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Allowance for Loan Losses - Impaired Financing Receivables Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 2,101 | $ 1,862
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,176 | 2,158
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,852 | 1,598
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,856 | 1,602
Impaired financing receivables, with an allowance recorded, Related Allowance | 366 | 125
Impaired financing receivables, Recorded Investment, Total | 3,953 | 3,460
Impaired financing receivables, Unpaid Principal Balance, Total | 4,032 | 3,760
Impaired financing receivables, Related Allowance, Total | 366 | 125
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 390 |
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 390 |
Impaired financing receivables, with an allowance recorded, Recorded Investment |  | 438
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance |  | 438
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 4
Impaired financing receivables, Recorded Investment, Total | 390 | 438
Impaired financing receivables, Unpaid Principal Balance, Total | 390 | 438
Impaired financing receivables, Related Allowance, Total |  | 4
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 198 | 693
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 198 | 913
Impaired financing receivables, with an allowance recorded, Recorded Investment | 307 | 317
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 307 | 317
Impaired financing receivables, with an allowance recorded, Related Allowance | 10 | 6
Impaired financing receivables, Recorded Investment, Total | 505 | 1,010
Impaired financing receivables, Unpaid Principal Balance, Total | 505 | 1,230
Impaired financing receivables, Related Allowance, Total | 10 | 6
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 36 | 44
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 39 | 48
Impaired financing receivables, Recorded Investment, Total | 36 | 44
Impaired financing receivables, Unpaid Principal Balance, Total | 39 | 48
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,220 | 977
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,292 | 1,049
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,095 | 383
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,099 | 387
Impaired financing receivables, with an allowance recorded, Related Allowance | 350 | 109
Impaired financing receivables, Recorded Investment, Total | 2,315 | 1,360
Impaired financing receivables, Unpaid Principal Balance, Total | 2,391 | 1,436
Impaired financing receivables, Related Allowance, Total | 350 | 109
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 257 | 148
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 257 | 148
Impaired financing receivables, with an allowance recorded, Recorded Investment | 450 | 460
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 450 | 460
Impaired financing receivables, with an allowance recorded, Related Allowance | 6 | 6
Impaired financing receivables, Recorded Investment, Total | 707 | 608
Impaired financing receivables, Unpaid Principal Balance, Total | 707 | 608
Impaired financing receivables, Related Allowance, Total | $ 6 | $ 6

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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 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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