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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, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 1,914 | $ 1,808 | $ 1,841 | $ 1,914 | $ 1,841 | $ 1,808
With a specific allowance recorded, Recorded Investment | 1,314 | 246 | 970 | 1,314 | 970 | 246
Related Allowance | 187 | 31 | 148 | 187 | 148 | 31
Recorded Investment | 3,228 | 2,054 | 2,811 | 3,228 | 2,811 | 2,054
Average Recorded Investment | 3,141 | $ 2,533 | 2,158 | 2,492 | 1,765 | $ 1,958
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 626 |  | 589 | 626 | 589 |
With no related allowance recorded, Unpaid Principal Balance | 626 |  | 589 | 626 | 589 |
With no related allowance recorded, Average Recorded Investment | 628 |  | 645 | 625 | 554 |
With no related allowance recorded, Interest Income Recognized | 9 |  | 9 | 24 | 23 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  | 5 | 7 | 15 |
With a specific allowance recorded, Recorded Investment | 126 |  | 174 | 126 | 174 |
With a specific allowance recorded, Unpaid Principal Balance | 128 |  | 174 | 128 | 174 |
Related Allowance | 22 |  | 26 | 22 | 26 |
With a specific allowance recorded, Average Recorded Investment | 172 |  | 227 | 220 | 153 |
Recorded Investment | 752 |  | 763 | 752 | 763 |
Unpaid Principal Balance | 754 |  | 763 | 754 | 763 |
Average Recorded Investment | 800 |  | 872 | 845 | 707 |
Interest Income Recognized | 9 |  | 9 | 24 | 23 |
Interest Income Recognized Cash Basis | 3 |  | 5 | 7 | 15 |
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 406 |  |  | 406 |  |
With no related allowance recorded, Unpaid Principal Balance | 406 |  |  | 406 |  |
With no related allowance recorded, Average Recorded Investment | 406 |  |  | 135 | 22 |
Recorded Investment | 406 |  |  | 406 |  |
Unpaid Principal Balance | 406 |  |  | 406 |  |
Average Recorded Investment | 406 |  |  | 135 | 22 |
Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 368 |  |  | 368 |  |
With no related allowance recorded, Unpaid Principal Balance | 368 |  |  | 368 |  |
With no related allowance recorded, Average Recorded Investment | 368 |  |  | 123 |  |
With a specific allowance recorded, Average Recorded Investment |  |  |  | 24 |  |
Recorded Investment | 368 |  |  | 368 |  |
Unpaid Principal Balance | 368 |  |  | 368 |  |
Average Recorded Investment | 368 |  |  | 147 |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 304 |  | 196 | 304 | 196 |
With no related allowance recorded, Unpaid Principal Balance | 304 |  | 196 | 304 | 196 |
With no related allowance recorded, Average Recorded Investment | 267 |  | 197 | 217 | 199 |
With no related allowance recorded, Interest Income Recognized | 7 |  | 3 | 14 | 8 |
With a specific allowance recorded, Average Recorded Investment |  |  |  |  | 186 |
With a specific allowance recorded, Interest Income Recognized | 14 |  |  |  |  |
Recorded Investment | 304 |  | 196 | 304 | 196 |
Unpaid Principal Balance | 304 |  | 196 | 304 | 196 |
Average Recorded Investment | 267 |  | 197 | 217 | 385 |
Interest Income Recognized | 21 |  | 3 | 14 | 8 |
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 210 |  | 1,056 | 210 | 1,056 |
With no related allowance recorded, Unpaid Principal Balance | 210 |  | 1,056 | 210 | 1,056 |
With no related allowance recorded, Average Recorded Investment | 219 |  | 504 | 697 | 238 |
With no related allowance recorded, Interest Income Recognized | 3 |  | 12 | 9 | 12 |
With a specific allowance recorded, Recorded Investment | 1,188 |  | 796 | 1,188 | 796 |
With a specific allowance recorded, Unpaid Principal Balance | 1,188 |  | 796 | 1,188 | 796 |
Related Allowance | 165 |  | 122 | 165 | 122 |
With a specific allowance recorded, Average Recorded Investment | 1,081 |  | 585 | 451 | 413 |
With a specific allowance recorded, Interest Income Recognized |  |  | 3 | 37 | 11 |
Recorded Investment | 1,398 |  | 1,852 | 1,398 | 1,852 |
Unpaid Principal Balance | 1,398 |  | 1,852 | 1,398 | 1,852 |
Average Recorded Investment | 1,300 |  | 1,089 | 1,148 | 651 |
Interest Income Recognized | $ 3 |  | $ 15 | $ 46 | $ 23 |

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