Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
INTEREST INCOME:
Interest and fees on loans	$ 62,995	$ 53,232
Interest on investment securities:
Taxable	14,655	13,289
Exempt from federal income tax	9,694	9,763
Interest on federal funds sold and interest-bearing deposits in banks	756	617
Total interest income	88,100	76,901
INTEREST EXPENSE:
Interest on deposits	6,681	6,661
Other	517	726
Total interest expense	7,198	7,387
Net interest income	80,902	69,514
PROVISION FOR LOAN LOSSES	9,850	965
Net interest income after provision for loan losses	71,052	68,549
NONINTEREST INCOME:
Trust fees	7,437	6,979
Service charges on deposit accounts	5,915	5,176
ATM, interchange and credit card fees	7,400	6,840
Real estate mortgage operations	3,852	3,474
Net gain on sale of available-for-sale securities (includes $2,062 and $- for the three months ended March 31, 2020 and 2019, respectively, related to accumulated other comprehensive earnings reclassifications)	2,062	0
Net gain on sale of foreclosed assets	1	69
Net gain on sale of assets	116	0
Interest on loan recoveries	265	338
Other	1,684	1,561
Total noninterest income	28,732	24,437
NONINTEREST EXPENSE:
Salaries and employee benefits	29,642	27,424
Net occupancy expense	3,027	2,763
Equipment expense	2,075	2,453
FDIC insurance premiums	45	538
ATM, interchange and credit card expenses	2,985	2,383
Professional and service fees	2,594	1,832
Printing, stationery and supplies	566	366
Operational and other losses	576	266
Software amortization and expense	2,024	1,597
Amortization of intangible assets	509	269
Other	11,275	7,476
Total noninterest expense	55,318	47,367
EARNINGS BEFORE INCOME TAXES	44,466	45,619
INCOME TAX EXPENSE (includes $433 and $- for the three months ended March 31, 2020 and 2019, respectively, related to income tax expense reclassification)	7,234	7,367
NET EARNINGS	$ 37,232	$ 38,252
EARNINGS PER SHARE, BASIC	$ 0.26	$ 0.28
EARNINGS PER SHARE, ASSUMING DILUTION	0.26	0.28
DIVIDENDS PER SHARE	$ 0.12	$ 0.11