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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, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 1,048 | $ 2,338
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,073 | 2,363
Impaired financing receivables, with an allowance recorded, Recorded Investment | 224 | 328
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 227 | 332
Impaired financing receivables, with an allowance recorded, Related Allowance | 73 | 107
Impaired financing receivables, Recorded Investment, Total | 1,272 | 2,666
Impaired financing receivables, Unpaid Principal Balance, Total | 1,300 | 2,695
Impaired financing receivables, Related Allowance, Total | 73 | 107
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with an allowance recorded, Recorded Investment |  | 74
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance |  | 74
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 73
Impaired financing receivables, Recorded Investment, Total |  | 74
Impaired financing receivables, Unpaid Principal Balance, Total |  | 74
Impaired financing receivables, Related Allowance, Total |  | 73
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 12 | 757
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 12 | 757
Impaired financing receivables, with an allowance recorded, Recorded Investment | 193 | 223
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 193 | 223
Impaired financing receivables, with an allowance recorded, Related Allowance | 55 | 5
Impaired financing receivables, Recorded Investment, Total | 205 | 980
Impaired financing receivables, Unpaid Principal Balance, Total | 205 | 980
Impaired financing receivables, Related Allowance, Total | 55 | 5
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment |  | 48
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance |  | 48
Impaired financing receivables, Recorded Investment, Total |  | 48
Impaired financing receivables, Unpaid Principal Balance, Total |  | 48
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 514 | 915
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 539 | 940
Impaired financing receivables, with an allowance recorded, Recorded Investment | 31 | 31
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 34 | 35
Impaired financing receivables, with an allowance recorded, Related Allowance | 18 | 29
Impaired financing receivables, Recorded Investment, Total | 545 | 946
Impaired financing receivables, Unpaid Principal Balance, Total | 573 | 975
Impaired financing receivables, Related Allowance, Total | 18 | 29
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 522 | 618
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 522 | 618
Impaired financing receivables, Recorded Investment, Total | 522 | 618
Impaired financing receivables, Unpaid Principal Balance, Total | $ 522 | $ 618

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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 http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524 + Details
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