CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
INTEREST INCOME
Loans	$ 119,271	$ 85,625	$ 64,915	$ 289,069	$ 170,905
Investment securities and other interest-earning assets	9,605	7,074	5,246	23,333	13,416
Total interest income	128,876	92,699	70,161	312,402	184,321
INTEREST EXPENSE
Deposits	11,942	7,756	3,557	25,612	8,774
FHLB advances and other borrowings	2,494	2,125	1,162	6,642	2,940
Subordinated debentures	1,727	1,647	1,151	4,983	3,275
Total interest expense	16,163	11,528	5,870	37,237	14,989
Net interest income before provision for credit losses	112,713	81,171	64,291	275,165	169,332
Provision for credit losses	1,981	1,761	2,049	5,995	6,238
Net interest income after provision for credit losses	110,732	79,410	62,242	269,170	163,094
NONINTEREST INCOME
Loan servicing fees	400	292	276	1,037	641
Earnings on bank-owned life insurance	1,270	617	629	2,498	1,654
Net gain from sales of loans	2,029	3,843	3,439	8,830	9,137
Net gain from sales of investment securities	1,063	330	896	1,399	2,989
Other income	530	753	936	2,697	2,370
Total noninterest income	7,544	8,151	8,221	23,361	21,663
NONINTEREST EXPENSE
Compensation and benefits	37,901	29,274	21,707	96,048	58,218
Premises and occupancy	7,214	5,045	4,016	17,040	10,202
Data processing	4,095	2,747	2,082	9,544	5,708
Other real estate owned operations, net	0	2	3	3	59
FDIC insurance premiums	1,060	581	379	2,252	1,652
Legal, audit and professional expense	3,280	1,816	1,978	6,935	4,177
Marketing expense	1,569	1,352	1,248	4,451	3,072
Office, telecommunications and postage expense	1,538	1,115	835	3,733	2,190
Loan expense	1,139	594	1,017	2,324	2,553
Deposit expense	2,137	2,302	1,655	6,115	4,762
Merger-related expense	13,978	943	503	15,857	15,566
CDI amortization	4,693	1,996	1,761	8,963	4,033
Other expense	3,482	2,309	2,428	8,705	5,880
Total noninterest expense	82,086	50,076	39,612	181,970	118,072
Net income before income taxes	36,190	37,485	30,851	110,561	66,685
Income tax	7,798	10,182	10,619	26,864	22,756
Net income	$ 28,392	$ 27,303	$ 20,232	$ 83,697	$ 43,929
EARNINGS PER SHARE
Basic (in dollars per share)	$ 0.46	$ 0.59	$ 0.51	$ 1.63	$ 1.23
Diluted (in dollars per share)	$ 0.46	$ 0.58	$ 0.50	$ 1.61	$ 1.20
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	61,727,030	46,053,077	39,709,565	51,282,533	35,652,626
Diluted (in shares)	62,361,804	46,702,968	40,486,114	51,965,647	36,455,945
Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income	$ 874	$ 1,057	$ 946	$ 3,081	$ 2,153
Other service fee income
NONINTEREST INCOME
Noninterest income	317	169	851	632	1,725
Debit card interchange fee income
NONINTEREST INCOME
Noninterest income	$ 1,061	$ 1,090	$ 248	$ 3,187	$ 994