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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | $ 1,228 | $ 5,172 |
With a specific allowance recorded, Recorded Investment | 10,711 | 9,360 |
Related Allowance | 2,184 | 1,657 |
Recorded Investment | 11,939 | 14,532 |
Average Recorded Investment | 12,247 | 10,232 | $ 2,649
Interest Income Recognized | 292 | 269 | 118
Interest Income Recognized Cash Basis | 188 | 135 | $ 9
Consumer Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 604 | 799 |
With no related allowance recorded, Unpaid Principal Balance | 604 | 799 |
With no related allowance recorded, Average Recorded Investment | 456 | 738 |
With no related allowance recorded, Interest Income Recognized | 5 | 22 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 15 | 10 |
With a specific allowance recorded, Recorded Investment |  | 202 |
With a specific allowance recorded, Unpaid Principal Balance |  | 202 |
Related Allowance |  | 31 |
With a specific allowance recorded, Average Recorded Investment | 59 | 126 |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  | 3 |
Recorded Investment | 604 | 1,001 |
Unpaid Principal Balance | 604 | 1,001 |
Average Recorded Investment | 515 | 864 |
Interest Income Recognized | 5 | 22 |
Interest Income Recognized Cash Basis | 15 | 13 |
Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 423 | 1,546 |
With no related allowance recorded, Unpaid Principal Balance | 423 | 1,549 |
With no related allowance recorded, Average Recorded Investment | 1,000 | 729 |
With no related allowance recorded, Interest Income Recognized | 33 | 18 |
With no related allowance recorded, Interest Income Recognized Cash Basis |  | 12 |
With a specific allowance recorded, Recorded Investment | 6,302 | 5,210 |
With a specific allowance recorded, Unpaid Principal Balance | 6,406 | 5,210 |
Related Allowance | 691 | 600 |
With a specific allowance recorded, Average Recorded Investment | 5,414 | 3,175 |
With a specific allowance recorded, Interest Income Recognized | 54 | 6 |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  | 102 |
Recorded Investment | 6,725 | 6,756 |
Unpaid Principal Balance | 6,829 | 6,759 |
Average Recorded Investment | 6,414 | 3,904 |
Interest Income Recognized | 87 | 24 |
Interest Income Recognized Cash Basis |  | 114 |
Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment |  | 291 |
With no related allowance recorded, Unpaid Principal Balance |  | 291 |
With no related allowance recorded, Average Recorded Investment | 143 | 392 |
With no related allowance recorded, Interest Income Recognized | 18 | 3 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 | 3 |
With a specific allowance recorded, Recorded Investment | 20 | 176 |
With a specific allowance recorded, Unpaid Principal Balance | 20 | 176 |
Related Allowance | 1 | 116 |
With a specific allowance recorded, Average Recorded Investment | 94 | 188 |
Recorded Investment | 20 | 467 |
Unpaid Principal Balance | 20 | 467 |
Average Recorded Investment | 237 | 580 |
Interest Income Recognized | 18 | 3 |
Interest Income Recognized Cash Basis | 3 | 3 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 180 | 185 |
With no related allowance recorded, Unpaid Principal Balance | 180 | 185 |
With no related allowance recorded, Average Recorded Investment | 1,445 | 195 |
With no related allowance recorded, Interest Income Recognized | 70 | 13 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 9 |  |
With a specific allowance recorded, Recorded Investment | 3,381 | 2,765 |
With a specific allowance recorded, Unpaid Principal Balance | 3,381 | 2,765 |
Related Allowance | 664 | 20 |
With a specific allowance recorded, Average Recorded Investment | 2,199 | 2,524 |
With a specific allowance recorded, Interest Income Recognized | 70 | 128 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 3 |  |
Recorded Investment | 3,561 | 2,950 |
Unpaid Principal Balance | 3,561 | 2,950 |
Average Recorded Investment | 3,644 | 2,719 |
Interest Income Recognized | 140 | 141 |
Interest Income Recognized Cash Basis | 12 |  |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 21 | 2,328 |
With no related allowance recorded, Unpaid Principal Balance | 21 | 2,328 |
With no related allowance recorded, Average Recorded Investment | 920 | 1,222 |
With no related allowance recorded, Interest Income Recognized | 24 | 26 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 158 | 5 |
With a specific allowance recorded, Recorded Investment | 982 | 1,007 |
With a specific allowance recorded, Unpaid Principal Balance | 982 | 1,007 |
Related Allowance | 825 | 890 |
With a specific allowance recorded, Average Recorded Investment | 498 | 916 |
With a specific allowance recorded, Interest Income Recognized | 17 | 52 |
Recorded Investment | 1,003 | 3,335 |
Unpaid Principal Balance | 1,003 | 3,335 |
Average Recorded Investment | 1,418 | 2,138 |
Interest Income Recognized | 41 | 78 |
Interest Income Recognized Cash Basis | 158 | 5 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment |  | 23 |
With no related allowance recorded, Unpaid Principal Balance |  | 23 |
With no related allowance recorded, Average Recorded Investment | 17 | 16 |
With a specific allowance recorded, Recorded Investment | 26 |  |
With a specific allowance recorded, Unpaid Principal Balance | 26 |  |
Related Allowance | 3 |  |
With a specific allowance recorded, Average Recorded Investment | 2 | 11 |
With a specific allowance recorded, Interest Income Recognized | 1 | 1 |
Recorded Investment | 26 | 23 |
Unpaid Principal Balance | 26 | 23 |
Average Recorded Investment | 19 | 27 |
Interest Income Recognized | $ 1 | $ 1 |

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