LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Net Loans (Details) $ in Thousands	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 4,464,834		$ 4,275,178
Percentage of Total	1.000		1.000
Less: allowance for credit losses	$ (45,541)	$ (43,981)	$ (43,436)	$ (40,543)	$ (38,117)	$ (37,588)
Net loans receivable	4,419,293		4,231,742
Net deferred loan origination fees included in the above table	3,432		4,463
Farmland
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 33,774		$ 32,168
Percentage of Total	0.008		0.008
Less: allowance for credit losses	$ (140)	(129)	$ (159)	(191)	(186)	(151)
Owner-occupied, nonfarm nonresidential properties
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 490,728		$ 468,493
Percentage of Total	0.110		0.110
Less: allowance for credit losses	$ (3,151)	(2,546)	$ (2,905)	(3,714)	(3,595)	(3,339)
Agricultural production and other loans to farmers
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 1,135		$ 1,198
Percentage of Total	0		0
Less: allowance for credit losses	$ (5)	(3)	$ (6)	(7)	(10)	(9)
Commercial and Industrial
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 778,704		$ 791,911
Percentage of Total	0.174		0.185
Less: allowance for credit losses	$ (8,659)	(8,943)	$ (9,766)	(9,555)	(9,090)	(8,837)
Obligations (other than securities and leases) of states and political subdivisions
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 154,834		$ 145,345
Percentage of Total	0.035		0.034
Less: allowance for credit losses	$ (2,306)	(1,848)	$ (1,863)	(1,665)	(1,828)	(1,649)
Other loans
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 30,749		$ 24,710
Percentage of Total	0.007		0.006
Less: allowance for credit losses	$ (733)	(594)	$ (456)	(167)	(143)	(149)
Other construction loans and all land development and other land loans
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 451,043		$ 446,685
Percentage of Total	0.101		0.105
Less: allowance for credit losses	$ (3,591)	(3,394)	$ (3,253)	(2,328)	(2,050)	(2,198)
Multifamily (5 or more) residential properties
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 276,829		$ 257,696
Percentage of Total	0.062		0.060
Less: allowance for credit losses	$ (1,613)	(2,535)	$ (2,353)	(2,277)	(2,236)	(2,289)
Non-owner occupied, nonfarm nonresidential properties
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 881,550		$ 795,315
Percentage of Total	0.197		0.186
Less: allowance for credit losses	$ (8,977)	(8,259)	$ (7,653)	(6,748)	(6,411)	(6,481)
1-4 Family Construction
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 59,735		$ 51,171
Percentage of Total	0.013		0.012
Less: allowance for credit losses	$ (408)	(398)	$ (327)	(236)	(210)	(158)
Home equity lines of credit
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 121,813		$ 124,892
Percentage of Total	0.027		0.029
Less: allowance for credit losses	$ (969)	(1,158)	$ (1,173)	(1,353)	(1,181)	(1,169)
Residential Mortgages secured by first liens
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 967,807		$ 942,531
Percentage of Total	0.217		0.220
Less: allowance for credit losses	$ (9,250)	(8,851)	$ (8,484)	(7,664)	(6,905)	(6,943)
Residential Mortgages secured by junior liens
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 87,985		$ 74,638
Percentage of Total	0.020		0.017
Less: allowance for credit losses	$ (1,578)	(1,275)	$ (1,035)	(628)	(552)	(546)
Other revolving credit plans
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 41,774		$ 36,372
Percentage of Total	0.009		0.009
Less: allowance for credit losses	$ (931)	(830)	$ (722)	(598)	(547)	(528)
Automobile
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 26,753		$ 21,806
Percentage of Total	0.006		0.005
Less: allowance for credit losses	$ (376)	(330)	$ (271)	(242)	(254)	(263)
Other consumer
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 47,760		$ 49,144
Percentage of Total	0.011		0.011
Less: allowance for credit losses	$ (2,561)	(2,561)	$ (2,665)	(2,704)	(2,569)	(2,546)
Credit cards
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 11,640		$ 10,825
Percentage of Total	0.003		0.003
Less: allowance for credit losses	$ (72)	(73)	$ (67)	(110)	(103)	(92)
Overdrafts
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 221		$ 278
Percentage of Total	0		0
Less: allowance for credit losses	$ (221)	$ (254)	$ (278)	$ (356)	$ (247)	$ (241)