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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | $ 2,420 | $ 1,808 |
With a specific allowance recorded, Recorded Investment | 641 | 246 |
Related Allowance | 197 | 31 |
Recorded Investment | 3,061 | 2,054 |
Average Recorded Investment | 2,649 | 1,958 | $ 1,885
Interest Income Recognized | 118 | 69 | 57
Interest Income Recognized Cash Basis | 9 | 17 | $ 23
Consumer Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 648 | 583 |
With no related allowance recorded, Unpaid Principal Balance | 648 | 583 |
With no related allowance recorded, Average Recorded Investment | 626 | 562 |
With no related allowance recorded, Interest Income Recognized | 32 | 31 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 9 | 17 |
With a specific allowance recorded, Recorded Investment | 181 | 174 |
With a specific allowance recorded, Unpaid Principal Balance | 184 | 174 |
Related Allowance | 30 | 26 |
With a specific allowance recorded, Average Recorded Investment | 211 | 158 |
Recorded Investment | 829 | 757 |
Unpaid Principal Balance | 832 | 757 |
Average Recorded Investment | 837 | 720 |
Interest Income Recognized | 32 | 31 |
Interest Income Recognized Cash Basis | 9 | 17 |
Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Average Recorded Investment | 204 | 17 |
With a specific allowance recorded, Average Recorded Investment | 22 |  |
With a specific allowance recorded, Interest Income Recognized | 1 |  |
Average Recorded Investment | 226 | 17 |
Interest Income Recognized | 1 |  |
Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 491 |  |
With no related allowance recorded, Unpaid Principal Balance | 491 |  |
With no related allowance recorded, Average Recorded Investment | 124 |  |
With a specific allowance recorded, Recorded Investment | 200 |  |
With a specific allowance recorded, Unpaid Principal Balance | 200 |  |
Related Allowance | 21 |  |
With a specific allowance recorded, Average Recorded Investment | 29 |  |
Recorded Investment | 691 |  |
Unpaid Principal Balance | 691 |  |
Average Recorded Investment | 153 |  |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 299 | 194 |
With no related allowance recorded, Unpaid Principal Balance | 299 | 194 |
With no related allowance recorded, Average Recorded Investment | 238 | 198 |
With no related allowance recorded, Interest Income Recognized | 19 | 11 |
With a specific allowance recorded, Average Recorded Investment |  | 140 |
Recorded Investment | 299 | 194 |
Unpaid Principal Balance | 299 | 194 |
Average Recorded Investment | 238 | 338 |
Interest Income Recognized | 19 | 11 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 982 | 1,031 |
With no related allowance recorded, Unpaid Principal Balance | 982 | 1,031 |
With no related allowance recorded, Average Recorded Investment | 637 | 438 |
With no related allowance recorded, Interest Income Recognized | 66 | 25 |
With a specific allowance recorded, Recorded Investment | 227 | 72 |
With a specific allowance recorded, Unpaid Principal Balance | 377 | 72 |
Related Allowance | 142 | 5 |
With a specific allowance recorded, Average Recorded Investment | 555 | 445 |
With a specific allowance recorded, Interest Income Recognized |  | 2 |
Recorded Investment | 1,209 | 1,103 |
Unpaid Principal Balance | 1,359 | 1,103 |
Average Recorded Investment | 1,192 | 883 |
Interest Income Recognized | 66 | $ 27 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
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 | 3 |  |
Recorded Investment | 33 |  |
Unpaid Principal Balance | 33 |  |
Average Recorded Investment | $ 3 |  |

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