LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Amortized Cost Basis of Loans by Credit Quality Indicator and Class of Loans Based on the Most Recent Analysis Performed (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Recorded Investment [Line Items]
Year one	$ 602,319		$ 602,319		$ 689,932
Current period gross writeoffs, year one			94		245
Year two	650,738		650,738		1,332,165
Current period gross writeoffs, year two			359		637
Year three	1,264,559		1,264,559		905,776
Current period gross writeoffs, year three			698		641
Year four	815,935		815,935		560,460
Current period gross writeoffs, year four			394		318
Year five	502,999		502,999		368,126
Current period gross writeoffs, year five			69		362
More than five years	1,066,351		1,066,351		859,287
Current period gross writeoffs, prior			1,276		768
Revolving Loans	415,689		415,689		454,296
Current period gross writeoffs, revolving			32		121
Loans held for investment	5,318,590		5,318,590		5,170,042
Loans charged-off	1,386	$ 629	2,922	$ 2,095	3,092
Commercial, financial and agriculture
Financing Receivable, Recorded Investment [Line Items]
Year one	92,130		92,130		102,714
Current period gross writeoffs, year one			0		14
Year two	90,305		90,305		150,750
Current period gross writeoffs, year two			70		51
Year three	111,268		111,268		113,608
Current period gross writeoffs, year three			159		225
Year four	89,408		89,408		47,639
Current period gross writeoffs, year four			287		139
Year five	36,735		36,735		37,412
Current period gross writeoffs, year five			11		206
More than five years	83,055		83,055		65,917
Current period gross writeoffs, prior			305		110
Revolving Loans	245,763		245,763		282,284
Current period gross writeoffs, revolving			0		0
Loans held for investment	748,664		748,664		800,324
Loans charged-off	404	48	832	472	745
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	355,412		355,412		386,090
Current period gross writeoffs, year one			0		0
Year two	393,692		393,692		833,458
Current period gross writeoffs, year two			0		0
Year three	838,251		838,251		565,253
Current period gross writeoffs, year three			0		193
Year four	522,474		522,474		380,762
Current period gross writeoffs, year four			20		0
Year five	345,273		345,273		268,718
Current period gross writeoffs, year five			0		0
More than five years	777,100		777,100		618,477
Current period gross writeoffs, prior			71		57
Revolving Loans	3,364		3,364		6,397
Current period gross writeoffs, revolving			0		0
Loans held for investment	3,235,566		3,235,566		3,059,155
Loans charged-off	0	27	91	27	250
Consumer real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	141,785		141,785		176,646
Current period gross writeoffs, year one			0		5
Year two	154,191		154,191		335,541
Current period gross writeoffs, year two			0		19
Year three	307,540		307,540		219,582
Current period gross writeoffs, year three			357		0
Year four	199,182		199,182		129,098
Current period gross writeoffs, year four			0		0
Year five	119,336		119,336		60,772
Current period gross writeoffs, year five			0		0
More than five years	204,765		204,765		173,698
Current period gross writeoffs, prior			18		25
Revolving Loans	160,345		160,345		157,458
Current period gross writeoffs, revolving			0		0
Loans held for investment	1,287,144		1,287,144		1,252,795
Loans charged-off	81	21	375	45	49
Consumer installment
Financing Receivable, Recorded Investment [Line Items]
Year one	12,992		12,992		24,482
Current period gross writeoffs, year one			94		226
Year two	12,550		12,550		12,416
Current period gross writeoffs, year two			289		567
Year three	7,500		7,500		7,333
Current period gross writeoffs, year three			182		223
Year four	4,871		4,871		2,961
Current period gross writeoffs, year four			87		179
Year five	1,655		1,655		1,224
Current period gross writeoffs, year five			58		156
More than five years	1,431		1,431		1,195
Current period gross writeoffs, prior			882		576
Revolving Loans	6,217		6,217		8,157
Current period gross writeoffs, revolving			32		121
Loans held for investment	47,216		47,216		57,768
Loans charged-off	901	$ 533	1,624	$ 1,551	2,048
Pass
Financing Receivable, Recorded Investment [Line Items]
Year one	599,959		599,959		688,843
Year two	645,868		645,868		1,322,389
Year three	1,245,629		1,245,629		898,616
Year four	802,618		802,618		554,856
Year five	493,532		493,532		350,639
More than five years	996,495		996,495		798,107
Revolving Loans	406,606		406,606		450,020
Loans held for investment	5,190,707		5,190,707		5,063,470
Pass | Commercial, financial and agriculture
Financing Receivable, Recorded Investment [Line Items]
Year one	92,130		92,130		102,263
Year two	88,294		88,294		150,420
Year three	110,651		110,651		113,487
Year four	88,411		88,411		47,313
Year five	34,074		34,074		36,065
More than five years	80,766		80,766		64,020
Revolving Loans	240,163		240,163		281,646
Loans held for investment	734,489		734,489		795,214
Pass | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	353,455		353,455		385,954
Year two	392,267		392,267		825,505
Year three	824,061		824,061		558,742
Year four	512,024		512,024		377,085
Year five	340,788		340,788		253,746
More than five years	720,312		720,312		569,428
Revolving Loans	3,364		3,364		6,397
Loans held for investment	3,146,271		3,146,271		2,976,857
Pass | Consumer real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	141,382		141,382		176,144
Year two	152,809		152,809		334,056
Year three	303,506		303,506		219,071
Year four	197,321		197,321		127,539
Year five	117,042		117,042		59,615
More than five years	193,986		193,986		163,464
Revolving Loans	156,879		156,879		153,821
Loans held for investment	1,262,925		1,262,925		1,233,710
Pass | Consumer installment
Financing Receivable, Recorded Investment [Line Items]
Year one	12,992		12,992		24,482
Year two	12,498		12,498		12,408
Year three	7,411		7,411		7,316
Year four	4,862		4,862		2,919
Year five	1,628		1,628		1,213
More than five years	1,431		1,431		1,195
Revolving Loans	6,200		6,200		8,156
Loans held for investment	47,022		47,022		57,689
Special mention
Financing Receivable, Recorded Investment [Line Items]
Year one	1,374		1,374		0
Year two	1,155		1,155		1,741
Year three	1,925		1,925		6,118
Year four	6,953		6,953		3,252
Year five	5,324		5,324		10,985
More than five years	22,405		22,405		25,897
Revolving Loans	5,618		5,618		422
Loans held for investment	44,754		44,754		48,415
Special mention | Commercial, financial and agriculture
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	1,103		1,103		0
Year three	73		73		0
Year four	628		628		141
Year five	2,368		2,368		797
More than five years	759		759		3
Revolving Loans	4,933		4,933		10
Loans held for investment	9,864		9,864		951
Special mention | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	1,374		1,374		0
Year two	0		0		660
Year three	1,340		1,340		6,118
Year four	5,827		5,827		3,111
Year five	2,929		2,929		9,545
More than five years	19,831		19,831		22,648
Revolving Loans	0		0		0
Loans held for investment	31,301		31,301		42,082
Special mention | Consumer real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	0		0		1,081
Year three	423		423		0
Year four	489		489		0
Year five	0		0		643
More than five years	1,815		1,815		3,246
Revolving Loans	668		668		412
Loans held for investment	3,395		3,395		5,382
Special mention | Consumer installment
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	52		52		0
Year three	89		89		0
Year four	9		9		0
Year five	27		27		0
More than five years	0		0		0
Revolving Loans	17		17		0
Loans held for investment	194		194		0
Substandard
Financing Receivable, Recorded Investment [Line Items]
Year one	986		986		1,089
Year two	3,715		3,715		8,035
Year three	17,005		17,005		1,042
Year four	6,364		6,364		2,352
Year five	4,143		4,143		6,502
More than five years	47,451		47,451		35,283
Revolving Loans	3,465		3,465		3,854
Loans held for investment	83,129		83,129		58,157
Substandard | Commercial, financial and agriculture
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		451
Year two	908		908		330
Year three	544		544		121
Year four	369		369		185
Year five	293		293		550
More than five years	1,530		1,530		1,894
Revolving Loans	667		667		628
Loans held for investment	4,311		4,311		4,159
Substandard | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	583		583		136
Year two	1,425		1,425		7,293
Year three	12,850		12,850		393
Year four	4,623		4,623		566
Year five	1,556		1,556		5,427
More than five years	36,957		36,957		26,401
Revolving Loans	0		0		0
Loans held for investment	57,994		57,994		40,216
Substandard | Consumer real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	403		403		502
Year two	1,382		1,382		404
Year three	3,611		3,611		511
Year four	1,372		1,372		1,559
Year five	2,294		2,294		514
More than five years	8,964		8,964		6,988
Revolving Loans	2,798		2,798		3,225
Loans held for investment	20,824		20,824		13,703
Substandard | Consumer installment
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	0		0		8
Year three	0		0		17
Year four	0		0		42
Year five	0		0		11
More than five years	0		0		0
Revolving Loans	0		0		1
Loans held for investment	0		0		79
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving Loans	0		0		0
Loans held for investment	0		0		0
Doubtful | Commercial, financial and agriculture
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving Loans	0		0		0
Loans held for investment	0		0		0
Doubtful | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving Loans	0		0		0
Loans held for investment	0		0		0
Doubtful | Consumer real estate
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving Loans	0		0		0
Loans held for investment	0		0		0
Doubtful | Consumer installment
Financing Receivable, Recorded Investment [Line Items]
Year one	0		0		0
Year two	0		0		0
Year three	0		0		0
Year four	0		0		0
Year five	0		0		0
More than five years	0		0		0
Revolving Loans	0		0		0
Loans held for investment	$ 0		$ 0		$ 0