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Allowance for Loan Losses - Impaired Loans Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 6,494 | $ 5,738
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 8,273 | 6,823
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 720 | 1,747
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 739 | 1,705
Impaired financing receivables, with an allowance recorded, Related Allowance | 117 | 386
Impaired financing receivables, Recorded Investment, Total | 7,214 | 7,485
Impaired financing receivables, Unpaid Principal Balance, Total | 9,012 | 8,528
Impaired financing receivables, Related Allowance, Total | 117 | 386
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 2,386 | 851
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 3,457 | 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 |  | 23
Impaired financing receivables, with an allowance recorded, Related Allowance |  | 23
Impaired financing receivables, Recorded Investment, Total | 2,386 | 873
Impaired financing receivables, Unpaid Principal Balance, Total | 3,457 | 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 | 1,697 | 1,224
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,842 | 1,343
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 242 | 917
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 242 | 999
Impaired financing receivables, with an allowance recorded, Related Allowance | 4 | 103
Impaired financing receivables, Recorded Investment, Total | 1,939 | 2,141
Impaired financing receivables, Unpaid Principal Balance, Total | 2,084 | 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 | 369 | 1,742
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 396 | 1,826
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 369 | 1,742
Impaired financing receivables, Unpaid Principal Balance, Total | 396 | 1,826
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,376 | 965
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,912 | 1,591
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 478 | 808
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 497 | 683
Impaired financing receivables, with an allowance recorded, Related Allowance | 113 | 260
Impaired financing receivables, Recorded Investment, Total | 1,854 | 1,773
Impaired financing receivables, Unpaid Principal Balance, Total | 2,409 | 2,274
Impaired financing receivables, Related Allowance, Total | 113 | 260
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 665 | 953
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 665 | 1,026
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 665 | 953
Impaired financing receivables, Unpaid Principal Balance, Total | 665 | 1,026
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1 | 3
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1 | 3
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 1 | 3
Impaired financing receivables, Unpaid Principal Balance, Total | $ 1 | $ 3

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