LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Net Loans (Details) $ in Thousands	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 3,909,753		$ 3,634,792
Less: allowance for credit losses	(40,543)	$ (38,117)	(37,588)	$ (36,908)	$ (35,555)	$ (34,340)
Net loans receivable	3,869,210		3,597,204
Net deferred loan origination fees (costs) included in the above table	$ 4,513		$ 5,667
Percentage of Total	1.000		1.000
Farmland
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 31,649		$ 23,768
Less: allowance for credit losses	$ (191)	(186)	$ (151)	(124)	(224)	(221)
Percentage of Total	0.008		0.007
Owner-occupied, nonfarm nonresidential properties
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 463,922		$ 434,672
Less: allowance for credit losses	$ (3,714)	(3,595)	$ (3,339)	(2,880)	(2,935)	(3,700)
Percentage of Total	0.119		0.120
Agricultural production and other loans to farmers
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 1,097		$ 1,379
Less: allowance for credit losses	$ (7)	(10)	$ (9)	(12)	(28)	(24)
Percentage of Total	0.000		0.000
Commercial and Industrial
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 759,417		$ 708,989
Less: allowance for credit losses	$ (9,555)	(9,090)	$ (8,837)	(7,312)	(6,479)	(6,233)
Percentage of Total	0.194		0.195
Obligations (other than securities and leases) of states and political subdivisions
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 143,488		$ 140,887
Less: allowance for credit losses	$ (1,665)	(1,828)	$ (1,649)	(2,325)	(1,715)	(998)
Percentage of Total	0.037		0.039
Other loans
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 14,524		$ 13,979
Less: allowance for credit losses	$ (167)	(143)	$ (149)	(117)	(73)	(68)
Percentage of Total	0.004		0.004
Other construction loans and all land development and other land loans
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 341,399		$ 298,869
Less: allowance for credit losses	$ (2,328)	(2,050)	$ (2,198)	(2,364)	(2,006)	(1,956)
Percentage of Total	0.087		0.082
Multifamily (5 or more) residential properties
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 212,561		$ 216,143
Less: allowance for credit losses	$ (2,277)	(2,236)	$ (2,289)	(2,314)	(2,754)	(2,724)
Percentage of Total	0.055		0.059
Non-owner occupied, nonfarm nonresidential properties
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 734,580		$ 663,062
Less: allowance for credit losses	$ (6,748)	(6,411)	$ (6,481)	(10,162)	(11,326)	(8,658)
Percentage of Total	0.188		0.182
1-4 Family Construction
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 40,990		$ 37,822
Less: allowance for credit losses	$ (236)	(210)	$ (158)	(110)	(67)	(82)
Percentage of Total	0.010		0.010
Home equity lines of credit
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 115,836		$ 104,517
Less: allowance for credit losses	$ (1,353)	(1,181)	$ (1,169)	(1,029)	(843)	(985)
Percentage of Total	0.030		0.029
Residential Mortgages secured by first liens
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 875,974		$ 826,729
Less: allowance for credit losses	$ (7,664)	(6,905)	$ (6,943)	(4,398)	(3,550)	(4,539)
Percentage of Total	0.224		0.227
Residential Mortgages secured by junior liens
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 62,212		$ 56,689
Less: allowance for credit losses	$ (628)	(552)	$ (546)	(408)	(224)	(241)
Percentage of Total	0.016		0.016
Other revolving credit plans
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 28,768		$ 26,536
Less: allowance for credit losses	$ (598)	(547)	$ (528)	(459)	(527)	(507)
Percentage of Total	0.007		0.007
Automobile
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 20,166		$ 20,862
Less: allowance for credit losses	$ (242)	(254)	$ (263)	(241)	(182)	(132)
Percentage of Total	0.005		0.006
Other consumer
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 51,765		$ 49,676
Less: allowance for credit losses	$ (2,704)	(2,569)	$ (2,546)	(2,402)	(2,374)	(2,962)
Percentage of Total	0.013		0.014
Credit cards
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 11,049		$ 9,935
Less: allowance for credit losses	$ (110)	(103)	$ (92)	(68)	(65)	(66)
Percentage of Total	0.003		0.003
Overdrafts
Loan Portfolio By Loan Grade [Line Items]
Loans receivable	$ 356		$ 278
Less: allowance for credit losses	$ (356)	$ (247)	$ (241)	$ (183)	$ (183)	$ (244)
Percentage of Total	0.000		0.000