Consolidated statements of income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income:
Interest and fees on loans	$ 54,529	$ 29,350	$ 105,222	$ 58,356
Interest on securities
Taxable	3,134	2,589	5,986	5,156
Tax-exempt	981	1,068	1,906	2,108
Other	399	271	777	547
Total interest income	59,043	33,278	113,891	66,167
Deposits
Demand and savings accounts	3,951	1,703	7,266	3,234
Time deposits	1,947	604	3,703	1,187
Short-term borrowings	694	112	1,116	210
Long-term debt	934	432	1,860	858
Total interest expense	7,526	2,851	13,945	5,489
Net interest income	51,517	30,427	99,946	60,678
Provision for loan losses	1,063	(865)	1,380	(1,122)
Net interest income after provision for loan losses	50,454	31,292	98,566	61,800
Noninterest income:
Mortgage banking income	28,544	30,239	55,015	55,319
(Loss) gain from securities, net	(42)	29	(89)	30
(Loss) gain from other assets	(155)	39	(87)	39
Other income	1,500	543	2,805	1,174
Total noninterest income	35,763	35,657	69,038	66,744
Noninterest expenses:
Salaries, commissions and employee benefits	34,508	30,783	68,657	59,789
Occupancy and equipment expense	3,744	3,307	7,349	6,416
Legal and professional fees	1,965	1,033	4,008	2,461
Data processing	2,138	1,460	4,173	2,961
Merger and conversion		767	1,193	1,254
Amortization of core deposit and other intangibles	802	123	1,655	515
Loss on sale of mortgage servicing rights		249		249
Regulatory fees and deposit insurance assessments	730	494	1,292	929
Software license and maintenance fees	390	364	857	821
Advertising	3,408	3,343	6,690	6,275
Other expense	8,673	7,213	16,635	13,883
Total noninterest expense	56,358	49,136	112,509	95,553
Income before income taxes	29,859	17,813	55,095	32,991
Income tax expense (Note 7)	7,794	6,574	13,276	11,999
Net income	$ 22,065	$ 11,239	$ 41,819	$ 20,992
Earnings per common share:
Basic	$ 0.72	$ 0.44	$ 1.36	$ 0.84
Fully diluted	0.70	$ 0.43	1.33	$ 0.82
Dividends declared per common share	$ 0.06		$ 0.06
Service Charges on Deposit Accounts
Noninterest income:
Noninterest income:	$ 2,132	$ 1,796	$ 4,229	$ 3,562
ATM and Interchange Fees
Noninterest income:
Noninterest income:	2,581	2,085	4,942	4,132
Investment Services and Trust Income
Noninterest income:
Noninterest income:	1,180	903	2,386	1,717
Gain (Loss) on Sales or Write-Downs of Other Real Estate Owned
Noninterest income:
Noninterest income:	$ 23	$ 23	$ (163)	$ 771