Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST INCOME:
Interest and fees on loans	$ 66,435	$ 62,995
Interest on investment securities:
Taxable	10,264	14,655
Exempt from federal income tax	13,749	9,694
Interest on federal funds sold and interest-bearing demand deposits in banks	162	756
Total interest income	90,610	88,100
INTEREST EXPENSE:
Interest on deposits	1,695	6,681
Other	91	517
Total interest expense	1,786	7,198
Net interest income	88,824	80,902
PROVISION FOR CREDIT LOSSES	(1,997)	9,850
Net interest income after provisions for credit losses	90,821	71,052
NONINTEREST INCOME:
Trust fees	8,299	7,437
Service charges on deposit accounts	4,793	5,915
ATM, interchange and credit card fees	8,677	7,400
Gain on sale and fees on mortgage loans	9,894	3,852
Net gain on sale of available-for-sale securities	808	2,062
Net gain on sale of foreclosed assets	55	1
Net gain on sale of assets	145	116
Interest on loan recoveries	382	265
Other	1,821	1,684
Total noninterest income	34,874	28,732
NONINTEREST EXPENSE:
Salaries, commissions and employee benefits	34,931	29,642
Net occupancy expense	3,147	3,027
Equipment expense	2,164	2,075
FDIC insurance premiums	701	45
ATM, interchange and credit card expenses	2,772	2,985
Professional and service fees	2,139	2,594
Printing, stationery and supplies	325	566
Operational and other losses	287	576
Software amortization and expense	2,619	2,024
Amortization of intangible assets	412	509
Other	8,226	11,275
Total noninterest expense	57,723	55,318
EARNINGS BEFORE INCOME TAXES	67,972	44,466
INCOME TAX EXPENSE	11,054	7,234
NET EARNINGS	$ 56,918	$ 37,232
NET EARNINGS PER SHARE, BASIC	$ 0.40	$ 0.26
NET EARNINGS PER SHARE, DILUTED	0.40	0.26
DIVIDENDS PER SHARE	$ 0.13	$ 0.12