Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 168,600	$ 141,663
Federal funds sold	3,512	672
Interest bearing deposits in banks	331,536	392,492
Total cash and cash equivalents	503,648	534,827
Investment securities:
Available-for-sale	1,506,996	1,947,706
Held-to-maturity (estimated fair values of $592,682 and $205,926 at June 30, 2014 and December 31, 2013, respectively)	586,989	203,837
Total investment securities	2,093,985	2,151,543
Loans held for investment	4,449,699	4,303,992
Mortgage loans held for sale	56,663	40,861
Total loans	4,506,362	4,344,853
Less allowance for loan losses	78,266	85,339
Net loans	4,428,096	4,259,514
Goodwill	183,673	183,673
Premises and equipment, net of accumulated depreciation	180,341	179,690
Company-owned life insurance	138,899	122,175
Other real estate owned (OREO)	16,425	15,504
Accrued interest receivable	26,497	26,450
Mortgage servicing rights, net of accumulated amortization and impairment reserve	13,443	13,546
Deferred tax asset, net	0	12,154
Core deposit intangibles, net of accumulated amortization	3,811	4,519
Other assets	62,561	61,056
Total assets	7,651,379	7,564,651
Deposits:
Non-interest bearing	1,533,484	1,491,683
Interest bearing	4,645,558	4,642,067
Total deposits	6,179,042	6,133,750
Securities sold under repurchase agreements	462,985	457,437
Accounts payable and accrued expenses	42,693	47,523
Accrued interest payable	5,316	4,963
Deferred tax liability	3,427	0
Long-term debt	36,893	36,917
Other borrowed funds	20	3
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	6,812,853	6,763,070
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of June 30, 2014 or December 31, 2013	0	0
Common stock	283,697	285,535
Retained earnings	560,469	532,087
Accumulated other comprehensive income, net	(5,640)	(16,041)
Total stockholders' equity	838,526	801,581
Total liabilities and stockholders' equity	$ 7,651,379	$ 7,564,651