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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | $ 1,237 | $ 2,093
Interest Income Recognized | 16 | 21
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment |  | 37
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 193 | 644
Interest Income Recognized | 3 | 6
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment |  | 43
Interest Income Recognized |  | 1
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 530 | 758
Interest Income Recognized | 7 | 8
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Average Recorded Investment | 514 | 611
Interest Income Recognized | $ 6 | $ 6

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- Definition Average 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524 + Details
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