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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | $ 1,099 | $ 1,141 | $ 1,042 | $ 1,141
With a specific allowance recorded, Recorded Investment | 694 | 711 | 1,169 | 711
With no related allowance recorded, Recorded Investment | 1,099 | 1,141 | 1,042 | 1,141
With a specific allowance recorded, Related Allowance | 117 | 135 | 426 | 135
Recorded Investment | 1,793 | 1,852 | 2,211 | 1,852
Related Allowance | 117 | 135 | 426 | 135
Average Recorded Investment | 1,832 | $ 1,684 | 2,130 | $ 1,802
Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 101 |  | 162 |
With no related allowance recorded, Unpaid Principal Balance | 101 |  | 162 |
With no related allowance recorded, Average Recorded Investment | 121 |  | 162 |
With a specific allowance recorded, Recorded Investment |  |  | 57 |
With no related allowance recorded, Recorded Investment | 101 |  | 162 |
With a specific allowance recorded, Unpaid Principal Balance |  |  | 57 |
With no related allowance recorded, Unpaid Principal Balance | 101 |  | 162 |
With a specific allowance recorded, Related Allowance |  |  | 57 |
With no related allowance recorded, Average Recorded Investment | 121 |  | 162 |
With a specific allowance recorded, Average Recorded Investment |  |  | 38 |
With a specific allowance recorded, Interest Income Recognized |  |  | 1 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 0 |  | 0 |
Recorded Investment | 101 |  | 219 |
Unpaid Principal Balance | 101 |  | 219 |
Related Allowance |  |  | 57 |
Average Recorded Investment | 121 |  | 200 |
Interest Income Recognized |  |  | 1 |
Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 0 |  | 0 |
Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 998 |  | 365 |
With no related allowance recorded, Unpaid Principal Balance | 998 |  | 365 |
With no related allowance recorded, Average Recorded Investment | 1,003 |  | 156 |
With no related allowance recorded, Interest Income Recognized | 8 |  | 3 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 6 |  | 3 |
With a specific allowance recorded, Recorded Investment | 83 |  | 509 |
With no related allowance recorded, Recorded Investment | 998 |  | 365 |
With a specific allowance recorded, Unpaid Principal Balance | 83 |  | 628 |
With no related allowance recorded, Unpaid Principal Balance | 998 |  | 365 |
With a specific allowance recorded, Related Allowance | 23 |  | 104 |
With no related allowance recorded, Average Recorded Investment | 1,003 |  | 156 |
With a specific allowance recorded, Average Recorded Investment | 94 |  | 307 |
With no related allowance recorded, Interest Income Recognized | 8 |  | 3 |
With a specific allowance recorded, Interest Income Recognized |  |  | 1 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 6 |  | 3 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 0 |  | 0 |
Recorded Investment | 1,081 |  | 874 |
Unpaid Principal Balance | 1,081 |  | 993 |
Related Allowance | 23 |  | 104 |
Average Recorded Investment | 1,097 |  | 463 |
Interest Income Recognized | 8 |  | 4 |
Interest Income Recognized Cash Basis | 6 |  | 3 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment |  |  | 515 |
With no related allowance recorded, Unpaid Principal Balance |  |  | 515 |
With no related allowance recorded, Average Recorded Investment |  |  | 409 |
With no related allowance recorded, Interest Income Recognized |  |  | 8 |
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 7 |
With a specific allowance recorded, Recorded Investment | 496 |  | 422 |
With no related allowance recorded, Recorded Investment |  |  | 515 |
With a specific allowance recorded, Unpaid Principal Balance | 496 |  | 422 |
With no related allowance recorded, Unpaid Principal Balance |  |  | 515 |
With a specific allowance recorded, Related Allowance | 61 |  | 152 |
With no related allowance recorded, Average Recorded Investment |  |  | 409 |
With a specific allowance recorded, Average Recorded Investment | 498 |  | 422 |
With no related allowance recorded, Interest Income Recognized |  |  | 8 |
With a specific allowance recorded, Interest Income Recognized | 5 |  |  |
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 7 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 0 |  | 0 |
Recorded Investment | 496 |  | 937 |
Unpaid Principal Balance | 496 |  | 937 |
Related Allowance | 61 |  | 152 |
Average Recorded Investment | 498 |  | 831 |
Interest Income Recognized | 5 |  | 8 |
Interest Income Recognized Cash Basis |  |  | 7 |
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 0 |  | 0 |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Average Recorded Investment |  |  | 454 |
With no related allowance recorded, Interest Income Recognized |  |  | 6 |
With a specific allowance recorded, Recorded Investment | 115 |  | 181 |
With a specific allowance recorded, Unpaid Principal Balance | 115 |  | 239 |
With a specific allowance recorded, Related Allowance | 33 |  | 113 |
With no related allowance recorded, Average Recorded Investment |  |  | 454 |
With a specific allowance recorded, Average Recorded Investment | 116 |  | 182 |
With no related allowance recorded, Interest Income Recognized |  |  | 6 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 0 |  | 0 |
Recorded Investment | 115 |  | 181 |
Unpaid Principal Balance | 115 |  | 239 |
Related Allowance | 33 |  | 113 |
Average Recorded Investment | $ 116 |  | 636 |
Interest Income Recognized |  |  | $ 6 |

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