CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest and dividend income:
Loans	$ 179,261	$ 182,834	$ 353,048	$ 362,807
Investment securities	26,491	18,192	49,738	32,512
Money market investments and interest-bearing cash accounts	2,873	433	3,693	782
Total interest and dividend income	208,625	201,459	406,479	396,101
Interest expense:
Deposits	7,694	10,782	15,346	23,124
Securities sold under agreements to repurchase	1,972	2,543	4,154	4,821
Advances from FHLB	1,075	2,066	2,138	4,529
Other borrowings	1,698	1,285	3,031	2,579
Total interest expense	12,439	16,676	24,669	35,053
Net interest income	196,186	184,783	381,810	361,048
Provision for credit losses - expense (benefit):
Loans and finance leases	12,665	(26,302)	(4,324)	(40,745)
Provision for credit losses - expense (benefit)	10,003	(26,155)	(3,799)	(41,407)
Net interest income after provision for credit losses	186,183	210,938	385,609	402,455
Non-interest income:
Service charges and fees on deposit accounts	9,466	8,788	18,829	17,092
Mortgage banking activities	4,082	6,404	9,288	13,677
Insurance commission income	2,946	2,215	8,221	7,456
Other non-interest income	14,447	12,477	27,461	22,615
Total non-interest income	30,941	29,884	63,799	60,840
Non-interest expenses:
Employees' compensation and benefits	51,304	49,714	100,858	100,556
Occupancy and equipment	21,505	24,116	43,891	48,358
Business promotion	4,042	3,225	7,505	6,195
Professional service fees	12,036	16,764	22,630	34,465
Taxes, other than income taxes	4,689	5,576	9,707	11,775
FDIC deposit insurance	1,466	1,922	3,139	3,910
Net (gain) loss on OREO and OREO expenses	(1,485)	(139)	(2,205)	1,759
Credit and debit card processing expenses	5,843	6,795	9,964	11,073
Communications	1,978	2,407	4,129	4,869
Merger and restructuring costs	0	11,047	0	22,314
Other non-interest expenses	6,948	8,745	15,367	18,199
Total non-interest expenses	108,326	130,172	214,985	263,473
Income before income taxes	108,798	110,650	234,423	199,822
Income tax expense	34,103	40,092	77,128	68,114
Net income	74,695	70,558	157,295	131,708
Net income attributable to common stockholders	$ 74,695	$ 69,889	$ 157,295	$ 130,370
Net income per common share:
Basic	$ 0.38	$ 0.33	$ 0.80	$ 0.61
Diluted	$ 0.38	$ 0.33	$ 0.80	$ 0.60
Debt Securities [Member]
Provision for credit losses - expense (benefit):
Other credit losses	$ (3,474)	$ 1,816	$ (109)	$ 1,713
Unfunded Loan Commitment [Member]
Provision for credit losses - expense (benefit):
Other credit losses	$ 812	$ (1,669)	$ 634	$ (2,375)