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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, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | $ 1,042 | $ 1,257 | $ 624 | $ 1,257
With a specific allowance recorded, Related Allowance | 426 | 330 | 428 | 330
With a specific allowance recorded, Recorded Investment | 1,169 | 879 | 1,619 | 879
Related Allowance | 426 | 330 | 428 | 330
Recorded Investment | 2,211 | 2,136 | 2,243 | 2,136
Related Allowance | 426 | 330 | 428 | 330
Average Recorded Investment | 2,130 | $ 2,207 | 1,958 | $ 2,509
Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 162 |  | 157 |
With no related allowance recorded, Unpaid Principal Balance | 162 |  | 157 |
With a specific allowance recorded, Related Allowance | 57 |  |  |
With no related allowance recorded, Average Recorded Investment | 162 |  | 173 |
With a specific allowance recorded, Recorded Investment | 57 |  |  |
With a specific allowance recorded, Unpaid Principal Balance | 57 |  |  |
Related Allowance | 57 |  |  |
With a specific allowance recorded, Average Recorded Investment | 38 |  |  |
With a specific allowance recorded, Interest Income Recognized | 1 |  |  |
Recorded Investment | 219 |  |  |
Unpaid Principal Balance | 219 |  |  |
Related Allowance | 57 |  |  |
Average Recorded Investment | 200 |  |  |
Interest Income Recognized | 1 |  |  |
Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With a specific allowance recorded, Related Allowance |  |  | 24 |
With a specific allowance recorded, Recorded Investment |  |  | 24 |
With a specific allowance recorded, Unpaid Principal Balance |  |  | 24 |
Related Allowance |  |  | 24 |
With a specific allowance recorded, Average Recorded Investment |  |  | 24 |
Recorded Investment |  |  | 24 |
Unpaid Principal Balance |  |  | 24 |
Related Allowance |  |  | 24 |
Average Recorded Investment |  |  | 24 |
Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 365 |  |  |
With no related allowance recorded, Unpaid Principal Balance | 365 |  |  |
With a specific allowance recorded, Related Allowance | 104 |  | 35 |
With no related allowance recorded, Average Recorded Investment | 156 |  |  |
With no related allowance recorded, Interest Income Recognized | 3 |  |  |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  |  |
With a specific allowance recorded, Recorded Investment | 509 |  | 96 |
With a specific allowance recorded, Unpaid Principal Balance | 628 |  | 96 |
Related Allowance | 104 |  | 35 |
With a specific allowance recorded, Average Recorded Investment | 307 |  | 96 |
With a specific allowance recorded, Interest Income Recognized | 1 |  | 3 |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  | 3 |
Recorded Investment | 874 |  | 253 |
Unpaid Principal Balance | 993 |  | 253 |
Related Allowance | 104 |  | 35 |
Average Recorded Investment | 463 |  | 269 |
Interest Income Recognized | 4 |  | 3 |
Interest Income Recognized Cash Basis | 3 |  | 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 a specific allowance recorded, Related Allowance | 152 |  | 131 |
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 | 422 |  | 1,139 |
With a specific allowance recorded, Unpaid Principal Balance | 422 |  | 1,139 |
Related Allowance | 152 |  | 131 |
With a specific allowance recorded, Average Recorded Investment | 422 |  | 852 |
Recorded Investment | 937 |  | 1,139 |
Unpaid Principal Balance | 937 |  | 1,139 |
Related Allowance | 152 |  | 131 |
Average Recorded Investment | 831 |  | 852 |
Interest Income Recognized | 8 |  |  |
Interest Income Recognized Cash Basis | 7 |  |  |
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment |  |  | 467 |
With no related allowance recorded, Unpaid Principal Balance |  |  | 467 |
With no related allowance recorded, Average Recorded Investment |  |  | 469 |
With no related allowance recorded, Interest Income Recognized |  |  | 7 |
With a specific allowance recorded, Average Recorded Investment |  |  | 7 |
Average Recorded Investment |  |  | 7 |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With a specific allowance recorded, Related Allowance | 113 |  | 238 |
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 | 181 |  | 360 |
With a specific allowance recorded, Unpaid Principal Balance | 239 |  | 360 |
Related Allowance | 113 |  | 238 |
With a specific allowance recorded, Average Recorded Investment | 182 |  | 337 |
Recorded Investment | 181 |  | 827 |
Unpaid Principal Balance | 239 |  | 827 |
Related Allowance | 113 |  | 238 |
Average Recorded Investment | 636 |  | 806 |
Interest Income Recognized | $ 6 |  | $ 7 |

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