Consolidated Statements of Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME:
Interest and fees on loans	$ 296,114	$ 271,638	$ 263,320
Interest on investment securities:
Taxable	78,924	47,390	51,456
Exempt from federal income tax	54,121	56,638	48,399
Interest on federal funds sold and interest-bearing deposits in banks	3,695	739	953
Total interest income	432,854	376,405	364,128
INTEREST EXPENSE:
Interest on deposits	26,246	5,705	13,118
Interest on borrowings	5,194	337	1,125
Total interest expense	31,440	6,042	14,243
Net interest income	401,414	370,363	349,885
PROVISION FOR CREDIT LOSSES	17,427	(1,139)	19,517
Net interest income after provisions for credit losses	383,987	371,502	330,368
NONINTEREST INCOME:
Trust fees	39,995	36,145	29,531
Service charges on deposit accounts	24,540	21,156	20,572
Debit card fees	30,280	35,905	30,298
Credit card fees	2,585	2,373	2,171
Gain on sale and fees on mortgage loans	19,035	33,245	43,872
Net gain on sale of available-for-sale securities	2,144	815	3,633
Net gain on sale of foreclosed assets	1,451	190	159
Net gain on sale of assets	520	210	112
Interest on loan recoveries	2,840	4,039	856
Other	8,275	8,098	8,731
Total noninterest income	131,665	142,176	139,935
NONINTEREST EXPENSE:
Salaries, commissions and employee benefits	134,133	142,042	135,123
Net occupancy expense	13,307	13,009	12,388
Equipment expense	9,052	9,173	8,396
FDIC insurance premiums	3,711	3,130	1,758
Debit card expense	12,231	11,957	11,215
Professional and service fees	8,770	9,334	9,346
Printing, stationery and supplies	2,114	1,910	2,163
Operational and other losses	3,229	3,293	2,462
Software amortization and expense	9,963	11,120	8,862
Amortization of intangible assets	1,245	1,613	1,990
Other	37,023	35,127	34,235
Total noninterest expense	234,778	241,708	227,938
EARNINGS BEFORE INCOME TAXES	280,874	271,970	242,365
INCOME TAX EXPENSE	46,399	44,408	40,331
NET EARNINGS	$ 234,475	$ 227,562	$ 202,034
NET EARNINGS PER SHARE, BASIC	$ 1.64	$ 1.60	$ 1.42
NET EARNINGS PER SHARE, DILUTED	1.64	1.59	1.42
DIVIDENDS PER SHARE	$ 0.66	$ 0.58	$ 0.51