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Allowance for Loan Losses - Impaired Loans Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 2,483 | $ 1,864
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,555 | 1,939
Impaired financing receivables, with an allowance recorded, Recorded Investment | 530 | 993
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 534 | 996
Impaired financing receivables, with an allowance recorded, Related Allowance | 107 | 141
Impaired financing receivables, Recorded Investment, Total | 3,013 | 2,857
Impaired financing receivables, Unpaid Principal Balance, Total | 3,089 | 2,935
Impaired financing receivables, Related Allowance, Total | 107 | 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 | 179 | 193
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 179 | 193
Impaired financing receivables, with an allowance recorded, Recorded Investment | 280 | 291
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 280 | 291
Impaired financing receivables, with an allowance recorded, Related Allowance | 10 | 12
Impaired financing receivables, Recorded Investment, Total | 459 | 484
Impaired financing receivables, Unpaid Principal Balance, Total | 459 | 484
Impaired financing receivables, Related Allowance, Total | 10 | 12
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 379 | 31
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 379 | 34
Impaired financing receivables, Recorded Investment, Total | 379 | 31
Impaired financing receivables, Unpaid Principal Balance, Total | 379 | 34
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 876 | 1,017
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 948 | 1,089
Impaired financing receivables, with an allowance recorded, Recorded Investment | 250 | 262
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 254 | 265
Impaired financing receivables, with an allowance recorded, Related Allowance | 97 | 122
Impaired financing receivables, Recorded Investment, Total | 1,126 | 1,279
Impaired financing receivables, Unpaid Principal Balance, Total | 1,202 | 1,354
Impaired financing receivables, Related Allowance, Total | 97 | 122
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 682 | 256
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 682 | 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 | 682 | 696
Impaired financing receivables, Unpaid Principal Balance, Total | $ 682 | 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=84173941&loc=SL6953550-111524 + Details
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