Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 125,995	$ 132,595
Federal funds sold	146	563
Interest bearing deposits in banks	349,910	647,299
Total cash and cash equivalents	476,051	780,457
Investment securities:
Available-for-sale	1,505,581	1,456,840
Held-to-maturity (estimated fair values of $574,482 and $607,550 at June 30, 2016 and December 31, 2015, respectively)	556,247	600,665
Total investment securities	2,061,828	2,057,505
Loans held for investment	5,340,189	5,193,321
Mortgage loans held for sale	73,053	52,875
Total loans	5,413,242	5,246,196
Less allowance for loan losses	80,340	76,817
Net loans	5,332,902	5,169,379
Goodwill	204,481	204,523
Premises and equipment, net of accumulated depreciation	187,538	190,812
Company-owned life insurance	189,524	187,253
Other real estate owned (OREO)	7,908	6,254
Accrued interest receivable	27,448	27,729
Core deposit intangibles, net of accumulated amortization	8,935	10,589
Mortgage servicing rights, net of accumulated amortization and impairment reserve	16,038	15,621
Other assets	92,723	78,074
Total assets	8,605,376	8,728,196
Deposits:
Non-interest bearing	1,783,609	1,823,716
Interest bearing	5,197,839	5,265,221
Total deposits	6,981,448	7,088,937
Securities sold under repurchase agreements	466,399	510,635
Accounts payable and accrued expenses	59,664	53,042
Accrued interest payable	5,647	4,960
Deferred tax liability	16,673	9,765
Long-term debt	27,928	27,885
Other borrowed funds	15	2
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	7,640,251	7,777,703
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of June 30, 2016 or December 31, 2015	0	0
Common stock	290,366	311,720
Retained earnings	664,337	638,367
Accumulated other comprehensive income, net	10,422	406
Total stockholders' equity	965,125	950,493
Total liabilities and stockholders' equity	$ 8,605,376	$ 8,728,196