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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Summary of Credit Exposure in Company Loan Portfolio (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | $ 666,114 | $ 628,756
Credit Exposure 2020 | 332,087 | 286,256
Credit Exposure 2019 | 199,318 | 212,899
Credit Exposure 2018 | 164,064 | 163,831
Credit Exposure 2017 | 121,118 | 174,558
Credit Exposure Prior | 347,892 | 274,903
Revolving Loans Amortized Cost | 140,288 | 125,616
Total | 1,970,881 | 1,866,819
Credit Exposure 2021.Charge - offs | (180) | (243)
Credit Exposure 2020.Charge - offs | (34) | (63)
Credit Exposure 2019.Charge - offs | (222) | (92)
Credit Exposure 2018.Charge - offs | (155) |
Credit Exposure 2017.Charge - offs | (493) | (12)
Credit Exposure Prior.Charge - offs | (271) | (65)
Credit Exposure Revolving Loans Amortized Cost.Charge - offs | (47) | (25)
Total | (1,402) | (543)
Credit Exposure 2021, Recoveries | 45 | 49
Credit Exposure 2020, Recoveries | 3 | 2
Credit Exposure 2019, Recoveries |  | 55
Credit Exposure 2018, Recoveries | 8 | 8
Credit Exposure 2017, Recoveries | 13 | 24
Credit Exposure Prior, Recoveries | 20 | 30
Credit Exposure Revolving Loans Amortized Cost, Recoveries | 15 | 44
Total | 104 | 212
Credit Exposure 2021,Current period net | (135) | (194)
Credit Exposure 2020,Current period net | (31) | (61)
Credit Exposure 2019,Current period net | (222) | (37)
Credit Exposure 2018,Current period net | (147) | (35)
Credit Exposure 2017,Current period net | (480) | 12
Credit Exposure Prior,Current period net | (251) | (35)
Credit Exposure Revolving Loans Amortized Cost,Current period net | 32 | 19
Total | (1,298) | (331)
Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 665,708 | 628,236
Credit Exposure 2020 | 323,857 | 281,239
Credit Exposure 2019 | 198,199 | 205,907
Credit Exposure 2018 | 150,711 | 148,724
Credit Exposure 2017 | 101,365 | 157,326
Credit Exposure Prior | 330,611 | 264,245
Revolving Loans Amortized Cost | 140,260 | 125,616
Total | 1,910,711 | 1,811,293
Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 398 | 496
Credit Exposure 2020 | 807 | 2,918
Credit Exposure 2019 | 9 | 3,773
Credit Exposure 2018 | 2,439 | 5,922
Credit Exposure 2017 | 5,587 | 7,048
Credit Exposure Prior | 1,714 | 652
Total | 10,954 | 20,809
Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 | 7,318 | 923
Credit Exposure 2019 | 674 | 2,565
Credit Exposure 2018 | 10,354 | 4,963
Credit Exposure 2017 | 13,867 | 5,192
Credit Exposure Prior | 13,868 | 8,369
Total | 46,081 | 22,012
Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 8 | 24
Credit Exposure 2020 | 105 | 1,176
Credit Exposure 2019 | 436 | 654
Credit Exposure 2018 | 560 | 4,222
Credit Exposure 2017 | 299 | 4,992
Credit Exposure Prior | 1,699 | 1,637
Revolving Loans Amortized Cost | 28 |
Total | 3,135 | 12,705
Commercial and industrial |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 199,537 | 278,811
Credit Exposure 2020 | 41,275 | 30,989
Credit Exposure 2019 | 21,042 | 13,635
Credit Exposure 2018 | 9,816 | 8,456
Credit Exposure 2017 | 4,397 | 7,512
Credit Exposure Prior | 17,635 | 16,294
Revolving Loans Amortized Cost | 86,768 | 90,074
Total | 380,470 | 445,771
Credit Exposure 2019.Charge - offs | (167) | (43)
Credit Exposure 2018.Charge - offs | (67) |
Credit Exposure 2017.Charge - offs | (19) |
Credit Exposure Revolving Loans Amortized Cost.Charge - offs | (47) | (25)
Total | (300) | (68)
Credit Exposure 2019, Recoveries |  | 43
Credit Exposure Prior, Recoveries | 0 | 14
Credit Exposure Revolving Loans Amortized Cost, Recoveries | 15 | 44
Total | 15 | 101
Credit Exposure 2019,Current period net | (167) |
Credit Exposure 2018,Current period net | (67) |
Credit Exposure 2017,Current period net | (19) |
Credit Exposure Prior,Current period net | 0 | 14
Credit Exposure Revolving Loans Amortized Cost,Current period net | 32 | 19
Total | (285) | 33
Commercial and industrial | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 199,537 | 278,687
Credit Exposure 2020 | 40,901 | 30,563
Credit Exposure 2019 | 20,982 | 12,860
Credit Exposure 2018 | 9,595 | 4,366
Credit Exposure 2017 | 4,333 | 6,131
Credit Exposure Prior | 17,616 | 16,294
Revolving Loans Amortized Cost | 86,768 | 90,074
Total | 379,732 | 438,975
Commercial and industrial | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 0 | 124
Credit Exposure 2020 | 96 | 119
Credit Exposure 2019 |  | 222
Credit Exposure 2018 |  | 4,040
Credit Exposure 2017 | 21 | 1,324
Total | 117 | 5,829
Commercial and industrial | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 | 278 | 307
Credit Exposure 2019 | 60 | 540
Credit Exposure 2018 | 196 | 50
Credit Exposure 2017 | 43 | 43
Credit Exposure Prior | 5 |
Total | 582 | 940
Commercial and industrial | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2019 | 0 | 13
Credit Exposure 2018 | 25 |
Credit Exposure 2017 |  | 14
Credit Exposure Prior | 14 |
Revolving Loans Amortized Cost | 0 |
Total | 39 | 27
Construction and development |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 153,740 | 118,946
Credit Exposure 2020 | 78,831 | 77,535
Credit Exposure 2019 | 30,003 | 26,217
Credit Exposure 2018 | 7,152 | 25,514
Credit Exposure 2017 | 17,360 | 8,422
Credit Exposure Prior | 14,347 | 10,507
Revolving Loans Amortized Cost | 8,313 | 3,266
Total | 309,746 | 270,407
Credit Exposure Prior, Recoveries | 1 |
Total | 1 |
Credit Exposure Prior,Current period net | 1 |
Total | 1 |
Construction and development | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 153,740 | 118,590
Credit Exposure 2020 | 78,121 | 76,926
Credit Exposure 2019 | 29,164 | 26,212
Credit Exposure 2018 | 7,149 | 24,524
Credit Exposure 2017 | 16,405 | 7,742
Credit Exposure Prior | 14,347 | 10,507
Revolving Loans Amortized Cost | 8,313 | 3,266
Total | 307,239 | 267,767
Construction and development | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 |  | 356
Credit Exposure 2020 | 710 |
Credit Exposure 2018 |  | 990
Credit Exposure 2017 | 955 |
Total | 1,665 | 1,346
Construction and development | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 |  | 609
Credit Exposure 2019 | 609 | 5
Credit Exposure 2018 | 3 |
Credit Exposure 2017 |  | 680
Total | 612 | 1,294
Construction and development | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2019 | 230 |
Total | 230 |
Commercial real estate |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 101,251 | 91,819
Credit Exposure 2020 | 105,765 | 84,609
Credit Exposure 2019 | 80,197 | 95,245
Credit Exposure 2018 | 77,555 | 82,231
Credit Exposure 2017 | 62,299 | 101,884
Credit Exposure Prior | 191,587 | 132,538
Revolving Loans Amortized Cost | 14,699 | 5,890
Total | 633,353 | 594,216
Credit Exposure Prior, Recoveries |  | 1
Total |  | 1
Credit Exposure Prior,Current period net |  | 1
Total |  | 1
Commercial real estate | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 100,853 | 91,819
Credit Exposure 2020 | 98,665 | 80,753
Credit Exposure 2019 | 80,197 | 89,542
Credit Exposure 2018 | 64,919 | 72,311
Credit Exposure 2017 | 44,565 | 86,946
Credit Exposure Prior | 176,005 | 123,463
Revolving Loans Amortized Cost | 14,699 | 5,890
Total | 579,903 | 550,724
Commercial real estate | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 398 |
Credit Exposure 2020 |  | 2,716
Credit Exposure 2019 | 0 | 3,542
Credit Exposure 2018 | 2,439 | 849
Credit Exposure 2017 | 4,591 | 5,724
Credit Exposure Prior | 1,629 | 449
Total | 9,057 | 13,280
Commercial real estate | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 | 7,040 |
Credit Exposure 2019 | 0 | 2,010
Credit Exposure 2018 | 10,124 | 4,913
Credit Exposure 2017 | 13,110 | 4,445
Credit Exposure Prior | 13,732 | 8,240
Total | 44,006 | 19,608
Commercial real estate | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 | 60 | 1,140
Credit Exposure 2019 |  | 151
Credit Exposure 2018 | 73 | 4,158
Credit Exposure 2017 | 33 | 4,769
Credit Exposure Prior | 221 | 386
Total | 387 | 10,604
Farmland |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 72,382 | 17,444
Credit Exposure 2020 | 12,776 | 12,668
Credit Exposure 2019 | 8,683 | 10,327
Credit Exposure 2018 | 8,541 | 6,620
Credit Exposure 2017 | 5,345 | 9,904
Credit Exposure Prior | 21,881 | 15,681
Revolving Loans Amortized Cost | 5,805 | 5,864
Total | 135,413 | 78,508
Credit Exposure 2019.Charge - offs | (17) |
Credit Exposure 2018.Charge - offs | 56 |
Credit Exposure 2017.Charge - offs | (472) |
Credit Exposure Prior.Charge - offs | (271) |
Total | (816) |
Credit Exposure 2017, Recoveries | 11 |
Total | 11 |
Credit Exposure 2019,Current period net | (17) |
Credit Exposure 2018,Current period net | (56) |
Credit Exposure 2017,Current period net | (461) |
Credit Exposure Prior,Current period net | (271) |
Total | (805) |
Farmland | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 72,382 | 17,444
Credit Exposure 2020 | 12,776 | 12,668
Credit Exposure 2019 | 8,683 | 10,327
Credit Exposure 2018 | 8,541 | 6,620
Credit Exposure 2017 | 5,345 | 9,904
Credit Exposure Prior | 21,626 | 15,402
Revolving Loans Amortized Cost | 5,777 | 5,864
Total | 135,130 | 78,229
Farmland | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure Prior | 28 | 35
Total | 28 | 35
Farmland | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure Prior | 118 | 129
Total | 118 | 129
Farmland | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure Prior | 109 | 115
Revolving Loans Amortized Cost | 28 |
Total | 137 | 115
1-4 family residential |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 101,523 | 87,578
Credit Exposure 2020 | 72,986 | 62,937
Credit Exposure 2019 | 48,259 | 52,413
Credit Exposure 2018 | 38,960 | 37,268
Credit Exposure 2017 | 29,331 | 44,021
Credit Exposure Prior | 98,976 | 94,788
Revolving Loans Amortized Cost | 13,368 | 10,091
Total | 403,403 | 389,096
Credit Exposure 2017.Charge - offs |  | (9)
Credit Exposure Prior.Charge - offs |  | (59)
Total |  | (68)
Credit Exposure Prior, Recoveries |  | 2
Total |  | 2
Credit Exposure 2017,Current period net |  | (9)
Credit Exposure Prior,Current period net |  | (57)
Total |  | (66)
1-4 family residential | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 101,523 | 87,578
Credit Exposure 2020 | 72,986 | 62,937
Credit Exposure 2019 | 48,075 | 52,087
Credit Exposure 2018 | 38,577 | 37,224
Credit Exposure 2017 | 29,077 | 43,858
Credit Exposure Prior | 97,575 | 93,486
Revolving Loans Amortized Cost | 13,368 | 10,091
Total | 401,181 | 387,261
1-4 family residential | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2017 | 0 |
Credit Exposure Prior | 57 | 168
Total | 57 | 168
1-4 family residential | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2019 | 184 | 326
Credit Exposure 2018 | 383 | 44
Credit Exposure 2017 | 254 | 163
Credit Exposure Prior | 1,344 | 1,134
Total | 2,165 | 1,667
Multi-family residential |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 13,113 | 5,889
Credit Exposure 2020 | 4,312 | 4,498
Credit Exposure 2019 | 4,392 | 3,617
Credit Exposure 2018 | 15,448 | 1,371
Credit Exposure 2017 | 1,220 | 1,737
Credit Exposure Prior | 2,194 | 4,391
Revolving Loans Amortized Cost | 131 | 198
Total | 40,810 | 21,701
Multi-family residential | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 13,113 | 5,889
Credit Exposure 2020 | 4,312 | 4,498
Credit Exposure 2019 | 4,392 | 3,617
Credit Exposure 2018 | 15,448 | 1,371
Credit Exposure 2017 | 545 | 1,737
Credit Exposure Prior | 2,194 | 4,391
Revolving Loans Amortized Cost | 131 | 198
Total | 40,135 | 21,701
Multi-family residential | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2017 | 675 |
Total | 675 |
Consumer and Overdrafts |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 21,957 | 24,780
Credit Exposure 2020 | 14,041 | 11,295
Credit Exposure 2019 | 5,685 | 9,509
Credit Exposure 2018 | 5,470 | 1,728
Credit Exposure 2017 | 829 | 736
Credit Exposure Prior | 667 | 513
Revolving Loans Amortized Cost | 4,838 | 2,825
Total | 53,487 | 51,386
Credit Exposure 2021.Charge - offs | (180) | (243)
Credit Exposure 2020.Charge - offs | (34) | (63)
Credit Exposure 2019.Charge - offs | (38) | (31)
Credit Exposure 2018.Charge - offs | (32) | (43)
Credit Exposure 2017.Charge - offs | (2) | (3)
Credit Exposure Prior.Charge - offs |  | (6)
Total | (286) | (389)
Credit Exposure 2021, Recoveries | 45 | 49
Credit Exposure 2020, Recoveries | 3 | 2
Credit Exposure 2019, Recoveries |  | 12
Credit Exposure 2018, Recoveries | 8 | 8
Credit Exposure 2017, Recoveries | 2 | 4
Credit Exposure Prior, Recoveries | 19 | 13
Total | 77 | 88
Credit Exposure 2021,Current period net | (135) | (194)
Credit Exposure 2020,Current period net | (31) | (61)
Credit Exposure 2019,Current period net | (38) | (19)
Credit Exposure 2018,Current period net | (24) | (35)
Credit Exposure 2017,Current period net | 0 | 1
Credit Exposure Prior,Current period net | 19 | 7
Total | (209) | (301)
Consumer and Overdrafts | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 21,949 | 24,740
Credit Exposure 2020 | 14,015 | 11,176
Credit Exposure 2019 | 5,654 | 9,369
Credit Exposure 2018 | 5,400 | 1,701
Credit Exposure 2017 | 820 | 735
Credit Exposure Prior | 656 | 513
Revolving Loans Amortized Cost | 4,838 | 2,825
Total | 53,332 | 51,059
Consumer and Overdrafts | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 |  | 16
Credit Exposure 2020 | 1 | 83
Credit Exposure 2019 | 9 | 9
Credit Exposure 2018 |  | 7
Total | 10 | 115
Consumer and Overdrafts | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 8 | 24
Credit Exposure 2020 | 25 | 36
Credit Exposure 2019 | 22 | 131
Credit Exposure 2018 | 70 | 20
Credit Exposure 2017 | 9 | 1
Credit Exposure Prior | 11 |
Total | 145 | 212
Agricultural |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 2,611 | 3,489
Credit Exposure 2020 | 2,101 | 1,725
Credit Exposure 2019 | 1,057 | 1,936
Credit Exposure 2018 | 1,122 | 643
Credit Exposure 2017 | 337 | 342
Credit Exposure Prior | 605 | 191
Revolving Loans Amortized Cost | 6,366 | 7,408
Total | 14,199 | 15,734
Credit Exposure 2019.Charge - offs |  | (18)
Total |  | (18)
Credit Exposure 2017, Recoveries |  | 20
Total |  | 20
Credit Exposure 2019,Current period net |  | (18)
Credit Exposure 2017,Current period net |  | 20
Total |  | 2
Agricultural | Pass |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2021 | 2,611 | 3,489
Credit Exposure 2020 | 2,081 | 1,718
Credit Exposure 2019 | 1,052 | 1,893
Credit Exposure 2018 | 1,082 | 607
Credit Exposure 2017 | 275 | 273
Credit Exposure Prior | 592 | 189
Revolving Loans Amortized Cost | 6,366 | 7,408
Total | 14,059 | 15,577
Agricultural | Special Mention |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2018 |  | 36
Credit Exposure 2017 | 20 |
Total | 20 | 36
Agricultural | Substandard |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 |  | 7
Credit Exposure 2019 | 5 | 10
Credit Exposure 2018 | 31 |
Credit Exposure 2017 | 39 | 24
Credit Exposure Prior | 13 |
Total | 88 | 41
Agricultural | Nonaccrual |  |
Financing Receivable Recorded Investment [Line Items] |  |
Credit Exposure 2020 | 20 |
Credit Exposure 2019 |  | 33
Credit Exposure 2018 | 9 |
Credit Exposure 2017 | 3 | 45
Credit Exposure Prior |  | 2
Total | $ 32 | $ 80

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