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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | $ 1,808 | $ 1,131 |
With a specific allowance recorded, Recorded Investment | 246 | 614 |
Related Allowance | 31 | 106 |
Recorded Investment | 2,054 | 1,745 |
Average Recorded Investment | 1,958 | 1,885 | $ 1,802
Interest Income Recognized | 69 | 57 | 64
Interest Income Recognized Cash Basis | 17 | 23 | $ 27
Consumer Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 583 | 495 |
With no related allowance recorded, Unpaid Principal Balance | 583 | 495 |
With no related allowance recorded, Average Recorded Investment | 562 | 911 |
With no related allowance recorded, Interest Income Recognized | 31 | 30 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 17 | 21 |
With a specific allowance recorded, Recorded Investment | 174 | 80 |
With a specific allowance recorded, Unpaid Principal Balance | 174 | 80 |
Related Allowance | 26 | 21 |
With a specific allowance recorded, Average Recorded Investment | 158 | 88 |
Recorded Investment | 757 | 575 |
Unpaid Principal Balance | 757 | 575 |
Average Recorded Investment | 720 | 999 |
Interest Income Recognized | 31 | 30 |
Interest Income Recognized Cash Basis | 17 | 21 |
Agricultural Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment |  | 101 |
With no related allowance recorded, Unpaid Principal Balance |  | 101 |
With no related allowance recorded, Average Recorded Investment | 17 | 123 |
Recorded Investment |  | 101 |
Unpaid Principal Balance |  | 101 |
Average Recorded Investment | 17 | 123 |
Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Average Recorded Investment |  | 27 |
Average Recorded Investment |  | 27 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 194 | 202 |
With no related allowance recorded, Unpaid Principal Balance | 194 | 202 |
With no related allowance recorded, Average Recorded Investment | 198 | 51 |
With no related allowance recorded, Interest Income Recognized | 11 | 1 |
With a specific allowance recorded, Recorded Investment |  | 423 |
With a specific allowance recorded, Unpaid Principal Balance |  | 423 |
Related Allowance |  | 46 |
With a specific allowance recorded, Average Recorded Investment | 140 | 486 |
With a specific allowance recorded, Interest Income Recognized |  | 24 |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  | 2 |
Recorded Investment | 194 | 625 |
Unpaid Principal Balance | 194 | 625 |
Average Recorded Investment | 338 | 537 |
Interest Income Recognized | 11 | 25 |
Interest Income Recognized Cash Basis |  | 2 |
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
With no related allowance recorded, Recorded Investment | 1,031 | 333 |
With no related allowance recorded, Unpaid Principal Balance | 1,031 | 333 |
With no related allowance recorded, Average Recorded Investment | 438 | 85 |
With no related allowance recorded, Interest Income Recognized | 25 | 2 |
With a specific allowance recorded, Recorded Investment | 72 | 111 |
With a specific allowance recorded, Unpaid Principal Balance | 72 | 111 |
Related Allowance | 5 | 39 |
With a specific allowance recorded, Average Recorded Investment | 445 | 114 |
With a specific allowance recorded, Interest Income Recognized | 2 |  |
Recorded Investment | 1,103 | 444 |
Unpaid Principal Balance | 1,103 | 444 |
Average Recorded Investment | 883 | 199 |
Interest Income Recognized | $ 27 | $ 2 |

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