Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
INTEREST INCOME:
Interest and fees on loans	$ 66,879	$ 65,932	$ 133,314	$ 128,927
Interest on investment securities:
Taxable	11,449	14,029	21,712	28,684
Exempt from federal income tax	14,060	12,149	27,809	21,844
Interest on federal funds sold and interest-bearing demand deposits in banks	214	87	377	842
Total interest income	92,602	92,197	183,212	180,297
INTEREST EXPENSE:
Interest on deposits	1,560	2,550	3,255	9,230
Other	93	412	184	929
Total interest expense	1,653	2,962	3,439	10,159
Net interest income	90,949	89,235	179,773	170,138
PROVISION FOR CREDIT LOSSES	(1,206)	8,700	(3,203)	18,550
Net interest income after provisions for credit losses	92,155	80,535	182,976	151,588
NONINTEREST INCOME:
Trust fees	8,692	6,961	16,991	14,398
Service charges on deposit accounts	4,928	4,318	9,721	10,233
ATM, interchange and credit card fees	9,853	8,049	18,530	15,449
Gain on sale and fees on mortgage loans	8,291	13,676	18,185	17,528
Net gain on sale of available-for-sale securities	5	1,512	813	3,574
Net gain on sale of foreclosed assets	1	52	56	53
Net gain (loss) on sale of assets	74	(24)	219	92
Interest on loan recoveries	704	154	1,086	419
Other	2,125	2,221	3,947	3,905
Total noninterest income	34,673	36,919	69,548	65,651
NONINTEREST EXPENSE:
Salaries, commissions and employee benefits	35,046	30,814	69,977	60,456
Net occupancy expense	3,241	3,101	6,388	6,128
Equipment expense	2,177	2,010	4,341	4,085
FDIC insurance premiums	766	463	1,467	508
ATM, interchange and credit card expenses	3,039	2,610	5,811	5,595
Professional and service fees	2,392	2,497	4,531	5,090
Printing, stationery and supplies	489	533	814	1,099
Operational and other losses	534	728	821	1,304
Software amortization and expense	2,829	2,010	5,448	4,034
Amortization of intangible assets	412	508	824	1,017
Other	8,449	8,047	16,676	19,324
Total noninterest expense	59,374	53,321	117,098	108,640
EARNINGS BEFORE INCOME TAXES	67,454	64,133	135,426	108,599
INCOME TAX EXPENSE	11,075	10,663	22,129	17,898
NET EARNINGS	$ 56,379	$ 53,470	$ 113,297	$ 90,701
NET EARNINGS PER SHARE, BASIC	$ 0.40	$ 0.38	$ 0.80	$ 0.64
NET EARNINGS PER SHARE, DILUTED	0.39	0.38	0.79	0.64
DIVIDENDS PER SHARE	$ 0.15	$ 0.13	$ 0.28	$ 0.25