Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 139,879	$ 147,894
Federal funds sold	2,263	543
Interest bearing deposits in banks	566,153	650,233
Total cash and cash equivalents	708,295	798,670
Investment securities:
Available-for-sale	1,545,093	1,711,924
Held-to-maturity (estimated fair values of $534,633 and $584,533 at September 30, 2015 and December 31, 2014, respectively)	522,543	575,186
Total investment securities	2,067,636	2,287,110
Loans held for investment	5,120,794	4,856,615
Mortgage loans held for sale	55,686	40,828
Total loans	5,176,480	4,897,443
Less allowance for loan losses	74,256	74,200
Net loans	5,102,224	4,823,243
Goodwill	204,409	205,574
Premises and equipment, net of accumulated depreciation	190,386	195,212
Company-owned life insurance	185,990	153,821
Other real estate owned (OREO)	8,031	13,554
Accrued interest receivable	31,590	27,063
Core deposit intangibles, net of accumulated amortization	11,425	13,282
Mortgage servicing rights, net of accumulated amortization and impairment reserve	15,336	14,038
Deferred tax asset, net	0	4,874
Other assets	79,208	73,495
Total assets	8,604,530	8,609,936
Deposits:
Non-interest bearing	1,832,535	1,791,364
Interest bearing	5,203,259	5,214,848
Total deposits	7,035,794	7,006,212
Securities sold under repurchase agreements	437,533	502,250
Accounts payable and accrued expenses	48,698	66,164
Accrued interest payable	5,327	5,833
Deferred tax liability	13,027	0
Long-term debt	43,089	38,067
Other borrowed funds	10	9
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	7,665,955	7,701,012
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of September 30, 2015 or December 31, 2014	0	0
Common stock	309,167	323,596
Retained earnings	623,967	587,862
Accumulated other comprehensive income, net	5,441	(2,534)
Total stockholders' equity	938,575	908,924
Total liabilities and stockholders' equity	$ 8,604,530	$ 8,609,936