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Loans - Schedule of Loan Modifications (Detail) | 3 Months Ended
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Mar. 31, 2020 USD ($) Loan | Mar. 31, 2019 Contract
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Contract |  | 1
Balance | $ 0 |
CARESAct [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Loan | 66 |
Balance | $ 39,921,000 |
Weighted Average Interest Rate | 4.82% |
Commercial and Agriculture [Member] | CARESAct [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Loan | 26 |
Balance | $ 5,449,000 |
Weighted Average Interest Rate | 4.65% |
Commercial Real Estate Owner Occupied [Member] | CARESAct [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Loan | 25 |
Balance | $ 10,077,000 |
Weighted Average Interest Rate | 4.82% |
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Contract |  | 1
Commercial Real Estate Non Owner Occupied [Member] | CARESAct [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Loan | 12 |
Balance | $ 24,122,000 |
Weighted Average Interest Rate | 4.86% |
Residential Real Estate [Member] | CARESAct [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Loan | 2 |
Balance | $ 184,000 |
Weighted Average Interest Rate | 4.91% |
Farm Real Estate [Member] | CARESAct [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of Loans | Loan | 1 |
Balance | $ 89,000 |
Weighted Average Interest Rate | 5.00% |

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