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Loans - Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | $ 11,750 |  | $ 11,750 |  | $ 13,370
Recorded investment with no allowance | 11,368 |  | 11,368 |  | 12,694
Recorded investment with allowance | 383 |  | 383 |  | 682
Total Recorded Investment | 11,751 |  | 11,751 |  | 13,376
Related Allowance | 148 |  | 148 |  | 209
Average recorded investment | 11,800 | $ 15,300 | 13,007 | $ 15,900 | 15,374
Interest recognized | 59 | 121 | 231 | 384 | 399
Accrued interest receivable |  |  | 1 |  | 6
Impaired financing receivable, interest income, cash basis method | 67 | $ 77 | 223 | $ 225 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 0 |  | 0 |  | 464
Recorded investment with no allowance | 0 |  | 0 |  | 466
Recorded investment with allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 466
Related Allowance | 0 |  | 0 |  | 0
Average recorded investment |  |  | 333 |  | 787
Interest recognized |  |  | 0 |  | 37
Commercial and Industrial | Commercial and business loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 0 |  | 0 |  | 250
Recorded investment with no allowance | 0 |  | 0 |  | 251
Recorded investment with allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 251
Related Allowance | 0 |  | 0 |  | 0
Average recorded investment |  |  | 195 |  | 551
Interest recognized |  |  | 0 |  | 23
Commercial and Industrial | Government program loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 0 |  | 0 |  | 214
Recorded investment with no allowance | 0 |  | 0 |  | 215
Recorded investment with allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 215
Related Allowance | 0 |  | 0 |  | 0
Average recorded investment |  |  | 138 |  | 236
Interest recognized |  |  | 0 |  | 14
Real estate mortgage |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 147 |  | 147 |  | 1,239
Recorded investment with no allowance | 0 |  | 0 |  | 878
Recorded investment with allowance | 148 |  | 148 |  | 366
Total Recorded Investment | 148 |  | 148 |  | 1,244
Related Allowance | 4 |  | 4 |  | 13
Average recorded investment |  |  | 1,106 |  | 2,689
Interest recognized |  |  | 5 |  | 71
Real estate mortgage | Commercial real estate |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 0 |  | 0 |  | 874
Recorded investment with no allowance | 0 |  | 0 |  | 878
Recorded investment with allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 878
Related Allowance | 0 |  | 0 |  | 0
Average recorded investment |  |  | 672 |  | 1,822
Interest recognized |  |  | 0 |  | 54
Real estate mortgage | Residential mortgages |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 147 |  | 147 |  | 365
Recorded investment with no allowance | 0 |  | 0 |  | 0
Recorded investment with allowance | 148 |  | 148 |  | 366
Total Recorded Investment | 148 |  | 148 |  | 366
Related Allowance | 4 |  | 4 |  | 13
Average recorded investment |  |  | 434 |  | 867
Interest recognized |  |  | 5 |  | 17
Real estate mortgage | Home improvement and home equity loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 0 |  | 0 |  | 0
Recorded investment with no allowance | 0 |  | 0 |  | 0
Recorded investment with allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 0
Related Allowance | 0 |  | 0 |  | 0
Average recorded investment |  |  | 0 |  | 0
Interest recognized |  |  | 0 |  | 0
Real estate construction and development |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 11,273 |  | 11,273 |  | 11,057
Recorded investment with no allowance | 11,273 |  | 11,273 |  | 11,057
Recorded investment with allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 11,273 |  | 11,273 |  | 11,057
Related Allowance | 0 |  | 0 |  | 0
Average recorded investment |  |  | 11,110 |  | 11,223
Interest recognized |  |  | 209 |  | 252
Agricultural |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 330 |  | 330 |  | 610
Recorded investment with no allowance | 95 |  | 95 |  | 293
Recorded investment with allowance | 235 |  | 235 |  | 316
Total Recorded Investment | 330 |  | 330 |  | 609
Related Allowance | 144 |  | 144 |  | 196
Average recorded investment |  |  | 458 |  | 675
Interest recognized |  |  | 17 |  | 39
Installment and student loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Unpaid Contractual Principal Balance | 0 |  | 0 |  | 0
Recorded investment with no allowance | 0 |  | 0 |  | 0
Recorded investment with allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 0 |  | 0 |  | 0
Related Allowance | $ 0 |  | 0 |  | 0
Average recorded investment |  |  | 0 |  | 0
Interest recognized |  |  | $ 0 |  | $ 0

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