Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 163,057	$ 147,894
Federal funds sold	2,763	543
Interest bearing deposits in banks	340,614	650,233
Total cash and cash equivalents	506,434	798,670
Investment securities:
Available-for-sale	1,592,743	1,711,924
Held-to-maturity (estimated fair values of $553,323 and $584,533 at June 30, 2015 and December 31, 2014, respectively)	546,690	575,186
Total investment securities	2,139,433	2,287,110
Loans held for investment	5,028,624	4,856,615
Mortgage loans held for sale	75,322	40,828
Total loans	5,103,946	4,897,443
Less allowance for loan losses	76,552	74,200
Net loans	5,027,394	4,823,243
Goodwill	204,375	205,574
Premises and equipment, net of accumulated depreciation	189,488	195,212
Company-owned life insurance	177,625	153,821
Other real estate owned (OREO)	11,773	13,554
Accrued interest receivable	29,008	27,063
Core deposit intangibles, net of accumulated amortization	11,573	13,282
Mortgage servicing rights, net of accumulated amortization and impairment reserve	14,654	14,038
Deferred tax asset, net	0	4,874
Other assets	74,461	73,495
Total assets	8,386,218	8,609,936
Deposits:
Non-interest bearing	1,757,641	1,791,364
Interest bearing	5,046,760	5,214,848
Total deposits	6,804,401	7,006,212
Securities sold under repurchase agreements	469,145	502,250
Accounts payable and accrued expenses	53,879	66,164
Accrued interest payable	5,366	5,833
Deferred tax liability	3,024	0
Long-term debt	43,068	38,067
Other borrowed funds	3	9
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	7,461,363	7,701,012
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of June 30, 2015 or December 31, 2014	0	0
Common stock	313,125	323,596
Retained earnings	612,875	587,862
Accumulated other comprehensive income, net	(1,145)	(2,534)
Total stockholders' equity	924,855	908,924
Total liabilities and stockholders' equity	$ 8,386,218	$ 8,609,936