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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, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 1,483 | $ 675 | $ 1,209 | $ 1,483 | $ 1,209 | $ 675
With a specific allowance recorded, Recorded Investment | 1,058 | 1,168 | 477 | 1,058 | 477 | 1,168
With a specific allowance recorded, Related Allowance | 465 | 387 | 252 | 465 | 252 | 387
Recorded Investment | 2,541 | 1,843 | 1,686 | 2,541 | 1,686 | 1,843
Related Allowance | 465 | 387 | 252 | 465 | 252 | 387
Average Recorded Investment | 2,924 | $ 1,730 | 1,788 | 2,609 | 1,989 | $ 1,929
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 222 |  |  | 222 |  |
With no related allowance recorded, Unpaid Principal Balance | 222 |  |  | 222 |  |
With no related allowance recorded, Average Recorded Investment | 222 |  | 94 | 99 | 125 |
With no related allowance recorded, Interest Income Recognized |  |  | 7 |  | 8 |
Recorded Investment | 222 |  |  | 222 |  |
Unpaid Principal Balance | 222 |  |  | 222 |  |
Average Recorded Investment | 222 |  | 94 | 99 | 125 |
Interest Income Recognized |  |  | 7 |  | 8 |
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 201 |  | 26 | 201 | 26 |
With no related allowance recorded, Unpaid Principal Balance | 201 |  | 26 | 201 | 26 |
With no related allowance recorded, Average Recorded Investment | 159 |  | 26 | 159 | 38 |
With no related allowance recorded, Interest Income Recognized | 2 |  |  | 2 | 1 |
With no related allowance recorded, Interest Income Recognized on a Cash Basis | 2 |  |  | 2 |  |
With a specific allowance recorded, Recorded Investment | 305 |  | 139 | 305 | 139 |
With a specific allowance recorded, Unpaid Principal Balance | 305 |  | 139 | 305 | 139 |
With a specific allowance recorded, Related Allowance | 76 |  | 49 | 76 | 49 |
With a specific allowance recorded, Average Recorded Investment | 182 |  | 112 | 133 | 122 |
With a specific allowance recorded, Interest Income Recognized | 1 |  | 1 | 8 | 24 |
With a specific allowance recorded, Interest Income Recognized on a Cash Basis |  |  |  | 7 |  |
Recorded Investment | 506 |  | 165 | 506 | 165 |
Unpaid Principal Balance | 506 |  | 165 | 506 | 165 |
Related Allowance | 76 |  | 49 | 76 | 49 |
Average Recorded Investment | 341 |  | 138 | 292 | 160 |
Interest Income Recognized | 3 |  | 1 | 10 | 25 |
Interest Income Recognized on a Cash Basis | 2 |  |  | 9 |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 482 |  | 709 | 482 | 709 |
With no related allowance recorded, Unpaid Principal Balance | 482 |  | 709 | 482 | 709 |
With no related allowance recorded, Average Recorded Investment | 567 |  | 739 | 400 | 829 |
With no related allowance recorded, Interest Income Recognized | 10 |  |  | 10 | 9 |
With no related allowance recorded, Interest Income Recognized on a Cash Basis | 10 |  |  | 10 |  |
With a specific allowance recorded, Recorded Investment | 560 |  |  | 560 |  |
With a specific allowance recorded, Unpaid Principal Balance | 560 |  |  | 560 |  |
With a specific allowance recorded, Related Allowance | 201 |  |  | 201 |  |
With a specific allowance recorded, Average Recorded Investment | 1,013 |  |  | 1,069 | 32 |
Recorded Investment | 1,042 |  | 709 | 1,042 | 709 |
Unpaid Principal Balance | 1,042 |  | 709 | 1,042 | 709 |
Related Allowance | 201 |  |  | 201 |  |
Average Recorded Investment | 1,580 |  | 739 | 1,469 | 861 |
Interest Income Recognized | 10 |  |  | 10 | 9 |
Interest Income Recognized on a Cash Basis | 10 |  |  | 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 |  | 474 | 578 | 474 |
With no related allowance recorded, Unpaid Principal Balance | 578 |  | 474 | 578 | 474 |
With no related allowance recorded, Average Recorded Investment | 462 |  | 476 | 420 | 279 |
With no related allowance recorded, Interest Income Recognized | 7 |  | 7 | 20 | 7 |
With a specific allowance recorded, Recorded Investment | 193 |  | 338 | 193 | 338 |
With a specific allowance recorded, Unpaid Principal Balance | 193 |  | 345 | 193 | 345 |
With a specific allowance recorded, Related Allowance | 188 |  | 203 | 188 | 203 |
With a specific allowance recorded, Average Recorded Investment | 319 |  | 341 | 327 | 564 |
Recorded Investment | 771 |  | 812 | 771 | 812 |
Unpaid Principal Balance | 771 |  | 819 | 771 | 819 |
Related Allowance | 188 |  | 203 | 188 | 203 |
Average Recorded Investment | 781 |  | 817 | 747 | 843 |
Interest Income Recognized | $ 7 |  | $ 7 | $ 20 | $ 7 |

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