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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans by Year of Origination, Loan Segmentation and Risk Indicator (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Credit quality information    
2023 $ 50,588 $ 300,691
2022 302,663 804,770
2021 802,970 497,365
2020 491,926 333,145
2019 325,158 197,739
Prior 1,038,367 865,339
Total loans 3,011,672 2,999,049
Construction and land development | Total commercial loans    
Credit quality information    
2023 1,219 14,040
2022 23,199 99,115
2021 107,106 35,978
2020 20,918 3,992
2019 4,415  
Prior 1,413 923
Total loans 158,270 154,048
Construction and land development | Pass | Total commercial loans    
Credit quality information    
2023 1,219 14,040
2022 23,199 99,115
2021 107,106 35,978
2020 20,918 3,992
2019 4,415  
Prior 1,413 923
Total loans 158,270 154,048
Commercial real estate owner occupied | Total commercial real estate    
Credit quality information    
2023 1,328 57,763
2022 52,643 61,402
2021 67,078 50,716
2020 60,467 21,805
2019 21,540 20,462
Prior 120,525 97,867
Total loans 323,581 310,015
Current period gross write-offs    
Prior 3  
Total 3  
Commercial real estate owner occupied | Pass | Total commercial real estate    
Credit quality information    
2023 1,328 57,603
2022 52,491 61,015
2021 67,078 43,228
2020 60,467 20,209
2019 19,975 20,462
Prior 115,429 91,187
Total loans 316,768 293,704
Commercial real estate owner occupied | Special mention | Total commercial real estate    
Credit quality information    
2023   160
2022 152 387
2021   7,488
2020   1,596
2019 1,565  
Prior 3,382 3,066
Total loans 5,099 12,697
Commercial real estate owner occupied | Substandard | Total commercial real estate    
Credit quality information    
Prior 1,604 3,497
Total loans 1,604 3,497
Commercial real estate owner occupied | Doubtful | Total commercial real estate    
Credit quality information    
Prior 110 117
Total loans 110 117
Commercial real estate non-owner occupied | Total commercial real estate    
Credit quality information    
2023 10,379 49,079
2022 48,987 353,613
2021 352,160 213,445
2020 220,143 164,480
2019 163,754 94,005
Prior 359,874 269,944
Total loans 1,155,297 1,144,566
Commercial real estate non-owner occupied | Pass | Total commercial real estate    
Credit quality information    
2023 10,379 41,270
2022 41,205 353,613
2021 342,797 199,311
2020 198,618 127,231
2019 135,808 78,759
Prior 321,447 238,973
Total loans 1,050,254 1,039,157
Commercial real estate non-owner occupied | Special mention | Total commercial real estate    
Credit quality information    
2023   7,809
2022 7,782  
2021 9,363 14,134
2020 21,525 37,249
2019 27,946 15,246
Prior 20,597 17,108
Total loans 87,213 91,546
Commercial real estate non-owner occupied | Substandard | Total commercial real estate    
Credit quality information    
Prior 17,830 13,863
Total loans 17,830 13,863
Tax exempt    
Credit quality information    
2023 501 6,340
2022 2,832 8,468
2021 8,468 787
2020 724 208
2019 208 590
Prior 26,528 27,295
Total loans 39,261 43,688
Tax exempt | Pass    
Credit quality information    
2023 501 6,340
2022 2,832 8,468
2021 8,468 787
2020 724 208
2019 208 590
Prior 26,528 27,295
Total loans 39,261 43,688
Commercial and industrial | Total commercial and industrial    
Credit quality information    
2023 25,552 81,364
2022 79,873 70,942
2021 64,140 22,391
2020 18,422 39,709
2019 34,542 14,949
Prior 84,315 81,528
Total loans 306,844 310,883
Current period gross write-offs    
2020 62  
2019 3 5
Prior   659
Total 65 664
Commercial and industrial | Pass    
Credit quality information    
2023   80,942
2022   69,402
2021   22,205
2020   38,824
2019   14,739
Prior   77,273
Total loans   303,385
Commercial and industrial | Pass | Total commercial and industrial    
Credit quality information    
2023 25,552  
2022 79,412  
2021 62,520  
2020 18,175  
2019 33,714  
Prior 79,651  
Total loans 299,024  
Commercial and industrial | Special mention | Total commercial and industrial    
Credit quality information    
2023   364
2022 306 1,446
2021 1,419  
2020 124 776
2019 704 28
Prior 3,442 3,588
Total loans 5,995 6,202
Commercial and industrial | Substandard | Total commercial and industrial    
Credit quality information    
2023   58
2022 155 94
2021 201 186
2020 123 109
2019 124 95
Prior 1,001 532
Total loans 1,604 1,074
Commercial and industrial | Doubtful | Total commercial and industrial    
Credit quality information    
2019   87
Prior 221 135
Total loans 221 222
Residential mortgages | Residential real estate    
Credit quality information    
2023 7,076 72,395
2022 76,695 194,109
2021 187,342 165,475
2020 163,510 96,016
2019 94,344 62,882
Prior 404,944 349,457
Total loans 933,911 940,334
Current period gross write-offs    
Prior   8
Total   8
Residential mortgages | Performing | Residential real estate    
Credit quality information    
2023 7,076 72,395
2022 76,695 194,109
2021 186,939 165,434
2020 162,848 96,016
2019 94,344 62,648
Prior 401,684 345,823
Total loans 929,586 936,425
Residential mortgages | Nonperforming | Residential real estate    
Credit quality information    
2021 403 41
2020 662  
2019   234
Prior 3,260 3,634
Total loans 4,325 3,909
Home equity    
Credit quality information    
2023 2,620 15,582
2022 15,816 15,334
2021 15,200 7,873
2020 7,164 6,633
2019 6,138 4,800
Prior 39,941 37,461
Total loans 86,879 87,683
Current period gross write-offs    
Prior   12
Total   12
Home equity | Performing    
Credit quality information    
2023 2,620 15,582
2022 15,816 15,334
2021 15,200 7,873
2020 7,107 6,633
2019 6,138 4,800
Prior 39,038 36,652
Total loans 85,919 86,874
Home equity | Nonperforming    
Credit quality information    
2020 57  
Prior 903 809
Total loans 960 809
Other consumer    
Credit quality information    
2023   4,128
2022   1,787
2021   700
2020   302
2019   51
Prior   864
Total loans   7,832
Other consumer | Consumer    
Credit quality information    
2023 1,913  
2022 2,618  
2021 1,476  
2020 578  
2019 217  
Prior 827  
Total loans 7,629  
Current period gross write-offs    
2022 4 52
2021 1 18
2020   5
Prior 40 214
Total 45 289
Other consumer | Performing | Consumer    
Credit quality information    
2023 1,913 4,128
2022 2,618 1,787
2021 1,476 696
2020 572 301
2019 212 51
Prior 827 864
Total loans 7,618 7,827
Other consumer | Nonperforming | Consumer    
Credit quality information    
2021   4
2020 6 1
2019 5  
Total loans $ 11 $ 5