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Allowance for Loan Losses - Impaired Financing Receivables - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 5,738 | $ 6,328
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 6,823 | 8,463
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,747 | 4,821
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,705 | 5,209
Impaired financing receivables, with an allowance recorded, Related Allowance | 386 | 1,023
Impaired financing receivables, Recorded Investment, Total | 7,485 | 11,149
Impaired financing receivables, Unpaid Principal Balance, Total | 8,528 | 13,672
Impaired financing receivables, Related Allowance, Total | 386 | 1,023
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 851 | 1,377
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,034 | 1,504
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 22 | 927
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 23 | 1,056
Impaired financing receivables, with an allowance recorded, Related Allowance | 23 | 641
Impaired financing receivables, Recorded Investment, Total | 873 | 2,304
Impaired financing receivables, Unpaid Principal Balance, Total | 1,057 | 2,560
Impaired financing receivables, Related Allowance, Total | 23 | 641
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,224 | 2,961
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,343 | 3,327
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 917 | 388
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 999 | 387
Impaired financing receivables, with an allowance recorded, Related Allowance | 103 | 4
Impaired financing receivables, Recorded Investment, Total | 2,141 | 3,349
Impaired financing receivables, Unpaid Principal Balance, Total | 2,342 | 3,714
Impaired financing receivables, Related Allowance, Total | 103 | 4
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,742 | 92
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,826 | 140
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment |  | 2,083
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance |  | 2,287
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 20
Impaired financing receivables, Recorded Investment, Total | 1,742 | 2,175
Impaired financing receivables, Unpaid Principal Balance, Total | 1,826 | 2,427
Impaired financing receivables, Related Allowance, Total |  | 20
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 965 | 1,893
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,591 | 3,487
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 808 | 1,215
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 683 | 1,223
Impaired financing receivables, with an allowance recorded, Related Allowance | 260 | 305
Impaired financing receivables, Recorded Investment, Total | 1,773 | 3,108
Impaired financing receivables, Unpaid Principal Balance, Total | 2,274 | 4,710
Impaired financing receivables, Related Allowance, Total | 260 | 305
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 953 |
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,026 |
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment |  | 208
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance |  | 256
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 53
Impaired financing receivables, Recorded Investment, Total | 953 | 208
Impaired financing receivables, Unpaid Principal Balance, Total | 1,026 | 256
Impaired financing receivables, Related Allowance, Total |  | 53
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 3 | 5
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 3 | 5
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 3 | 5
Impaired financing receivables, Unpaid Principal Balance, Total | $ 3 | $ 5

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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=49124121&loc=SL6953550-111524 + Details
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