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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 1,071 | $ 1,808 | $ 804 | $ 1,071 | $ 804 | $ 1,808
With a specific allowance recorded, Recorded Investment | 1,105 | 246 | 648 | 1,105 | 648 | 246
Related Allowance | 235 | 31 | 132 | 235 | 132 | 31
Recorded Investment | 2,176 | 2,054 | 1,452 | 2,176 | 1,452 | 2,054
Average Recorded Investment | 2,201 | $ 2,533 | 1,452 | 2,168 | 1,570 | $ 1,958
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 643 |  | 606 | 643 | 606 |
With no related allowance recorded, Unpaid Principal Balance | 643 |  | 606 | 643 | 606 |
With no related allowance recorded, Average Recorded Investment | 644 |  | 526 | 624 | 509 |
With no related allowance recorded, Interest Income Recognized | 8 |  | 6 | 15 | 14 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  | 4 | 4 | 10 |
With a specific allowance recorded, Recorded Investment | 219 |  | 254 | 219 | 254 |
With a specific allowance recorded, Unpaid Principal Balance | 219 |  | 254 | 219 | 254 |
Related Allowance | 54 |  | 46 | 54 | 46 |
With a specific allowance recorded, Average Recorded Investment | 235 |  | 152 | 244 | 116 |
Recorded Investment | 862 |  | 860 | 862 | 860 |
Unpaid Principal Balance | 862 |  | 860 | 862 | 860 |
Average Recorded Investment | 879 |  | 678 | 868 | 625 |
Interest Income Recognized | 8 |  | 6 | 15 | 14 |
Interest Income Recognized Cash Basis | 3 |  | 4 | 4 | 10 |
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Average Recorded Investment |  |  |  |  | 34 |
Average Recorded Investment |  |  |  |  | 34 |
Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With a specific allowance recorded, Recorded Investment | 74 |  |  | 74 |  |
With a specific allowance recorded, Unpaid Principal Balance | 74 |  |  | 74 |  |
Related Allowance | 26 |  |  | 26 |  |
With a specific allowance recorded, Average Recorded Investment | 74 |  |  | 37 |  |
Recorded Investment | 74 |  |  | 74 |  |
Unpaid Principal Balance | 74 |  |  | 74 |  |
Average Recorded Investment | 74 |  |  | 37 |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 191 |  | 198 | 191 | 198 |
With no related allowance recorded, Unpaid Principal Balance | 191 |  | 198 | 191 | 198 |
With no related allowance recorded, Average Recorded Investment | 191 |  | 199 | 192 | 200 |
With no related allowance recorded, Interest Income Recognized | 3 |  | 3 | 7 | 5 |
With a specific allowance recorded, Average Recorded Investment |  |  | 139 |  | 279 |
Recorded Investment | 191 |  | 198 | 191 | 198 |
Unpaid Principal Balance | 191 |  | 198 | 191 | 198 |
Average Recorded Investment | 191 |  | 338 | 192 | 479 |
Interest Income Recognized | 3 |  | 3 | 7 | 5 |
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 237 |  |  | 237 |  |
With no related allowance recorded, Unpaid Principal Balance | 237 |  |  | 237 |  |
With no related allowance recorded, Average Recorded Investment | 787 |  |  | 936 | 104 |
With no related allowance recorded, Interest Income Recognized | 3 |  |  | 6 |  |
With a specific allowance recorded, Recorded Investment | 812 |  | 394 | 812 | 394 |
With a specific allowance recorded, Unpaid Principal Balance | 812 |  | 394 | 812 | 394 |
Related Allowance | 155 |  | 86 | 155 | 86 |
With a specific allowance recorded, Average Recorded Investment | 270 |  | 436 | 135 | 328 |
With a specific allowance recorded, Interest Income Recognized | 12 |  | 4 | 23 | 8 |
Recorded Investment | 1,049 |  | 394 | 1,049 | 394 |
Unpaid Principal Balance | 1,049 |  | 394 | 1,049 | 394 |
Average Recorded Investment | 1,057 |  | 436 | 1,071 | 432 |
Interest Income Recognized | $ 15 |  | $ 4 | $ 29 | $ 8 |

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