LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Risk Rating (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 4,492,174	$ 4,275,178
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,966,378	2,872,117
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	73,079	48,583
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	54,019	41,508
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,191	1,313
Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,088	12,321
One fiscal year before current year	11,601	7,982
Two fiscal years before current year	7,627	1,536
Three fiscal years before current year	1,474	871
Four fiscal years before current year	831	3,419
More than four fiscal years before current year	7,733	5,496
Revolving Loans Amortized Cost Basis	440	543
Revolving Loans Converted to Term	0	0
Total	32,794	32,168
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Farmland | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,088	12,321
One fiscal year before current year	11,601	7,635
Two fiscal years before current year	7,321	1,536
Three fiscal years before current year	1,474	871
Four fiscal years before current year	831	3,277
More than four fiscal years before current year	6,928	3,523
Revolving Loans Amortized Cost Basis	440	543
Revolving Loans Converted to Term	0	0
Total	31,683	29,706
Farmland | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	182	1,450
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	182	1,450
Farmland | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	347
Two fiscal years before current year	306	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	142
More than four fiscal years before current year	623	523
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	929	1,012
Farmland | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	54,399	120,103
One fiscal year before current year	124,917	113,575
Two fiscal years before current year	107,450	66,194
Three fiscal years before current year	59,195	57,776
Four fiscal years before current year	53,770	30,286
More than four fiscal years before current year	81,199	65,773
Revolving Loans Amortized Cost Basis	13,596	14,786
Revolving Loans Converted to Term	0	0
Total	494,526	468,493
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	26
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	26
Owner-occupied, nonfarm nonresidential properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	54,399	116,701
One fiscal year before current year	121,809	113,575
Two fiscal years before current year	105,563	50,226
Three fiscal years before current year	45,267	55,040
Four fiscal years before current year	46,542	25,327
More than four fiscal years before current year	77,245	60,810
Revolving Loans Amortized Cost Basis	10,245	11,788
Revolving Loans Converted to Term	0	0
Total	461,070	433,467
Owner-occupied, nonfarm nonresidential properties | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	3,402
One fiscal year before current year	3,108	0
Two fiscal years before current year	1,191	15,613
Three fiscal years before current year	13,620	872
Four fiscal years before current year	412	4,097
More than four fiscal years before current year	334	814
Revolving Loans Amortized Cost Basis	3,181	2,998
Revolving Loans Converted to Term	0	0
Total	21,846	27,796
Owner-occupied, nonfarm nonresidential properties | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	696	355
Three fiscal years before current year	308	1,864
Four fiscal years before current year	6,816	862
More than four fiscal years before current year	3,620	4,149
Revolving Loans Amortized Cost Basis	170	0
Revolving Loans Converted to Term	0	0
Total	11,610	7,230
Owner-occupied, nonfarm nonresidential properties | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Agricultural production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	81	105
One fiscal year before current year	44	140
Two fiscal years before current year	92	80
Three fiscal years before current year	68	42
Four fiscal years before current year	5	179
More than four fiscal years before current year	162	0
Revolving Loans Amortized Cost Basis	666	652
Revolving Loans Converted to Term	0	0
Total	1,118	1,198
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Agricultural production and other loans to farmers | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	81	105
One fiscal year before current year	44	140
Two fiscal years before current year	92	80
Three fiscal years before current year	68	42
Four fiscal years before current year	5	179
More than four fiscal years before current year	162	0
Revolving Loans Amortized Cost Basis	666	652
Revolving Loans Converted to Term	0	0
Total	1,118	1,198
Agricultural production and other loans to farmers | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Agricultural production and other loans to farmers | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Agricultural production and other loans to farmers | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	68,653	196,495
One fiscal year before current year	155,139	216,555
Two fiscal years before current year	167,323	59,075
Three fiscal years before current year	44,760	17,382
Four fiscal years before current year	11,314	9,456
More than four fiscal years before current year	20,775	20,074
Revolving Loans Amortized Cost Basis	262,578	272,874
Revolving Loans Converted to Term	0	0
Total	730,542	791,911
Current period gross write offs
2023	50
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	76
Revolving Loans Converted to Term	0
Total	126
Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	68,653	195,955
One fiscal year before current year	147,302	213,433
Two fiscal years before current year	160,124	51,695
Three fiscal years before current year	37,836	16,730
Four fiscal years before current year	7,759	9,051
More than four fiscal years before current year	18,437	19,116
Revolving Loans Amortized Cost Basis	243,719	259,841
Revolving Loans Converted to Term	0	0
Total	683,830	765,821
Commercial and Industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	241
One fiscal year before current year	7,584	0
Two fiscal years before current year	3,180	6,691
Three fiscal years before current year	6,310	273
Four fiscal years before current year	58	81
More than four fiscal years before current year	20	45
Revolving Loans Amortized Cost Basis	13,772	7,409
Revolving Loans Converted to Term	0	0
Total	30,924	14,740
Commercial and Industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	299
One fiscal year before current year	253	1,809
Two fiscal years before current year	2,828	689
Three fiscal years before current year	614	379
Four fiscal years before current year	3,497	324
More than four fiscal years before current year	2,318	913
Revolving Loans Amortized Cost Basis	5,087	5,624
Revolving Loans Converted to Term	0	0
Total	14,597	10,037
Commercial and Industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	1,313
Two fiscal years before current year	1,191	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	1,191	1,313
Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	23,561	20,840
One fiscal year before current year	16,969	37,527
Two fiscal years before current year	32,123	13,868
Three fiscal years before current year	12,556	4,584
Four fiscal years before current year	4,276	13,518
More than four fiscal years before current year	59,793	50,050
Revolving Loans Amortized Cost Basis	4,444	4,958
Revolving Loans Converted to Term	0	0
Total	153,722	145,345
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Obligations (other than securities and leases) of states and political subdivisions | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	23,561	20,840
One fiscal year before current year	16,969	37,527
Two fiscal years before current year	32,123	13,868
Three fiscal years before current year	12,556	4,584
Four fiscal years before current year	4,276	13,518
More than four fiscal years before current year	46,460	50,050
Revolving Loans Amortized Cost Basis	4,444	4,958
Revolving Loans Converted to Term	0	0
Total	140,389	145,345
Obligations (other than securities and leases) of states and political subdivisions | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	13,333	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	13,333	0
Obligations (other than securities and leases) of states and political subdivisions | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Obligations (other than securities and leases) of states and political subdivisions | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,065	14,248
One fiscal year before current year	12,099	5,358
Two fiscal years before current year	5,307	2,278
Three fiscal years before current year	1,925	363
Four fiscal years before current year	296	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	20,390	2,463
Revolving Loans Converted to Term	0	0
Total	43,082	24,710
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Other loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	3,065	14,248
One fiscal year before current year	12,099	5,358
Two fiscal years before current year	5,307	2,278
Three fiscal years before current year	1,925	363
Four fiscal years before current year	296	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	20,390	2,463
Revolving Loans Converted to Term	0	0
Total	43,082	24,710
Other loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Other loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Other loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Other construction loans and all land development and other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	81,675	273,414
One fiscal year before current year	245,946	88,917
Two fiscal years before current year	97,364	56,782
Three fiscal years before current year	20,642	6,918
Four fiscal years before current year	7,927	8,644
More than four fiscal years before current year	1,380	916
Revolving Loans Amortized Cost Basis	6,997	11,094
Revolving Loans Converted to Term	0	0
Total	461,931	446,685
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	0
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	0
Other construction loans and all land development and other land loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	81,675	272,118
One fiscal year before current year	240,639	86,894
Two fiscal years before current year	97,364	56,782
Three fiscal years before current year	20,642	6,918
Four fiscal years before current year	6,378	8,644
More than four fiscal years before current year	1,380	916
Revolving Loans Amortized Cost Basis	6,933	11,028
Revolving Loans Converted to Term	0	0
Total	455,011	443,300
Other construction loans and all land development and other land loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	1,296
One fiscal year before current year	5,307	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	5,307	1,296
Other construction loans and all land development and other land loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	2,023
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	1,549	0
More than four fiscal years before current year	0	0
Revolving Loans Amortized Cost Basis	64	66
Revolving Loans Converted to Term	0	0
Total	1,613	2,089
Other construction loans and all land development and other land loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Multifamily (5 or more) residential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	40,810	115,097
One fiscal year before current year	96,888	49,794
Two fiscal years before current year	44,058	46,784
Three fiscal years before current year	44,901	11,854
Four fiscal years before current year	11,167	7,097
More than four fiscal years before current year	29,659	24,441
Revolving Loans Amortized Cost Basis	949	2,629
Revolving Loans Converted to Term	0	0
Total	268,432	257,696
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	0
Prior	65
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term	0
Total	65
Multifamily (5 or more) residential properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	40,505	114,454
One fiscal year before current year	96,888	49,794
Two fiscal years before current year	44,058	46,784
Three fiscal years before current year	44,901	11,854
Four fiscal years before current year	11,167	6,764
More than four fiscal years before current year	29,164	23,841
Revolving Loans Amortized Cost Basis	949	2,629
Revolving Loans Converted to Term	0	0
Total	267,632	256,120
Multifamily (5 or more) residential properties | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	0	510
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	510
Multifamily (5 or more) residential properties | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	305	643
One fiscal year before current year	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	333
More than four fiscal years before current year	495	90
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	800	1,066
Multifamily (5 or more) residential properties | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	193,910	341,378
One fiscal year before current year	299,946	154,901
Two fiscal years before current year	156,893	51,709
Three fiscal years before current year	49,220	70,955
Four fiscal years before current year	58,542	47,023
More than four fiscal years before current year	140,428	118,643
Revolving Loans Amortized Cost Basis	9,581	10,706
Revolving Loans Converted to Term	0	0
Total	908,520	795,315
Current period gross write offs
2023	0
2022	0
2021	0
2020	0
2019	88
Prior	0
Revolving Loans Amortized Cost Basis	248
Revolving Loans Converted to Term	0
Total	336
Non-owner occupied, nonfarm nonresidential properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	193,128	339,151
One fiscal year before current year	298,199	153,613
Two fiscal years before current year	156,405	51,709
Three fiscal years before current year	43,005	66,592
Four fiscal years before current year	55,259	45,211
More than four fiscal years before current year	129,140	107,988
Revolving Loans Amortized Cost Basis	7,427	8,186
Revolving Loans Converted to Term	0	0
Total	882,563	772,450
Non-owner occupied, nonfarm nonresidential properties | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	351	488
Two fiscal years before current year	0	0
Three fiscal years before current year	0	273
Four fiscal years before current year	0	498
More than four fiscal years before current year	700	1,068
Revolving Loans Amortized Cost Basis	436	464
Revolving Loans Converted to Term	0	0
Total	1,487	2,791
Non-owner occupied, nonfarm nonresidential properties | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	782	2,227
One fiscal year before current year	1,396	800
Two fiscal years before current year	488	0
Three fiscal years before current year	6,215	4,090
Four fiscal years before current year	3,283	1,314
More than four fiscal years before current year	10,588	9,587
Revolving Loans Amortized Cost Basis	1,718	2,056
Revolving Loans Converted to Term	0	0
Total	24,470	20,074
Non-owner occupied, nonfarm nonresidential properties | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 0	$ 0