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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 1,024 | $ 1,141 | $ 997 | $ 1,024 | $ 997 | $ 1,141
With a specific allowance recorded, Recorded Investment | 691 | 711 | 622 | 691 | 622 | 711
Related Allowance | 115 | 135 | 217 | 115 | 217 | 135
Recorded Investment | 1,715 | 1,852 | 1,619 | 1,715 | 1,619 | 1,852
Related Allowance | 115 | 135 | 217 | 115 | 217 | 135
Average Recorded Investment | 1,744 | $ 1,684 | 1,899 | 1,789 | 1,995 | $ 1,802
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 101 |  | 162 | 101 | 162 |
With no related allowance recorded, Unpaid Principal Balance | 101 |  | 162 | 101 | 162 |
With no related allowance recorded, Average Recorded Investment | 101 |  | 162 | 111 | 162 |
With no related allowance recorded, Interest Income Recognized |  |  |  |  | 1 |
Recorded Investment | 101 |  | 162 | 101 | 162 |
Unpaid Principal Balance | 101 |  | 162 | 101 | 162 |
Average Recorded Investment | 101 |  | 162 | 111 | 162 |
Interest Income Recognized |  |  |  |  | 1 |
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 923 |  | 40 | 923 | 40 |
With no related allowance recorded, Unpaid Principal Balance | 923 |  | 40 | 923 | 40 |
With no related allowance recorded, Average Recorded Investment | 948 |  | 25 | 976 | 91 |
With no related allowance recorded, Interest Income Recognized | 8 |  |  | 16 |  |
With no related allowance recorded, Interest Income Recognized Cash Basis | 6 |  |  | 12 |  |
With a specific allowance recorded, Recorded Investment | 85 |  | 414 | 85 | 414 |
With a specific allowance recorded, Unpaid Principal Balance | 85 |  | 414 | 85 | 414 |
Related Allowance | 25 |  | 61 | 25 | 61 |
With a specific allowance recorded, Average Recorded Investment | 87 |  | 478 | 90 | 392 |
With a specific allowance recorded, Interest Income Recognized |  |  | 7 |  | 11 |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  | 6 |  | 9 |
Recorded Investment | 1,008 |  | 454 | 1,008 | 454 |
Unpaid Principal Balance | 1,008 |  | 454 | 1,008 | 454 |
Related Allowance | 25 |  | 61 | 25 | 61 |
Average Recorded Investment | 1,035 |  | 503 | 1,066 | 483 |
Interest Income Recognized | 8 |  | 7 | 16 | 11 |
Interest Income Recognized Cash Basis | 6 |  | 6 | 12 | 9 |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment |  |  | 346 |  | 346 |
With no related allowance recorded, Unpaid Principal Balance |  |  | 346 |  | 346 |
With no related allowance recorded, Average Recorded Investment |  |  | 346 |  | 378 |
With no related allowance recorded, Interest Income Recognized |  |  | 6 |  | 14 |
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 6 |  | 13 |
With a specific allowance recorded, Recorded Investment | 492 |  | 90 | 492 | 90 |
With a specific allowance recorded, Unpaid Principal Balance | 492 |  | 90 | 492 | 90 |
Related Allowance | 57 |  | 90 | 57 | 90 |
With a specific allowance recorded, Average Recorded Investment | 493 |  | 311 | 496 | 366 |
With a specific allowance recorded, Interest Income Recognized | 7 |  |  | 13 |  |
Recorded Investment | 492 |  | 436 | 492 | 436 |
Unpaid Principal Balance | 492 |  | 436 | 492 | 436 |
Related Allowance | 57 |  | 90 | 57 | 90 |
Average Recorded Investment | 493 |  | 657 | 496 | 744 |
Interest Income Recognized | 7 |  | 6 | 13 | 14 |
Interest Income Recognized Cash Basis |  |  | 6 |  | 13 |
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment |  |  | 449 |  | 449 |
With no related allowance recorded, Unpaid Principal Balance |  |  | 449 |  | 449 |
With no related allowance recorded, Average Recorded Investment |  |  | 450 |  | 452 |
With no related allowance recorded, Interest Income Recognized |  |  | 6 |  | 12 |
With a specific allowance recorded, Recorded Investment | 114 |  | 118 | 114 | 118 |
With a specific allowance recorded, Unpaid Principal Balance | 114 |  | 118 | 114 | 118 |
Related Allowance | 33 |  | 66 | 33 | 66 |
With a specific allowance recorded, Average Recorded Investment | 115 |  | 127 | 116 | 154 |
Recorded Investment | 114 |  | 567 | 114 | 567 |
Unpaid Principal Balance | 114 |  | 567 | 114 | 567 |
Related Allowance | 33 |  | 66 | 33 | 66 |
Average Recorded Investment | $ 115 |  | 577 | $ 116 | 606 |
Interest Income Recognized |  |  | $ 6 |  | $ 12 |

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