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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, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 5,121 | $ 5,738
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 6,145 | 6,823
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 1,418 | 1,616
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,972 | 1,699
Impaired financing receivables, with an allowance recorded, Related Allowance | 188 | 263
Impaired financing receivables, Recorded Investment, Total | 6,539 | 7,354
Impaired financing receivables, Unpaid Principal Balance, Total | 8,117 | 8,522
Impaired financing receivables, Related Allowance, Total | 188 | 263
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,230 | 851
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,751 | 1,034
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 753 | 22
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,303 | 23
Impaired financing receivables, with an allowance recorded, Related Allowance | 82 | 23
Impaired financing receivables, Recorded Investment, Total | 1,983 | 873
Impaired financing receivables, Unpaid Principal Balance, Total | 3,054 | 1,057
Impaired financing receivables, Related Allowance, Total | 82 | 23
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,658 | 1,224
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,803 | 1,343
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 238 | 917
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 238 | 999
Impaired financing receivables, with an allowance recorded, Related Allowance | 4 | 103
Impaired financing receivables, Recorded Investment, Total | 1,896 | 2,141
Impaired financing receivables, Unpaid Principal Balance, Total | 2,041 | 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 | 359 | 1,742
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 386 | 1,826
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 359 | 1,742
Impaired financing receivables, Unpaid Principal Balance, Total | 386 | 1,826
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,259 | 965
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,590 | 1,591
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 427 | 677
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 431 | 677
Impaired financing receivables, with an allowance recorded, Related Allowance | 102 | 137
Impaired financing receivables, Recorded Investment, Total | 1,686 | 1,642
Impaired financing receivables, Unpaid Principal Balance, Total | 2,021 | 2,268
Impaired financing receivables, Related Allowance, Total | 102 | 137
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 614 | 953
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 614 | 1,026
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 614 | 953
Impaired financing receivables, Unpaid Principal Balance, Total | 614 | 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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