Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income:
Interest and fees on loans	$ 94,353	$ 62,648	$ 250,390	$ 194,295
Interest on debt securities:
Taxable	4,435	5,554	13,293	19,698
Nontaxable	3,585	2,241	10,058	5,542
Interest on interest-earning deposits	480	113	906	500
Dividends on equity securities	375	231	942	631
Total interest income	103,228	70,787	275,589	220,666
Interest expense:
Interest Expense, Deposits	2,740	3,712	7,870	17,983
Subordinated debentures and notes	2,855	2,826	8,521	7,061
FHLB advances	212	720	604	2,070
Notes payable and other borrowings	148	175	460	997
Total interest expense	5,955	7,433	17,455	28,111
Net interest income	97,273	63,354	258,134	192,555
Provision for credit losses	19,668	14,080	17,045	55,935
Net interest income after provision for credit losses	77,605	49,274	241,089	136,620
Noninterest income:
Total noninterest income	17,619	12,629	45,113	35,997
Noninterest expense:
Employee compensation and benefits	33,722	22,040	91,416	66,114
Occupancy	4,496	3,408	11,776	9,940
Data processing	3,328	2,167	9,068	6,393
Professional fees	901	755	3,189	2,904
Branch-closure expenses	3,441	0	3,441	0
Merger-related expenses	14,671	1,563	19,762	1,563
Other	16,326	9,591	43,573	29,195
Total noninterest expense	76,885	39,524	182,225	116,109
Income before income tax expense	18,339	22,379	103,977	56,508
Income tax expense	4,426	4,428	21,733	11,055
Net income	$ 13,913	$ 17,951	$ 82,244	$ 45,453
Earnings per common share
Basic (usd per share)	$ 0.38	$ 0.68	$ 2.48	$ 1.73
Diluted (usd per share)	$ 0.38	$ 0.68	$ 2.48	$ 1.73
Deposit Account [Member]
Noninterest income:
Total noninterest income	$ 4,520	$ 2,798	$ 11,466	$ 8,557
Fiduciary and Trust [Member]
Noninterest income:
Total noninterest income	2,573	2,456	7,572	7,283
Card Services Revenue [Member]
Noninterest income:
Total noninterest income	3,186	2,498	8,657	6,970
Tax credit activity, net [Member]
Noninterest income:
Total noninterest income	3,325	748	3,654	2,563
Financial Service, Other [Member]
Noninterest income:
Total noninterest income	$ 4,015	$ 4,129	$ 13,764	$ 10,624