Consolidated statements of income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest income:
Interest and fees on loans	$ 105,865	$ 87,723	$ 75,138
Interest on securities
Taxable	10,646	11,783	14,375
Tax-exempt	3,372	2,808	2,932
Other	611	468	444
Total interest income	120,494	102,782	92,889
Deposits
Demand and savings accounts	5,413	4,733	4,241
Time deposits	1,929	1,559	2,483
Short-term borrowings	121	712	642
Long-term debt	2,081	1,906	2,147
Total interest expense	9,544	8,910	9,513
Net interest income	110,950	93,872	83,376
Provision for loan losses	(1,479)	(3,064)	(2,716)
Net interest income after provision for loan losses	112,429	96,936	86,092
Noninterest income:
Mortgage banking income	117,751	70,190	31,135
Service charges on deposit accounts	8,009	7,389	7,333
ATM and interchange fees	7,791	6,536	5,633
Investment services income	3,337	3,260	3,520
Bargain purchase gain		2,794
Gain on sale of securities	4,407	1,844	2,000
Gain (loss) on sales or write-downs of foreclosed assets	1,282	(317)	132
(Loss) gain on other assets	(103)	(393)	19
Other income	2,211	1,077	1,030
Total noninterest income	144,685	92,380	50,802
Noninterest expenses:
Salaries, commissions and employee benefits	113,992	84,214	63,863
Occupancy and equipment expense	12,611	10,777	9,421
Legal and professional fees	3,514	3,355	3,175
Data processing	4,181	2,053	2,430
Merger and conversion	3,268	3,543
Amortization of core deposit intangibles	2,132	1,731	1,613
Amortization of mortgage servicing rights	8,321	2,601	397
Impairment of mortgage servicing rights	4,678	194	0
Loss on sale of mortgage servicing rights	4,447
Regulatory fees and deposit insurance assessments	1,952	2,190	1,938
Software license and maintenance fees	2,874	1,986	1,416
Advertising	10,608	7,866	2,873
Other expense	22,212	17,982	15,037
Total noninterest expense	194,790	138,492	102,163
Income before income taxes	62,324	50,824	34,731
Income tax expense (Note 15)	21,733	2,968	2,269
Net income	$ 40,591	$ 47,856	$ 32,462
Per share information:
Basic	19,165,182	17,180,000	17,180,000
Fully diluted	19,312,174	17,180,000	17,180,000
Earnings per share
Basic	$ 2.12	$ 2.79	$ 1.89
Fully diluted	$ 2.10	$ 2.79	$ 1.89
Unaudited pro forma (C Corporation basis) (Note 15):
Income tax expense	$ 22,902	$ 17,829	$ 12,375
Net income	$ 39,422	$ 32,995	$ 22,356
Earnings per share
Basic	$ 2.06	$ 1.92	$ 1.30
Fully diluted	$ 2.04	$ 1.92	$ 1.30