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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | $ 1,257 | $ 675 |
With no related allowance recorded, Related Allowance | 330 | 387 |
With a specific allowance recorded, Recorded Investment | 879 | 1,168 |
With a specific allowance recorded, Related Allowance | 330 | 387 |
Recorded Investment | 2,136 | 1,843 |
Related Allowance | 330 | 387 |
Average Recorded Investment | 2,509 | 1,929 | $ 3,274
Interest Income Recognized | 96 | 87 | 60
Interest Income Recognized on a Cash Basis | 60 | 51 | $ 17
Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 63 |  |
With no related allowance recorded, Unpaid Principal Balance | 63 |  |
With no related allowance recorded, Average Recorded Investment | 120 | 93 |
With no related allowance recorded, Interest Income Recognized |  | 7 |
With a specific allowance recorded, Average Recorded Investment |  | 15 |
Recorded Investment | 63 |  |
Unpaid Principal Balance | 63 |  |
Average Recorded Investment | 120 | 108 |
Interest Income Recognized |  | 7 |
Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Related Allowance |  | 25 |
With a specific allowance recorded, Recorded Investment |  | 25 |
With a specific allowance recorded, Unpaid Principal Balance |  | 25 |
With a specific allowance recorded, Related Allowance |  | 25 |
With a specific allowance recorded, Average Recorded Investment |  | 2 |
Recorded Investment |  | 25 |
Unpaid Principal Balance |  | 25 |
Related Allowance |  | 25 |
Average Recorded Investment |  | 2 |
Consumer Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 156 | 204 |
With no related allowance recorded, Unpaid Principal Balance | 156 | 229 |
With no related allowance recorded, Related Allowance | 64 | 36 |
With no related allowance recorded, Average Recorded Investment | 158 | 52 |
With no related allowance recorded, Interest Income Recognized | 5 | 1 |
With no related allowance recorded, Interest Income Recognized on a Cash Basis | 5 | 1 |
With a specific allowance recorded, Recorded Investment | 275 | 97 |
With a specific allowance recorded, Unpaid Principal Balance | 323 | 97 |
With a specific allowance recorded, Related Allowance | 64 | 36 |
With a specific allowance recorded, Average Recorded Investment | 181 | 118 |
With a specific allowance recorded, Interest Income Recognized | 7 | 6 |
With a specific allowance recorded, Interest Income Recognized on a Cash Basis | 6 | 6 |
Recorded Investment | 431 | 301 |
Unpaid Principal Balance | 479 | 326 |
Related Allowance | 64 | 36 |
Average Recorded Investment | 339 | 170 |
Interest Income Recognized | 12 | 7 |
Interest Income Recognized on a Cash Basis | 11 | 7 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 1,038 | 471 |
With no related allowance recorded, Unpaid Principal Balance | 1,038 | 471 |
With no related allowance recorded, Related Allowance | 152 | 111 |
With no related allowance recorded, Average Recorded Investment | 421 | 740 |
With no related allowance recorded, Interest Income Recognized | 27 | 7 |
With no related allowance recorded, Interest Income Recognized on a Cash Basis | 27 | 5 |
With a specific allowance recorded, Recorded Investment | 422 | 709 |
With a specific allowance recorded, Unpaid Principal Balance | 422 | 709 |
With a specific allowance recorded, Related Allowance | 152 | 111 |
With a specific allowance recorded, Average Recorded Investment | 907 | 83 |
With a specific allowance recorded, Interest Income Recognized | 30 | 21 |
With a specific allowance recorded, Interest Income Recognized on a Cash Basis | 22 | 21 |
Recorded Investment | 1,460 | 1,180 |
Unpaid Principal Balance | 1,460 | 1,180 |
Related Allowance | 152 | 111 |
Average Recorded Investment | 1,328 | 823 |
Interest Income Recognized | 57 | 28 |
Interest Income Recognized on a Cash Basis | 49 | 26 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Related Allowance |  | 11 |
With a specific allowance recorded, Recorded Investment |  | 11 |
With a specific allowance recorded, Unpaid Principal Balance |  | 11 |
With a specific allowance recorded, Related Allowance |  | 11 |
With a specific allowance recorded, Average Recorded Investment | 2 | 1 |
Recorded Investment |  | 11 |
Unpaid Principal Balance |  | 11 |
Related Allowance |  | 11 |
Average Recorded Investment | 2 | 1 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Related Allowance | 114 | 204 |
With no related allowance recorded, Average Recorded Investment | 429 | 319 |
With no related allowance recorded, Interest Income Recognized | 27 | 45 |
With no related allowance recorded, Interest Income Recognized on a Cash Basis |  | 18 |
With a specific allowance recorded, Recorded Investment | 182 | 326 |
With a specific allowance recorded, Unpaid Principal Balance | 182 | 326 |
With a specific allowance recorded, Related Allowance | 114 | 204 |
With a specific allowance recorded, Average Recorded Investment | 291 | 506 |
Recorded Investment | 182 | 326 |
Unpaid Principal Balance | 182 | 326 |
Related Allowance | 114 | 204 |
Average Recorded Investment | 720 | 825 |
Interest Income Recognized | $ 27 | 45 |
Interest Income Recognized on a Cash Basis |  | $ 18 |

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