CONSOLIDATED STATEMENTS OF INCOME/(LOSS) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
INTEREST INCOME
Loans	$ 133,339	$ 113,265	$ 121,860	$ 246,604	$ 243,336
Investment securities and other interest-earning assets	10,783	10,524	10,554	21,307	20,321
Total interest income	144,122	123,789	132,414	267,911	263,657
INTEREST EXPENSE
Deposits	9,655	10,487	15,991	20,142	29,275
FHLB advances and other borrowings	217	1,081	3,083	1,298	7,885
Subordinated debentures	3,958	3,046	2,699	7,004	4,450
Total interest expense	13,830	14,614	21,773	28,444	41,610
Net interest income before provision for credit losses	130,292	109,175	110,641	239,467	222,047
Provision for credit losses	160,635	25,454	334	186,089	1,860
Net interest (loss) income after provision for credit losses	(30,343)	83,721	110,307	53,378	220,187
NONINTEREST INCOME
Loan servicing fees	434	480	409	914	807
Earnings on bank-owned life insurance	1,314	1,336	851	2,650	1,761
Net (loss) gain from sales of loans	(2,032)	771	902	(1,261)	2,631
Net (loss) gain from sales of investment securities	(21)	7,760	212	7,739	639
Other income	2,653	1,754	1,001	4,407	2,461
Total noninterest income	6,898	14,475	6,324	21,373	14,005
NONINTEREST EXPENSE
Compensation and benefits	43,011	34,376	33,847	77,387	67,235
Premises and occupancy	9,487	8,168	7,517	17,655	15,052
Data processing	4,465	3,253	3,036	7,718	5,966
Other real estate owned operations, net	9	14	62	23	65
FDIC insurance premiums	846	367	740	1,213	1,540
Legal, audit and professional expense	3,094	3,126	3,545	6,220	6,543
Marketing expense	1,319	1,412	1,425	2,731	2,922
Office, telecommunications and postage expense	1,533	1,103	1,311	2,636	2,521
Loan expense	823	822	1,005	1,645	1,878
Deposit expense	4,958	4,988	3,668	9,946	7,251
Merger-related expense	39,346	1,724	5	41,070	660
Core deposit intangible (“CDI”) amortization	4,040	3,965	4,281	8,005	8,717
Other expense	3,039	3,313	3,494	6,352	7,163
Total noninterest expense	115,970	66,631	63,936	182,601	127,513
Net (loss) income before income taxes	(139,415)	31,565	52,695	(107,850)	106,679
Income tax (benefit) expense	(40,324)	5,825	14,168	(34,499)	29,434
Net (loss) income	$ (99,091)	$ 25,740	$ 38,527	$ (73,351)	$ 77,245
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ (1.41)	$ 0.43	$ 0.62	$ (1.14)	$ 1.24
Diluted (in dollars per share)	$ (1.41)	$ 0.43	$ 0.62	$ (1.14)	$ 1.23
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	70,425,027	59,007,191	61,308,046	64,716,109	61,645,940
Diluted (in shares)	70,425,027	59,189,717	61,661,773	64,716,109	61,980,133
Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income	$ 1,399	$ 1,715	$ 1,441	$ 3,114	$ 2,771
Other service fee income
NONINTEREST INCOME
Noninterest income	297	311	363	608	719
Debit card interchange fee income
NONINTEREST INCOME
Noninterest income	457	348	1,145	805	2,216
Trust administrative fees
NONINTEREST INCOME
Noninterest income	$ 2,397	$ 0	$ 0	$ 2,397	$ 0