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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

Impaired financing receivable with and no related allowance.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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Amount of allowance for credit losses related to recorded investment.

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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

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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

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+ References

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-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

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Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 14A
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524

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