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Allowance for Loan Losses - Impaired Financing Receivables - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 8,615 | $ 5,738
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 9,840 | 6,823
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 804 | 1,747
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 845 | 1,705
Impaired financing receivables, with an allowance recorded, Related Allowance | 190 | 386
Impaired financing receivables, Recorded Investment, Total | 9,419 | 7,485
Impaired financing receivables, Unpaid Principal Balance, Total | 10,685 | 8,528
Impaired financing receivables, Related Allowance, Total | 190 | 386
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 2,521 | 851
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 3,071 | 1,034
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment |  | 22
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 22 | 23
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 23
Impaired financing receivables, Recorded Investment, Total | 2,521 | 873
Impaired financing receivables, Unpaid Principal Balance, Total | 3,093 | 1,057
Impaired financing receivables, Related Allowance, Total |  | 23
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,399 | 1,224
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,434 | 1,343
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 251 | 917
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 251 | 999
Impaired financing receivables, with an allowance recorded, Related Allowance | 4 | 103
Impaired financing receivables, Recorded Investment, Total | 1,650 | 2,141
Impaired financing receivables, Unpaid Principal Balance, Total | 1,685 | 2,342
Impaired financing receivables, Related Allowance, Total | 4 | 103
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,921 | 1,742
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,924 | 1,826
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 61 |
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 61 |
Impaired financing receivables, with an allowance recorded, Related Allowance | 23 |
Impaired financing receivables, Recorded Investment, Total | 1,982 | 1,742
Impaired financing receivables, Unpaid Principal Balance, Total | 1,985 | 1,826
Impaired financing receivables, Related Allowance, Total | 23 |
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,373 | 965
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 2,010 | 1,591
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 492 | 808
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 511 | 683
Impaired financing receivables, with an allowance recorded, Related Allowance | 163 | 260
Impaired financing receivables, Recorded Investment, Total | 1,865 | 1,773
Impaired financing receivables, Unpaid Principal Balance, Total | 2,521 | 2,274
Impaired financing receivables, Related Allowance, Total | 163 | 260
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,398 | 953
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,398 | 1,026
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 1,398 | 953
Impaired financing receivables, Unpaid Principal Balance, Total | 1,398 | 1,026
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 3 | 3
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 3 | 3
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 3 | 3
Impaired financing receivables, Unpaid Principal Balance, Total | $ 3 | $ 3

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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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