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Allowance for Loan Losses - Impaired Financing Receivables Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 3,146 | $ 1,864
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 3,218 | 1,939
Impaired financing receivables, with an allowance recorded, Recorded Investment | 451 | 993
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 455 | 996
Impaired financing receivables, with an allowance recorded, Related Allowance | 91 | 141
Impaired financing receivables, Recorded Investment, Total | 3,597 | 2,857
Impaired financing receivables, Unpaid Principal Balance, Total | 3,673 | 2,935
Impaired financing receivables, Related Allowance, Total | 91 | 141
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 367 | 367
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 367 | 367
Impaired financing receivables, Recorded Investment, Total | 367 | 367
Impaired financing receivables, Unpaid Principal Balance, Total | 367 | 367
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 168 | 193
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 168 | 193
Impaired financing receivables, with an allowance recorded, Recorded Investment | 258 | 291
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 258 | 291
Impaired financing receivables, with an allowance recorded, Related Allowance | 9 | 12
Impaired financing receivables, Recorded Investment, Total | 426 | 484
Impaired financing receivables, Unpaid Principal Balance, Total | 426 | 484
Impaired financing receivables, Related Allowance, Total | 9 | 12
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 374 | 31
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 374 | 34
Impaired financing receivables, Recorded Investment, Total | 374 | 31
Impaired financing receivables, Unpaid Principal Balance, Total | 374 | 34
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,571 | 1,017
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,643 | 1,089
Impaired financing receivables, with an allowance recorded, Recorded Investment | 193 | 262
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 197 | 265
Impaired financing receivables, with an allowance recorded, Related Allowance | 82 | 122
Impaired financing receivables, Recorded Investment, Total | 1,764 | 1,279
Impaired financing receivables, Unpaid Principal Balance, Total | 1,840 | 1,354
Impaired financing receivables, Related Allowance, Total | 82 | 122
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 666 | 256
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 666 | 256
Impaired financing receivables, with an allowance recorded, Recorded Investment |  | 440
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance |  | 440
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 7
Impaired financing receivables, Recorded Investment, Total | 666 | 696
Impaired financing receivables, Unpaid Principal Balance, Total | $ 666 | 696
Impaired financing receivables, Related Allowance, Total |  | $ 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=118936363&loc=SL6953550-111524 + Details
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