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Allowance for Loan Losses - Impaired Loans Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 1,738 | $ 1,012
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,763 | 1,037
Impaired financing receivables, with an allowance recorded, Recorded Investment | 164 | 210
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 168 | 214
Impaired financing receivables, with an allowance recorded, Related Allowance | 7 | 18
Impaired financing receivables, Recorded Investment, Total | 1,902 | 1,222
Impaired financing receivables, Unpaid Principal Balance, Total | 1,931 | 1,251
Impaired financing receivables, Related Allowance, Total | 7 | 18
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 343 |
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 343 |
Impaired financing receivables, Recorded Investment, Total | 343 |
Impaired financing receivables, Unpaid Principal Balance, Total | 343 |
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 676 |
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 676 |
Impaired financing receivables, with an allowance recorded, Recorded Investment | 157 | 187
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 157 | 187
Impaired financing receivables, with an allowance recorded, Related Allowance | 6 | 7
Impaired financing receivables, Recorded Investment, Total | 833 | 187
Impaired financing receivables, Unpaid Principal Balance, Total | 833 | 187
Impaired financing receivables, Related Allowance, Total | 6 | 7
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 140 |
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 140 |
Impaired financing receivables, Recorded Investment, Total | 140 |
Impaired financing receivables, Unpaid Principal Balance, Total | 140 |
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 579 | 503
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 604 | 528
Impaired financing receivables, with an allowance recorded, Recorded Investment | 7 | 23
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 11 | 27
Impaired financing receivables, with an allowance recorded, Related Allowance | 1 | 11
Impaired financing receivables, Recorded Investment, Total | 586 | 526
Impaired financing receivables, Unpaid Principal Balance, Total | 615 | 555
Impaired financing receivables, Related Allowance, Total | $ 1 | 11
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment |  | 509
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance |  | 509
Impaired financing receivables, Recorded Investment, Total |  | 509
Impaired financing receivables, Unpaid Principal Balance, Total |  | $ 509

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524 + Details
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