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Allowance for Loan Losses - Impaired Financing Receivables Excluding PCI Loans - Recorded Investment and Unpaid Principal Balances (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | $ 4,122 | $ 5,121
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 4,383 | 6,145
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 2,104 | 1,418
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 2,658 | 1,972
Impaired financing receivables, with an allowance recorded, Related Allowance | 439 | 188
Impaired financing receivables, Recorded Investment, Total | 6,226 | 6,539
Impaired financing receivables, Unpaid Principal Balance, Total | 7,041 | 8,117
Impaired financing receivables, Related Allowance, Total | 439 | 188
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 979 | 1,230
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 979 | 1,751
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 743 | 753
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 1,293 | 1,303
Impaired financing receivables, with an allowance recorded, Related Allowance | 243 | 82
Impaired financing receivables, Recorded Investment, Total | 1,722 | 1,983
Impaired financing receivables, Unpaid Principal Balance, Total | 2,272 | 3,054
Impaired financing receivables, Related Allowance, Total | 243 | 82
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 953 | 1,658
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 988 | 1,803
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 922 | 238
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 922 | 238
Impaired financing receivables, with an allowance recorded, Related Allowance | 81 | 4
Impaired financing receivables, Recorded Investment, Total | 1,875 | 1,896
Impaired financing receivables, Unpaid Principal Balance, Total | 1,910 | 2,041
Impaired financing receivables, Related Allowance, Total | 81 | 4
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 358 | 359
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 385 | 386
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 358 | 359
Impaired financing receivables, Unpaid Principal Balance, Total | 385 | 386
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 1,218 | 1,259
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 1,417 | 1,590
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, with an allowance recorded, Recorded Investment | 439 | 427
Impaired financing receivables, with an allowance recorded, Unpaid Principal Balance | 443 | 431
Impaired financing receivables, with an allowance recorded, Related Allowance | 115 | 102
Impaired financing receivables, Recorded Investment, Total | 1,657 | 1,686
Impaired financing receivables, Unpaid Principal Balance, Total | 1,860 | 2,021
Impaired financing receivables, Related Allowance, Total | 115 | 102
Farm Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, with no related allowance recorded, Recorded Investment | 614 | 614
Impaired financing receivables, with no related allowance recorded, Unpaid Principal Balance | 614 | 614
Impaired financing receivables, with no related allowance recorded, Related Allowance | 0 | 0
Impaired financing receivables, Recorded Investment, Total | 614 | 614
Impaired financing receivables, Unpaid Principal Balance, Total | 614 | 614
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, with no related allowance recorded, Related Allowance | $ 0 | 0
Impaired financing receivables, Recorded Investment, Total |  | 1
Impaired financing receivables, Unpaid Principal Balance, Total |  | $ 1

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