CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
INTEREST INCOME
Loans	$ 577,558	$ 485,663	$ 415,410
Investment securities and other interest-earning assets	53,168	40,444	33,013
Total interest income	630,726	526,107	448,423
INTEREST EXPENSE
Deposits	34,336	58,297	37,653
FHLB advances and other borrowings	1,532	9,829	11,343
Subordinated debentures	20,647	10,680	6,716
Total interest expense	56,515	78,806	55,712
Net interest income before provision for credit losses	574,211	447,301	392,711
Provision for credit losses	191,816	5,719	8,253
Net interest income after provision for credit losses	382,395	441,582	384,458
NONINTEREST INCOME
Loan servicing income	2,028	1,840	1,445
Earnings on bank-owned life insurance	7,160	3,486	3,427
Net gain from sales of loans	8,609	6,642	10,759
Net gain from sales of investment securities	13,882	8,571	1,399
Other income	12,201	4,486	3,641
Total noninterest income	71,325	35,236	31,027
NONINTEREST EXPENSE
Compensation and benefits	180,452	139,187	129,886
Premises and occupancy	43,296	30,758	24,544
Data processing	20,491	12,301	13,412
Other real estate owned operations, net	1	160	4
FDIC insurance premiums	3,571	764	3,002
Legal and professional services	15,633	12,869	10,040
Marketing expense	5,891	6,402	6,151
Office expense	7,216	4,826	5,312
Loan expense	3,531	4,079	3,370
Deposit expense	19,700	15,266	9,916
Merger-related expense	49,129	656	18,454
Amortization of intangible assets	17,072	17,245	13,594
Other expense	15,136	14,552	12,220
Total noninterest expense	381,119	259,065	249,905
Net income before income taxes	72,601	217,753	165,580
Income tax expense	12,250	58,035	42,240
Net income	$ 60,351	$ 159,718	$ 123,340
EARNINGS PER SHARE
Basic (in dollars per share)	$ 0.75	$ 2.62	$ 2.29
Diluted (in dollars per share)	$ 0.75	$ 2.60	$ 2.26
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	79,209,560	60,339,714	53,963,047
Diluted (in shares)	79,506,274	60,692,281	54,613,057
Service charges on deposit accounts
NONINTEREST INCOME
Noninterest income	$ 6,712	$ 5,769	$ 5,128
Other service fee income
NONINTEREST INCOME
Noninterest income	1,554	1,438	902
Debit card interchange fee income
NONINTEREST INCOME
Noninterest income	2,526	3,004	4,326
Trust custodial account fees
NONINTEREST INCOME
Noninterest income	$ 16,653	$ 0	$ 0