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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, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 2,753 | $ 3,146
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,825 | 3,218
Impaired financing receivables, with an allowance recorded, Recorded Investment | 440 | 451
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 444 | 455
Impaired financing receivables, with an allowance recorded, Related Allowance | 92 | 91
Impaired financing receivables, Recorded Investment, Total | 3,193 | 3,597
Impaired financing receivables, Unpaid Principal Balance, Total | 3,269 | 3,673
Impaired financing receivables, Related Allowance, Total | 92 | 91
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment |  | 367
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance |  | 367
Impaired financing receivables, Recorded Investment, Total |  | 367
Impaired financing receivables, Unpaid Principal Balance, Total |  | 367
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 162 | 168
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 162 | 168
Impaired financing receivables, with an allowance recorded, Recorded Investment | 253 | 258
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 253 | 258
Impaired financing receivables, with an allowance recorded, Related Allowance | 9 | 9
Impaired financing receivables, Recorded Investment, Total | 415 | 426
Impaired financing receivables, Unpaid Principal Balance, Total | 415 | 426
Impaired financing receivables, Related Allowance, Total | 9 | 9
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 371 | 374
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 371 | 374
Impaired financing receivables, Recorded Investment, Total | 371 | 374
Impaired financing receivables, Unpaid Principal Balance, Total | 371 | 374
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,555 | 1,571
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,627 | 1,643
Impaired financing receivables, with an allowance recorded, Recorded Investment | 187 | 193
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 191 | 197
Impaired financing receivables, with an allowance recorded, Related Allowance | 83 | 82
Impaired financing receivables, Recorded Investment, Total | 1,742 | 1,764
Impaired financing receivables, Unpaid Principal Balance, Total | 1,818 | 1,840
Impaired financing receivables, Related Allowance, Total | 83 | 82
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 665 | 666
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 665 | 666
Impaired financing receivables, Recorded Investment, Total | 665 | 666
Impaired financing receivables, Unpaid Principal Balance, Total | $ 665 | $ 666

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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=118936363&loc=SL6953550-111524 + Details
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