CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
INTEREST INCOME
Loans	$ 121,860	$ 121,476	$ 85,625	$ 243,336	$ 169,798
Investment securities and other interest-earning assets	10,554	9,767	7,074	20,321	13,728
Total interest income	132,414	131,243	92,699	263,657	183,526
INTEREST EXPENSE
Deposits	15,991	13,284	7,756	29,275	13,670
FHLB advances and other borrowings	3,083	4,802	2,125	7,885	4,148
Subordinated debentures	2,699	1,751	1,647	4,450	3,256
Total interest expense	21,773	19,837	11,528	41,610	21,074
Net interest income before provision for credit losses	110,641	111,406	81,171	222,047	162,452
Provision for credit losses	334	1,526	1,761	1,860	4,014
Net interest income after provision for credit losses	110,307	109,880	79,410	220,187	158,438
NONINTEREST INCOME
Loan servicing fees	409	398	292	807	637
Earnings on bank-owned life insurance	851	910	617	1,761	1,228
Net gain from sales of loans	902	1,729	3,843	2,631	6,801
Net gain from sales of investment securities	212	427	330	639	336
Other income	1,001	1,460	753	2,461	2,167
Total noninterest income	6,324	7,681	8,151	14,005	15,817
NONINTEREST EXPENSE
Compensation and benefits	33,847	33,388	29,274	67,235	58,147
Premises and occupancy	7,517	7,535	5,045	15,052	9,826
Data processing	3,036	2,930	2,747	5,966	5,449
Other real estate owned operations, net	62	3	2	65	3
FDIC insurance premiums	740	800	581	1,540	1,192
Legal, audit and professional expense	3,545	2,998	1,816	6,543	3,655
Marketing expense	1,425	1,497	1,352	2,922	2,882
Office, telecommunications and postage expense	1,311	1,210	1,115	2,521	2,195
Loan expense	1,005	873	594	1,878	1,185
Deposit expense	3,668	3,583	2,302	7,251	3,978
Merger-related expense	5	655	943	660	1,879
Core deposit intangible (“CDI”) amortization	4,281	4,436	1,996	8,717	4,270
Other expense	3,494	3,669	2,309	7,163	5,223
Total noninterest expense	63,936	63,577	50,076	127,513	99,884
Net income before income taxes	52,695	53,984	37,485	106,679	74,371
Income tax	14,168	15,266	10,182	29,434	19,066
Net income	$ 38,527	$ 38,718	$ 27,303	$ 77,245	$ 55,305
EARNINGS PER SHARE
Basic (in dollars per share)	$ 0.62	$ 0.62	$ 0.59	$ 1.24	$ 1.20
Diluted (in dollars per share)	$ 0.62	$ 0.62	$ 0.58	$ 1.23	$ 1.18
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	61,308,046	61,987,605	46,053,077	61,645,940	45,973,727
Diluted (in shares)	61,661,773	62,285,783	46,702,968	61,980,133	46,678,123
Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income	$ 1,441	$ 1,330	$ 1,057	$ 2,771	$ 2,207
Other service fee income
NONINTEREST INCOME
Noninterest income	363	356	169	719	315
Debit card interchange fee income
NONINTEREST INCOME
Noninterest income	$ 1,145	$ 1,071	$ 1,090	$ 2,216	$ 2,126