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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 515 | $ 1,257 | $ 1,483 | $ 515 | $ 1,483 | $ 1,257
With a specific allowance recorded, Recorded Investment | 891 | 879 | 1,058 | 891 | 1,058 | 879
With a specific allowance recorded, Related Allowance | 125 | 330 | 465 | 125 | 465 | 330
Recorded Investment | 1,406 | 2,136 | 2,541 | 1,406 | 2,541 | 2,136
Related Allowance | 125 | 330 | 465 | 125 | 465 | 330
Average Recorded Investment | 1,499 | $ 2,207 | 2,924 | 1,843 | 2,609 | $ 2,509
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 132 |  | 222 | 132 | 222 |
With no related allowance recorded, Unpaid Principal Balance | 132 |  | 222 | 132 | 222 |
With no related allowance recorded, Average Recorded Investment | 132 |  | 222 | 152 | 99 |
With no related allowance recorded, Interest Income Recognized |  |  |  | 1 |  |
With a specific allowance recorded, Average Recorded Investment |  |  |  | 13 |  |
Recorded Investment | 132 |  | 222 | 132 | 222 |
Unpaid Principal Balance | 132 |  | 222 | 132 | 222 |
Average Recorded Investment | 132 |  | 222 | 165 | 99 |
Interest Income Recognized |  |  |  | 1 |  |
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 383 |  | 201 | 383 | 201 |
With no related allowance recorded, Unpaid Principal Balance | 383 |  | 201 | 383 | 201 |
With no related allowance recorded, Average Recorded Investment | 51 |  | 159 | 78 | 159 |
With no related allowance recorded, Interest Income Recognized |  |  | 2 | 1 | 2 |
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 2 | 1 | 2 |
With a specific allowance recorded, Recorded Investment | 329 |  | 305 | 329 | 305 |
With a specific allowance recorded, Unpaid Principal Balance | 329 |  | 305 | 329 | 305 |
With a specific allowance recorded, Related Allowance | 35 |  | 76 | 35 | 76 |
With a specific allowance recorded, Average Recorded Investment | 377 |  | 182 | 387 | 133 |
With a specific allowance recorded, Interest Income Recognized | 4 |  | 1 | 11 | 8 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 1 |  |  | 7 | 7 |
Recorded Investment | 712 |  | 506 | 712 | 506 |
Unpaid Principal Balance | 712 |  | 506 | 712 | 506 |
Related Allowance | 35 |  | 76 | 35 | 76 |
Average Recorded Investment | 428 |  | 341 | 465 | 292 |
Interest Income Recognized | 4 |  | 3 | 12 | 10 |
Interest Income Recognized Cash Basis | 1 |  | 2 | 8 | 9 |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment |  |  | 482 |  | 482 |
With no related allowance recorded, Unpaid Principal Balance |  |  | 482 |  | 482 |
With no related allowance recorded, Average Recorded Investment | 345 |  | 567 | 367 | 400 |
With no related allowance recorded, Interest Income Recognized | 4 |  | 10 | 17 | 10 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 4 |  | 10 | 16 | 10 |
With a specific allowance recorded, Recorded Investment | 444 |  | 560 | 444 | 560 |
With a specific allowance recorded, Unpaid Principal Balance | 444 |  | 560 | 444 | 560 |
With a specific allowance recorded, Related Allowance | 68 |  | 201 | 68 | 201 |
With a specific allowance recorded, Average Recorded Investment | 30 |  | 1,013 | 254 | 1,069 |
Recorded Investment | 444 |  | 1,042 | 444 | 1,042 |
Unpaid Principal Balance | 444 |  | 1,042 | 444 | 1,042 |
Related Allowance | 68 |  | 201 | 68 | 201 |
Average Recorded Investment | 375 |  | 1,580 | 621 | 1,469 |
Interest Income Recognized | 4 |  | 10 | 17 | 10 |
Interest Income Recognized Cash Basis | 4 |  | 10 | 16 | 10 |
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Interest Income Recognized |  |  |  |  | 13 |
With a specific allowance recorded, Average Recorded Investment |  |  |  |  | 2 |
Average Recorded Investment |  |  |  |  | 2 |
Interest Income Recognized |  |  |  |  | 13 |
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment |  |  | 578 |  | 578 |
With no related allowance recorded, Unpaid Principal Balance |  |  | 578 |  | 578 |
With no related allowance recorded, Average Recorded Investment | 446 |  | 462 | 450 | 420 |
With no related allowance recorded, Interest Income Recognized | 6 |  | 7 | 18 | 20 |
With a specific allowance recorded, Recorded Investment | 118 |  | 193 | 118 | 193 |
With a specific allowance recorded, Unpaid Principal Balance | 118 |  | 193 | 118 | 193 |
With a specific allowance recorded, Related Allowance | 22 |  | 188 | 22 | 188 |
With a specific allowance recorded, Average Recorded Investment | 118 |  | 319 | 142 | 327 |
Recorded Investment | 118 |  | 771 | 118 | 771 |
Unpaid Principal Balance | 118 |  | 771 | 118 | 771 |
Related Allowance | 22 |  | 188 | 22 | 188 |
Average Recorded Investment | 564 |  | 781 | 592 | 747 |
Interest Income Recognized | $ 6 |  | $ 7 | $ 18 | $ 20 |

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