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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | $ 5,172 | $ 2,420 |
With a specific allowance recorded, Recorded Investment | 9,360 | 641 |
Related Allowance | 1,657 | 197 |
Recorded Investment | 14,532 | 3,061 |
Average Recorded Investment | 10,234 | 2,649 | $ 1,958
Interest Income Recognized | 269 | 118 | 69
Interest Income Recognized Cash Basis | 135 | 9 | $ 17
Consumer Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 799 | 648 |
With no related allowance recorded, Unpaid Principal Balance | 799 | 648 |
With no related allowance recorded, Average Recorded Investment | 738 | 626 |
With no related allowance recorded, Interest Income Recognized | 22 | 32 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 10 | 9 |
With a specific allowance recorded, Recorded Investment | 202 | 181 |
With a specific allowance recorded, Unpaid Principal Balance | 202 | 184 |
Related Allowance | 31 | 30 |
With a specific allowance recorded, Average Recorded Investment | 126 | 211 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 3 |  |
Recorded Investment | 1,001 | 829 |
Unpaid Principal Balance | 1,001 | 832 |
Average Recorded Investment | 864 | 837 |
Interest Income Recognized | 22 | 32 |
Interest Income Recognized Cash Basis | 13 | 9 |
Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 1,546 |  |
With no related allowance recorded, Unpaid Principal Balance | 1,549 |  |
With no related allowance recorded, Average Recorded Investment | 729 | 204 |
With no related allowance recorded, Interest Income Recognized | 18 |  |
With no related allowance recorded, Interest Income Recognized Cash Basis | 12 |  |
With a specific allowance recorded, Recorded Investment | 5,210 |  |
With a specific allowance recorded, Unpaid Principal Balance | 5,210 |  |
Related Allowance | 600 |  |
With a specific allowance recorded, Average Recorded Investment | 3,175 | 22 |
With a specific allowance recorded, Interest Income Recognized | 6 | 1 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 102 |  |
Recorded Investment | 6,756 |  |
Unpaid Principal Balance | 6,759 |  |
Average Recorded Investment | 3,904 | 226 |
Interest Income Recognized | 24 | 1 |
Interest Income Recognized Cash Basis | 114 |  |
Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 291 | 491 |
With no related allowance recorded, Unpaid Principal Balance | 291 | 491 |
With no related allowance recorded, Average Recorded Investment | 392 | 124 |
With no related allowance recorded, Interest Income Recognized | 3 |  |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  |
With a specific allowance recorded, Recorded Investment | 176 | 200 |
With a specific allowance recorded, Unpaid Principal Balance | 176 | 200 |
Related Allowance | 116 | 21 |
With a specific allowance recorded, Average Recorded Investment | 188 | 29 |
Recorded Investment | 467 | 691 |
Unpaid Principal Balance | 467 | 691 |
Average Recorded Investment | 580 | 153 |
Interest Income Recognized | 3 |  |
Interest Income Recognized Cash Basis | 3 |  |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 185 | 299 |
With no related allowance recorded, Unpaid Principal Balance | 185 | 299 |
With no related allowance recorded, Average Recorded Investment | 195 | 238 |
With no related allowance recorded, Interest Income Recognized | 13 | 19 |
With a specific allowance recorded, Recorded Investment | 2,765 |  |
With a specific allowance recorded, Unpaid Principal Balance | 2,765 |  |
Related Allowance | 20 |  |
With a specific allowance recorded, Average Recorded Investment | 2,524 |  |
With a specific allowance recorded, Interest Income Recognized | 128 |  |
Recorded Investment | 2,950 | 299 |
Unpaid Principal Balance | 2,950 | 299 |
Average Recorded Investment | 2,719 | 238 |
Interest Income Recognized | 141 | 19 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 2,328 | 982 |
With no related allowance recorded, Unpaid Principal Balance | 2,328 | 982 |
With no related allowance recorded, Average Recorded Investment | 1,222 | 637 |
With no related allowance recorded, Interest Income Recognized | 26 | 66 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 5 |  |
With a specific allowance recorded, Recorded Investment | 1,007 | 227 |
With a specific allowance recorded, Unpaid Principal Balance | 1,007 | 377 |
Related Allowance | 890 | 142 |
With a specific allowance recorded, Average Recorded Investment | 916 | 555 |
With a specific allowance recorded, Interest Income Recognized | 52 |  |
Recorded Investment | 3,335 | 1,209 |
Unpaid Principal Balance | 3,335 | 1,359 |
Average Recorded Investment | 2,138 | 1,192 |
Interest Income Recognized | 78 | 66 |
Interest Income Recognized Cash Basis | 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 | 16 |  |
With a specific allowance recorded, Recorded Investment |  | 33 |
With a specific allowance recorded, Unpaid Principal Balance |  | 33 |
Related Allowance |  | 4 |
With a specific allowance recorded, Average Recorded Investment | 11 | 3 |
With a specific allowance recorded, Interest Income Recognized | 1 |  |
Recorded Investment | 23 | 33 |
Unpaid Principal Balance | 23 | 33 |
Average Recorded Investment | 27 | $ 3 |
Interest Income Recognized | $ 1 |  |

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