LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Risk Rating (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 4,431,398	$ 4,468,476
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,937,088	2,918,577
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	8,371	95,055
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	101,912	59,027
Farmland
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	100	3,153
One fiscal year before current year	3,178	11,393
Two fiscal years before current year	11,134	7,151
Three fiscal years before current year	6,753	1,465
Four fiscal years before current year	1,459	815
More than four fiscal years before current year	8,130	7,590
Revolving Loans Amortized Cost Basis	391	302
Revolving Loans Converted to Term	0	0
Total	31,145	31,869
Current period gross write offs
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Farmland | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	100	3,153
One fiscal year before current year	3,178	11,393
Two fiscal years before current year	11,134	6,845
Three fiscal years before current year	6,753	1,465
Four fiscal years before current year	1,459	815
More than four fiscal years before current year	7,396	6,813
Revolving Loans Amortized Cost Basis	391	302
Revolving Loans Converted to Term	0	0
Total	30,411	30,786
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	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Farmland | 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	306
Three fiscal years before current year	0	0
Four fiscal years before current year	0	0
More than four fiscal years before current year	734	777
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	734	1,083
Owner-occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	29,574	63,697
One fiscal year before current year	64,683	123,026
Two fiscal years before current year	119,680	105,574
Three fiscal years before current year	103,521	58,201
Four fiscal years before current year	57,295	52,894
More than four fiscal years before current year	119,433	76,452
Revolving Loans Amortized Cost Basis	17,033	13,220
Revolving Loans Converted to Term	0	0
Total	511,219	493,064
Current period gross write offs
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	596	26
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	596	26
Owner-occupied, nonfarm nonresidential properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	29,488	62,529
One fiscal year before current year	63,525	121,722
Two fiscal years before current year	114,581	103,698
Three fiscal years before current year	102,559	44,286
Four fiscal years before current year	43,393	45,749
More than four fiscal years before current year	115,634	73,649
Revolving Loans Amortized Cost Basis	16,355	9,921
Revolving Loans Converted to Term	0	0
Total	485,535	461,554
Owner-occupied, nonfarm nonresidential properties | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	320
One fiscal year before current year	312	1,304
Two fiscal years before current year	243	1,180
Three fiscal years before current year	266	13,623
Four fiscal years before current year	0	407
More than four fiscal years before current year	599	210
Revolving Loans Amortized Cost Basis	516	3,133
Revolving Loans Converted to Term	0	0
Total	1,936	20,177
Owner-occupied, nonfarm nonresidential properties | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	86	848
One fiscal year before current year	846	0
Two fiscal years before current year	4,856	696
Three fiscal years before current year	696	292
Four fiscal years before current year	13,902	6,738
More than four fiscal years before current year	3,200	2,593
Revolving Loans Amortized Cost Basis	162	166
Revolving Loans Converted to Term	0	0
Total	23,748	11,333
Agricultural production and other loans to farmers
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	703
One fiscal year before current year	658	34
Two fiscal years before current year	32	89
Three fiscal years before current year	84	60
Four fiscal years before current year	56	5
More than four fiscal years before current year	162	159
Revolving Loans Amortized Cost Basis	767	602
Revolving Loans Converted to Term	0	0
Total	1,759	1,652
Current period gross write offs
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	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 | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	703
One fiscal year before current year	658	34
Two fiscal years before current year	32	89
Three fiscal years before current year	84	60
Four fiscal years before current year	56	5
More than four fiscal years before current year	162	159
Revolving Loans Amortized Cost Basis	767	602
Revolving Loans Converted to Term	0	0
Total	1,759	1,652
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
Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	26,735	86,043
One fiscal year before current year	67,175	148,366
Two fiscal years before current year	141,262	148,515
Three fiscal years before current year	113,878	33,936
Four fiscal years before current year	30,764	10,277
More than four fiscal years before current year	22,124	16,385
Revolving Loans Amortized Cost Basis	256,853	282,920
Revolving Loans Converted to Term	0	0
Total	658,791	726,442
Current period gross write offs
2024	0	50
2023	0	0
2022	50	0
2021	0	191
2020	0	0
Prior	21	0
Revolving Loans Amortized Cost Basis	0	151
Revolving Loans Converted to Term	0	0
Total	71	392
Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	26,414	78,325
One fiscal year before current year	65,309	140,178
Two fiscal years before current year	140,056	141,439
Three fiscal years before current year	109,566	33,475
Four fiscal years before current year	30,645	6,662
More than four fiscal years before current year	18,931	14,709
Revolving Loans Amortized Cost Basis	222,138	239,193
Revolving Loans Converted to Term	0	0
Total	613,059	653,981
Commercial and Industrial | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	7,718
One fiscal year before current year	41	7,803
Two fiscal years before current year	802	2,795
Three fiscal years before current year	12	65
Four fiscal years before current year	60	139
More than four fiscal years before current year	142	21
Revolving Loans Amortized Cost Basis	2,413	33,489
Revolving Loans Converted to Term	0	0
Total	3,470	52,030
Commercial and Industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	321	0
One fiscal year before current year	1,825	385
Two fiscal years before current year	404	4,281
Three fiscal years before current year	4,300	396
Four fiscal years before current year	59	3,476
More than four fiscal years before current year	3,051	1,655
Revolving Loans Amortized Cost Basis	32,302	10,238
Revolving Loans Converted to Term	0	0
Total	42,262	20,431
Obligations (other than securities and leases) of states and political subdivisions
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	24,964
One fiscal year before current year	25,672	16,791
Two fiscal years before current year	16,565	31,768
Three fiscal years before current year	31,451	12,399
Four fiscal years before current year	11,917	4,190
More than four fiscal years before current year	62,135	58,518
Revolving Loans Amortized Cost Basis	3,399	3,571
Revolving Loans Converted to Term	0	0
Total	151,139	152,201
Current period gross write offs
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	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 | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	24,964
One fiscal year before current year	25,672	16,791
Two fiscal years before current year	16,565	31,768
Three fiscal years before current year	31,451	12,399
Four fiscal years before current year	11,917	4,190
More than four fiscal years before current year	49,094	45,331
Revolving Loans Amortized Cost Basis	3,399	3,571
Revolving Loans Converted to Term	0	0
Total	138,098	139,014
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	0	13,187
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	13,187
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	13,041	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	13,041	0
Other loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	431	3,649
One fiscal year before current year	3,396	12,211
Two fiscal years before current year	12,201	5,289
Three fiscal years before current year	4,950	1,809
Four fiscal years before current year	1,692	288
More than four fiscal years before current year	281	0
Revolving Loans Amortized Cost Basis	2,178	2,261
Revolving Loans Converted to Term	0	0
Total	25,129	25,507
Current period gross write offs
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Other loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	431	3,649
One fiscal year before current year	3,396	12,211
Two fiscal years before current year	12,201	5,289
Three fiscal years before current year	4,950	1,809
Four fiscal years before current year	1,692	288
More than four fiscal years before current year	281	0
Revolving Loans Amortized Cost Basis	2,178	2,261
Revolving Loans Converted to Term	0	0
Total	25,129	25,507
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 construction loans and all land development and other land loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,659	111,843
One fiscal year before current year	131,605	274,838
Two fiscal years before current year	284,697	69,470
Three fiscal years before current year	70,597	19,028
Four fiscal years before current year	10,266	7,635
More than four fiscal years before current year	8,594	1,262
Revolving Loans Amortized Cost Basis	7,312	7,463
Revolving Loans Converted to Term	0	0
Total	532,730	491,539
Current period gross write offs
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	0
Other construction loans and all land development and other land loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	19,659	111,843
One fiscal year before current year	131,605	269,531
Two fiscal years before current year	284,697	69,470
Three fiscal years before current year	70,597	19,028
Four fiscal years before current year	10,266	6,086
More than four fiscal years before current year	7,089	1,262
Revolving Loans Amortized Cost Basis	7,250	7,400
Revolving Loans Converted to Term	0	0
Total	531,163	484,620
Other construction loans and all land development and other land loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
One fiscal year before current year	0	5,307
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	5,307
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	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	0	1,549
More than four fiscal years before current year	1,505	0
Revolving Loans Amortized Cost Basis	62	63
Revolving Loans Converted to Term	0	0
Total	1,567	1,612
Multifamily (5 or more) residential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	573	39,509
One fiscal year before current year	39,437	95,635
Two fiscal years before current year	90,986	63,203
Three fiscal years before current year	62,477	24,527
Four fiscal years before current year	24,333	10,928
More than four fiscal years before current year	29,817	19,786
Revolving Loans Amortized Cost Basis	500	754
Revolving Loans Converted to Term	0	0
Total	248,123	254,342
Current period gross write offs
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020	0	0
Prior	0	65
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term	0	0
Total	0	65
Multifamily (5 or more) residential properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	573	37,366
One fiscal year before current year	37,297	95,635
Two fiscal years before current year	90,986	63,203
Three fiscal years before current year	62,477	24,527
Four fiscal years before current year	21,574	10,928
More than four fiscal years before current year	29,817	19,786
Revolving Loans Amortized Cost Basis	500	754
Revolving Loans Converted to Term	0	0
Total	243,224	252,199
Multifamily (5 or more) residential properties | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	1,346
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	1,346
Multifamily (5 or more) residential properties | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	797
One fiscal year before current year	2,140	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	0
Four fiscal years before current year	2,759	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	4,899	797
Non-owner occupied, nonfarm nonresidential properties
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,141	193,604
One fiscal year before current year	199,037	298,528
Two fiscal years before current year	296,713	151,853
Three fiscal years before current year	149,820	47,383
Four fiscal years before current year	46,287	57,654
More than four fiscal years before current year	178,339	136,704
Revolving Loans Amortized Cost Basis	7,999	10,317
Revolving Loans Converted to Term	0	0
Total	887,336	896,043
Current period gross write offs
2024	0	0
2023	0	358
2022	0	0
2021	0	0
2020	0	88
Prior	0	0
Revolving Loans Amortized Cost Basis	0	248
Revolving Loans Converted to Term	0	0
Total	0	694
Non-owner occupied, nonfarm nonresidential properties | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	9,141	192,826
One fiscal year before current year	198,263	297,394
Two fiscal years before current year	295,587	151,365
Three fiscal years before current year	149,332	39,585
Four fiscal years before current year	38,517	54,388
More than four fiscal years before current year	171,997	125,532
Revolving Loans Amortized Cost Basis	5,873	8,174
Revolving Loans Converted to Term	0	0
Total	868,710	869,264
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	0	0
Two fiscal years before current year	0	0
Three fiscal years before current year	0	1,887
Four fiscal years before current year	1,859	0
More than four fiscal years before current year	676	688
Revolving Loans Amortized Cost Basis	430	433
Revolving Loans Converted to Term	0	0
Total	2,965	3,008
Non-owner occupied, nonfarm nonresidential properties | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	778
One fiscal year before current year	774	1,134
Two fiscal years before current year	1,126	488
Three fiscal years before current year	488	5,911
Four fiscal years before current year	5,911	3,266
More than four fiscal years before current year	5,666	10,484
Revolving Loans Amortized Cost Basis	1,696	1,710
Revolving Loans Converted to Term	0	0
Total	$ 15,661	$ 23,771