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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2021
Recorded Investment |  |
Total | $ 9,605 |
Unpaid Principal Balance |  |
Total | 10,228 |
Related Allowance |  |
With an allowance recorded | 1,513 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average Recorded Investment | 8,067 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest Income Recognized | 78 |
Specific reserve for loans individually evaluated, threshold |  | $ 150
Commercial construction |  |
Recorded Investment |  |
With an allowance recorded | 258 |
Unpaid Principal Balance |  |
With an allowance recorded | 258 |
Related Allowance |  |
With an allowance recorded | 205 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average recorded investment, with related allowance | 203 |
Other commercial real estate |  |
Recorded Investment |  |
With no related allowance | 2,001 |
With an allowance recorded | 1,963 |
Unpaid Principal Balance |  |
With no related allowance | 2,047 |
With an allowance recorded | 2,108 |
Related Allowance |  |
With an allowance recorded | 1,038 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average recorded investment, with no related allowance | 1,610 |
Average recorded investment, with related allowance | 1,973 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest income recognized, with related allowance | 17 |
Commercial |  |
Recorded Investment |  |
With no related allowance | 1,095 |
With an allowance recorded | 282 |
Unpaid Principal Balance |  |
With no related allowance | 1,254 |
With an allowance recorded | 289 |
Related Allowance |  |
With an allowance recorded | 164 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average recorded investment, with no related allowance | 1,140 |
Average recorded investment, with related allowance | 73 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest income recognized, with no related allowance | 4 |
Agricultural |  |
Recorded Investment |  |
With no related allowance | 361 |
Unpaid Principal Balance |  |
With no related allowance | 150 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average recorded investment, with no related allowance | 114 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest income recognized, with no related allowance | 2 |
Residential mortgages |  |
Recorded Investment |  |
With no related allowance | 2,745 |
With an allowance recorded | 887 |
Unpaid Principal Balance |  |
With no related allowance | 3,165 |
With an allowance recorded | 944 |
Related Allowance |  |
With an allowance recorded | 106 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average recorded investment, with no related allowance | 1,077 |
Average recorded investment, with related allowance | 1,865 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest income recognized, with no related allowance | 17 |
Interest income recognized, with related allowance | 37 |
Home equity |  |
Recorded Investment |  |
With an allowance recorded | 13 |
Unpaid Principal Balance |  |
With an allowance recorded | 13 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average recorded investment, with related allowance | 12 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest income recognized, with related allowance | 1 |
Total commercial real estate |  |
Recorded Investment |  |
Total | 4,222 |
Unpaid Principal Balance |  |
Total | 4,413 |
Related Allowance |  |
With an allowance recorded | 1,243 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average Recorded Investment | 3,786 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest Income Recognized | 17 |
Total commercial and industrial |  |
Recorded Investment |  |
Total | 1,738 |
Unpaid Principal Balance |  |
Total | 1,693 |
Related Allowance |  |
With an allowance recorded | 164 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average Recorded Investment | 1,327 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest Income Recognized | 6 |
Total residential real estate |  |
Recorded Investment |  |
Total | 3,632 |
Unpaid Principal Balance |  |
Total | 4,109 |
Related Allowance |  |
With an allowance recorded | 106 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average Recorded Investment | 2,942 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest Income Recognized | 54 |
Total consumer |  |
Recorded Investment |  |
Total | 13 |
Unpaid Principal Balance |  |
Total | 13 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |
Average Recorded Investment | 12 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |
Interest Income Recognized | $ 1 |

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