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Allowance for Loan Losses - Impaired Loans - Average Recorded Investment and Interest Income Recognized (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | $ 1,632 | $ 2,859 | $ 3,085
Interest Income Recognized | 74 | 116 | 172
Commercial and Agriculture [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 15 | 88 | 367
Interest Income Recognized |  | 4 | 33
Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 396 | 520 | 456
Interest Income Recognized | 18 | 27 | 32
Commercial Real Estate Non Owner Occupied [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 23 | 243 | 308
Interest Income Recognized | 1 | 16 | 20
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 629 | 1,361 | 1,271
Interest Income Recognized | 31 | 43 | 58
Farm Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Average Recorded Investment | 569 | 647 | 683
Interest Income Recognized | $ 24 | $ 26 | $ 29

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- Definition 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. + Details
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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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