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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, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 1,862 | $ 5,121
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,158 | 6,145
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,598 | 1,418
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,602 | 1,972
Impaired financing receivables, with an allowance recorded, Related Allowance | 125 | 188
Impaired financing receivables, Recorded Investment, Total | 3,460 | 6,539
Impaired financing receivables, Unpaid Principal Balance, Total | 3,760 | 8,117
Impaired financing receivables, Related Allowance, Total | 125 | 188
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment |  | 1,230
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance |  | 1,751
Impaired financing receivables, with an allowance recorded, Recorded Investment | 438 | 753
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 438 | 1,303
Impaired financing receivables, with an allowance recorded, Related Allowance | 4 | 82
Impaired financing receivables, Recorded Investment, Total | 438 | 1,983
Impaired financing receivables, Unpaid Principal Balance, Total | 438 | 3,054
Impaired financing receivables, Related Allowance, Total | 4 | 82
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 693 | 1,658
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 913 | 1,803
Impaired financing receivables, with an allowance recorded, Recorded Investment | 317 | 238
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 317 | 238
Impaired financing receivables, with an allowance recorded, Related Allowance | 6 | 4
Impaired financing receivables, Recorded Investment, Total | 1,010 | 1,896
Impaired financing receivables, Unpaid Principal Balance, Total | 1,230 | 2,041
Impaired financing receivables, Related Allowance, Total | 6 | 4
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 44 | 359
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 48 | 386
Impaired financing receivables, Recorded Investment, Total | 44 | 359
Impaired financing receivables, Unpaid Principal Balance, Total | 48 | 386
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 977 | 1,259
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,049 | 1,590
Impaired financing receivables, with an allowance recorded, Recorded Investment | 383 | 427
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 387 | 431
Impaired financing receivables, with an allowance recorded, Related Allowance | 109 | 102
Impaired financing receivables, Recorded Investment, Total | 1,360 | 1,686
Impaired financing receivables, Unpaid Principal Balance, Total | 1,436 | 2,021
Impaired financing receivables, Related Allowance, Total | 109 | 102
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 148 | 614
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 148 | 614
Impaired financing receivables, with an allowance recorded, Recorded Investment | 460 |
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 460 |
Impaired financing receivables, with an allowance recorded, Related Allowance | 6 |
Impaired financing receivables, Recorded Investment, Total | 608 | 614
Impaired financing receivables, Unpaid Principal Balance, Total | 608 | 614
Impaired financing receivables, Related Allowance, Total | $ 6 |
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment |  | 1
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance |  | 1
Impaired financing receivables, Recorded Investment, Total |  | 1
Impaired financing receivables, Unpaid Principal Balance, Total |  | $ 1

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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://www.xbrl.org/2003/role/presentationRef -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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