CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
INTEREST INCOME
Loans	$ 122,974	$ 121,860	$ 119,271	$ 366,310	$ 289,069
Investment securities and other interest-earning assets	9,630	10,554	9,605	29,951	23,333
Total interest income	132,604	132,414	128,876	396,261	312,402
INTEREST EXPENSE
Deposits	15,878	15,991	11,942	45,153	25,612
FHLB advances and other borrowings	1,214	3,083	2,494	9,099	6,642
Subordinated debentures	3,177	2,699	1,727	7,627	4,983
Total interest expense	20,269	21,773	16,163	61,879	37,237
Net interest income before provision for credit losses	112,335	110,641	112,713	334,382	275,165
Provision for credit losses	1,562	334	1,981	3,422	5,995
Net interest income after provision for credit losses	110,773	110,307	110,732	330,960	269,170
NONINTEREST INCOME
Loan servicing fees	546	409	400	1,353	1,037
Earnings on bank-owned life insurance	861	851	1,270	2,622	2,498
Net gain from sales of loans	2,313	902	2,029	4,944	8,830
Net gain from sales of investment securities	4,261	212	1,063	4,900	1,399
Other income	1,228	1,001	530	3,689	2,697
Total noninterest income	11,430	6,324	8,240	25,435	24,057
NONINTEREST EXPENSE
Compensation and benefits	35,543	33,847	37,901	102,778	96,048
Premises and occupancy	7,593	7,517	7,214	22,645	17,040
Data processing	3,094	3,036	4,095	9,060	9,544
Other real estate owned operations, net	64	62	0	129	3
FDIC insurance premiums	(10)	740	1,060	1,530	2,252
Legal, audit and professional expense	3,058	3,545	3,280	9,601	6,935
Marketing expense	1,767	1,425	1,569	4,689	4,451
Office, telecommunications and postage expense	1,200	1,311	1,538	3,721	3,733
Loan expense	1,137	1,005	1,139	3,015	2,324
Deposit expense	3,478	3,668	2,833	10,729	6,811
Merger-related expense	(4)	5	13,978	656	15,857
Core deposit intangible (“CDI”) amortization	4,281	4,281	4,693	12,998	8,963
Other expense	4,135	3,494	3,482	11,298	8,705
Total noninterest expense	65,336	63,936	82,782	192,849	182,666
Net income before income taxes	56,867	52,695	36,190	163,546	110,561
Income tax	15,492	14,168	7,798	44,926	26,864
Net income	$ 41,375	$ 38,527	$ 28,392	$ 118,620	$ 83,697
EARNINGS PER SHARE
Basic (in dollars per share)	$ 0.69	$ 0.62	$ 0.46	$ 1.93	$ 1.63
Diluted (in dollars per share)	$ 0.69	$ 0.62	$ 0.46	$ 1.92	$ 1.61
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	59,293,218	61,308,046	61,727,030	60,853,081	51,282,533
Diluted (in shares)	59,670,855	61,661,773	62,361,804	61,201,858	51,965,647
Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income	$ 1,440	$ 1,441	$ 1,570	$ 4,211	$ 3,777
Other service fee income
NONINTEREST INCOME
Noninterest income	360	363	317	1,079	632
Debit card interchange fee income
NONINTEREST INCOME
Noninterest income	$ 421	$ 1,145	$ 1,061	$ 2,637	$ 3,187