Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 196,495	$ 146,779
Federal funds sold	146	95
Interest bearing deposits in banks	562,345	635,149
Total cash and cash equivalents	758,986	782,023
Investment securities:
Available-for-sale	2,208,712	1,611,698
Held-to-maturity (estimated fair values of $483,349 and $513,273 at December 31, 2017 and 2016, respectively)	484,494	512,770
Total investment securities	2,693,206	2,124,468
Loans held for investment	7,567,720	5,416,750
Mortgage loans held for sale	46,635	61,794
Total loans	7,614,355	5,478,544
Less allowance for loan losses	72,147	76,214
Net loans	7,542,208	5,402,330
Premises and equipment, net of accumulated depreciation	241,862	194,457
Goodwill	444,704	212,820
Company-owned life insurance	260,551	198,116
Other real estate owned (“OREO”)	10,053	10,019
Accrued interest receivable	38,031	29,852
Mortgage servicing rights, net of accumulated amortization and impairment reserve	24,770	18,457
Deferred tax asset, net	4,028	0
Core deposit intangibles, net of accumulated amortization	49,109	9,648
Other assets	145,747	81,705
Total assets	12,213,255	9,063,895
Deposits:
Non-interest bearing	2,900,042	1,906,257
Interest bearing	7,034,829	5,469,853
Total deposits	9,934,871	7,376,110
Securities sold under repurchase agreements	642,961	537,556
Accounts payable and accrued expenses	86,596	44,923
Accrued interest payable	5,599	5,421
Deferred tax liability, net	0	6,839
Long-term debt	13,126	27,970
Other borrowed funds	20,009	6
Subordinated debentures held by subsidiary trusts	82,477	82,477
Total liabilities	10,785,639	8,081,302
Stockholders’ equity:
Nonvoting noncumulative preferred stock without par value; authorized 100,000 shares; no shares issued or outstanding as of December 31, 2017 and 2016	0	0
Common stock	686,991	296,071
Retained earnings	752,588	694,650
Accumulated other comprehensive income (loss), net	(11,963)	(8,128)
Total stockholders’ equity	1,427,616	982,593
Total liabilities and stockholders’ equity	$ 12,213,255	$ 9,063,895