Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 141,663	$ 177,978
Federal funds sold	672	730
Interest bearing deposits in banks	392,492	622,624
Total cash and cash equivalents	534,827	801,332
Investment securities:
Available-for-sale	1,947,706	1,995,258
Held-to-maturity (estimated fair values of $205,926 and $218,933 at December 31, 2013 and 2012, respectively)	203,837	208,223
Total investment securities	2,151,543	2,203,481
Loans held for investment	4,303,992	4,157,470
Mortgage loans held for sale	40,861	66,442
Total loans	4,344,853	4,223,912
Less allowance for loan losses	85,339	100,511
Net loans	4,259,514	4,123,401
Premises and equipment, net of accumulated depreciation	179,690	187,565
Goodwill	183,673	183,673
Company-owned life insurance	122,175	76,729
Other real estate owned (“OREO”)	15,504	32,571
Accrued interest receivable	26,450	28,869
Mortgage servicing rights, net of accumulated amortization and impairment reserve	13,546	12,653
Deferred tax asset, net	12,154	2,597
Core deposit intangibles, net of accumulated amortization	4,519	5,937
Other assets	61,056	62,953
Total assets	7,564,651	7,721,761
Deposits:
Non-interest bearing	1,491,683	1,495,309
Interest bearing	4,642,067	4,745,102
Total deposits	6,133,750	6,240,411
Securities sold under repurchase agreements	457,437	505,785
Accounts payable and accrued expenses	47,523	48,208
Accrued interest payable	4,963	6,502
Long-term debt	36,917	37,160
Other borrowed funds	3	32
Preferred stock pending redemption	0	50,000
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	6,763,070	6,970,575
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued or outstanding as of December 31, 2013; 5,000 shares issued and outstanding as of December 31, 2012	0	0
Common stock	285,535	271,335
Retained earnings	532,087	463,860
Accumulated other comprehensive income (loss), net	(16,041)	15,991
Total stockholders’ equity	801,581	751,186
Total liabilities and stockholders’ equity	$ 7,564,651	$ 7,721,761