for sale	66,442	53,521
Total loans	4,223,912	4,186,549
Less allowance for loan losses	100,511	112,581
Net loans	4,123,401	4,073,968
Premises and equipment, net of accumulated depreciation	187,565	184,771
Goodwill	183,673	183,673
Company-owned life insurance	76,729	74,880
Other real estate owned (“OREO”)	32,571	37,452
Accrued interest receivable	28,869	31,974
Mortgage servicing rights, net of accumulated amortization and impairment reserve	12,653	11,555
Deferred tax asset, net	2,597	9,628
Core deposit intangibles, net of accumulated amortization	5,937	7,357
Other assets	62,953	68,177
Total assets	7,721,761	7,325,527
Deposits:
Non-interest bearing	1,495,309	1,271,709
Interest bearing	4,745,102	4,555,262
Total deposits	6,240,411	5,826,971
Securities sold under repurchase agreements	505,785	516,243
Accounts payable and accrued expenses	48,208	42,248
Accrued interest payable	6,502	8,123
Long-term debt	37,160	37,200
Other borrowed funds	32	7
Preferred stock pending redemption	50,000	0
Subordinated debentures held by subsidiary trusts	82,477	123,715
Total liabilities	6,970,575	6,554,507
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; issued and outstanding 5,000 shares as of December 31, 2012 and 2011	0	50,000
Common stock	271,335	266,842
Retained earnings	463,860	435,144
Accumulated other comprehensive income, net	15,991	19,034
Total stockholders’ equity	751,186	771,020
Total liabilities and stockholders’ equity	$ 7,721,761	$ 7,325,527