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Allowance for Loan Losses - Impaired Loans Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 998 | $ 1,012
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,023 | 1,037
Impaired financing receivables, with an allowance recorded, Recorded Investment | 204 | 210
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 208 | 214
Impaired financing receivables, with an allowance recorded, Related Allowance | 18 | 18
Impaired financing receivables, Recorded Investment, Total | 1,202 | 1,222
Impaired financing receivables, Unpaid Principal Balance, Total | 1,231 | 1,251
Impaired financing receivables, Related Allowance, Total | 18 | 18
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 491 | 503
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 516 | 528
Impaired financing receivables, with an allowance recorded, Recorded Investment | 23 | 23
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 27 | 27
Impaired financing receivables, with an allowance recorded, Related Allowance | 12 | 11
Impaired financing receivables, Recorded Investment, Total | 514 | 526
Impaired financing receivables, Unpaid Principal Balance, Total | 543 | 555
Impaired financing receivables, Related Allowance, Total | 12 | 11
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 507 | 509
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 507 | 509
Impaired financing receivables, Recorded Investment, Total | 507 | 509
Impaired financing receivables, Unpaid Principal Balance, Total | 507 | 509
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with an allowance recorded, Recorded Investment | 181 | 187
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 181 | 187
Impaired financing receivables, with an allowance recorded, Related Allowance | 6 | 7
Impaired financing receivables, Recorded Investment, Total | 181 | 187
Impaired financing receivables, Unpaid Principal Balance, Total | 181 | 187
Impaired financing receivables, Related Allowance, Total | $ 6 | $ 7

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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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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 + Details
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