Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 146,779	$ 132,595
Federal funds sold	95	563
Interest bearing deposits in banks	635,149	647,299
Total cash and cash equivalents	782,023	780,457
Investment securities:
Available-for-sale	1,611,698	1,456,840
Held-to-maturity (estimated fair values of $513,273 and $607,550 at December 31, 2016 and 2015, respectively)	512,770	600,665
Total investment securities	2,124,468	2,057,505
Loans held for investment	5,416,750	5,193,321
Mortgage loans held for sale	61,794	52,875
Total loans	5,478,544	5,246,196
Less allowance for loan losses	76,214	76,817
Net loans	5,402,330	5,169,379
Premises and equipment, net of accumulated depreciation	194,457	190,812
Goodwill	212,820	204,523
Company-owned life insurance	198,116	187,253
Other real estate owned (“OREO”)	10,019	6,254
Accrued interest receivable	29,852	27,729
Mortgage servicing rights, net of accumulated amortization and impairment reserve	18,457	15,621
Core deposit intangibles, net of accumulated amortization	9,648	10,589
Other assets	81,705	78,074
Total assets	9,063,895	8,728,196
Deposits:
Non-interest bearing	1,906,257	1,823,716
Interest bearing	5,469,853	5,265,221
Total deposits	7,376,110	7,088,937
Securities sold under repurchase agreements	537,556	510,635
Accounts payable and accrued expenses	44,923	53,042
Accrued interest payable	5,421	4,960
Deferred tax liability, net	6,839	9,765
Long-term debt	27,970	27,885
Other borrowed funds	6	2
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	8,081,302	7,777,703
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued or outstanding as of December 31, 2016 and 2015	0	0
Common stock	296,071	311,720
Retained earnings	694,650	638,367
Accumulated other comprehensive income (loss), net	(8,128)	406
Total stockholders’ equity	982,593	950,493
Total liabilities and stockholders’ equity	$ 9,063,895	$ 8,728,196