Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 223,880	$ 146,779
Federal funds sold	419	95
Interest bearing deposits in banks	695,476	635,149
Total cash and cash equivalents	919,775	782,023
Investment securities:
Available-for-sale	2,080,194	1,611,698
Held-to-maturity (estimated fair values of $535,145 and $513,273 at June 30, 2017 and December 31, 2016, respectively)	529,442	512,770
Total investment securities	2,609,636	2,124,468
Loans held for investment	7,525,590	5,416,750
Mortgage loans held for sale	30,383	61,794
Total loans	7,555,973	5,478,544
Less allowance for loan losses	75,701	76,214
Net loans	7,480,272	5,402,330
Goodwill	444,327	212,820
Premises and equipment, net of accumulated depreciation	243,152	194,457
Company-owned life insurance	257,538	198,116
Other real estate owned (OREO)	11,286	10,019
Deferred tax asset, net	9,406	0
Accrued interest receivable	35,830	29,852
Core deposit intangibles, net of accumulated amortization	52,837	9,648
Mortgage servicing rights, net of accumulated amortization and impairment reserve	23,715	18,457
Other assets	148,568	81,705
Total assets	12,236,342	9,063,895
Deposits:
Non-interest bearing	2,897,813	1,906,257
Interest bearing	7,122,187	5,469,853
Total deposits	10,020,000	7,376,110
Securities sold under repurchase agreements	579,772	537,556
Accounts payable and accrued expenses	96,762	44,923
Accrued interest payable	8,917	5,421
Deferred tax liability	0	6,839
Long-term debt	28,017	27,970
Other borrowed funds	15,019	6
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	10,830,964	8,081,302
Stockholders' equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued and outstanding as of June 30, 2017 or December 31, 2016	0	0
Common stock	685,289	296,071
Retained earnings	718,093	694,650
Accumulated other comprehensive income, net	1,996	(8,128)
Total stockholders' equity	1,405,378	982,593
Total liabilities and stockholders' equity	$ 12,236,342	$ 9,063,895