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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, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 2,695 | $ 2,420 | $ 1,071 | $ 2,695 | $ 1,071 | $ 2,420
With a specific allowance recorded, Recorded Investment | 9,872 | 641 | 1,105 | 9,872 | 1,105 | 641
Related Allowance | 1,170 | 197 | 235 | 1,170 | 235 | 197
Recorded Investment | 12,567 | 3,061 | 2,176 | 12,567 | 2,176 | 3,061
Average Recorded Investment | 8,352 | 3,120 | 2,201 | 6,333 | 2,168 | 2,649
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 787 | 648 | 643 | 787 | 643 | 648
With no related allowance recorded, Unpaid Principal Balance | 787 | 648 | 643 | 787 | 643 | 648
With no related allowance recorded, Average Recorded Investment | 624 |  | 644 | 637 | 624 | 626
With no related allowance recorded, Interest Income Recognized | 4 |  | 8 | 8 | 15 | 32
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 3 | 3 | 4 | 9
With a specific allowance recorded, Recorded Investment | 60 | 181 | 219 | 60 | 219 | 181
With a specific allowance recorded, Unpaid Principal Balance | 60 | 184 | 219 | 60 | 219 | 184
Related Allowance | 16 | 30 | 54 | 16 | 54 | 30
With a specific allowance recorded, Average Recorded Investment | 194 |  | 235 | 203 | 244 | 211
With a specific allowance recorded, Interest Income Recognized | 1 |  |  | 3 |  |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 1 |  |  | 1 |  |
Recorded Investment | 847 | 829 | 862 | 847 | 862 | 829
Unpaid Principal Balance | 847 | 832 | 862 | 847 | 862 | 832
Average Recorded Investment | 818 |  | 879 | 840 | 868 | 837
Interest Income Recognized | 5 |  | 8 | 11 | 15 | 32
Interest Income Recognized Cash Basis | 1 |  | 3 | 4 | 4 | 9
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 521 |  |  | 521 |  |
With no related allowance recorded, Unpaid Principal Balance | 521 |  |  | 521 |  |
With no related allowance recorded, Average Recorded Investment | 187 |  |  | 239 |  | 204
With no related allowance recorded, Interest Income Recognized | 5 |  |  | 7 |  |
With a specific allowance recorded, Recorded Investment | 5,469 |  |  | 5,469 |  |
With a specific allowance recorded, Unpaid Principal Balance | 5,469 |  |  | 5,469 |  |
Related Allowance | 438 |  |  | 438 |  |
With a specific allowance recorded, Average Recorded Investment | 1,884 |  |  | 988 |  | 22
With a specific allowance recorded, Interest Income Recognized | 1 |  |  | 3 |  | 1
Recorded Investment | 5,990 |  |  | 5,990 |  |
Unpaid Principal Balance | 5,990 |  |  | 5,990 |  |
Average Recorded Investment | 2,071 |  |  | 1,227 |  | 226
Interest Income Recognized | 6 |  |  | 10 |  | 1
Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 383 | 491 |  | 383 |  | 491
With no related allowance recorded, Unpaid Principal Balance | 383 | 491 |  | 383 |  | 491
With no related allowance recorded, Average Recorded Investment | 340 |  |  | 363 |  | 124
With no related allowance recorded, Interest Income Recognized | 4 |  |  | 8 |  |
With a specific allowance recorded, Recorded Investment | 240 | 200 | 74 | 240 | 74 | 200
With a specific allowance recorded, Unpaid Principal Balance | 240 | 200 | 74 | 240 | 74 | 200
Related Allowance | 98 | 21 | 26 | 98 | 26 | 21
With a specific allowance recorded, Average Recorded Investment | 161 |  | 74 | 141 | 37 | 29
With a specific allowance recorded, Interest Income Recognized | 9 |  |  |  |  |
Recorded Investment | 623 | 691 | 74 | 623 | 74 | 691
Unpaid Principal Balance | 623 | 691 | 74 | 623 | 74 | 691
Average Recorded Investment | 501 |  | 74 | 504 | 37 | 153
Interest Income Recognized | 13 |  |  | 8 |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 186 | 299 | 191 | 186 | 191 | 299
With no related allowance recorded, Unpaid Principal Balance | 186 | 299 | 191 | 186 | 191 | 299
With no related allowance recorded, Average Recorded Investment | 186 |  | 191 | 205 | 192 | 238
With no related allowance recorded, Interest Income Recognized |  |  | 3 | 4 | 7 | 19
With a specific allowance recorded, Recorded Investment | 3,072 |  |  | 3,072 |  |
With a specific allowance recorded, Unpaid Principal Balance | 3,072 |  |  | 3,072 |  |
Related Allowance | 58 |  |  | 58 |  |
With a specific allowance recorded, Average Recorded Investment | 3,085 |  |  | 2,061 |  |
With a specific allowance recorded, Interest Income Recognized | 39 |  |  | 78 |  |
Recorded Investment | 3,258 | 299 | 191 | 3,258 | 191 | 299
Unpaid Principal Balance | 3,258 | 299 | 191 | 3,258 | 191 | 299
Average Recorded Investment | 3,271 |  | 191 | 2,266 | 192 | 238
Interest Income Recognized | 39 |  | 3 | 82 | 7 | 19
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 791 | 982 | 237 | 791 | 237 | 982
With no related allowance recorded, Unpaid Principal Balance | 791 | 982 | 237 | 791 | 237 | 982
With no related allowance recorded, Average Recorded Investment | 568 |  | 787 | 633 | 936 | 637
With no related allowance recorded, Interest Income Recognized | 4 |  | 3 | 6 | 6 | 66
With a specific allowance recorded, Recorded Investment | 1,031 | 227 | 812 | 1,031 | 812 | 227
With a specific allowance recorded, Unpaid Principal Balance | 1,031 | 377 | 812 | 1,031 | 812 | 377
Related Allowance | 560 | 142 | 155 | 560 | 155 | 142
With a specific allowance recorded, Average Recorded Investment | 1,095 |  | 270 | 834 | 135 | 555
With a specific allowance recorded, Interest Income Recognized | 11 |  | 12 | 27 | 23 |
Recorded Investment | 1,822 | 1,209 | 1,049 | 1,822 | 1,049 | 1,209
Unpaid Principal Balance | 1,822 | 1,359 | 1,049 | 1,822 | 1,049 | 1,359
Average Recorded Investment | 1,663 |  | 1,057 | 1,467 | 1,071 | 1,192
Interest Income Recognized | 15 |  | $ 15 | 33 | $ 29 | 66
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 27 |  |  | 27 |  |
With no related allowance recorded, Unpaid Principal Balance | 27 |  |  | 27 |  |
With no related allowance recorded, Average Recorded Investment | 28 |  |  | 19 |  |
With no related allowance recorded, Interest Income Recognized |  |  |  | 1 |  |
With a specific allowance recorded, Recorded Investment |  | 33 |  |  |  | 33
With a specific allowance recorded, Unpaid Principal Balance |  | 33 |  |  |  | 33
Related Allowance |  | 4 |  |  |  | 4
With a specific allowance recorded, Average Recorded Investment |  |  |  | 10 |  | 3
Recorded Investment | 27 | 33 |  | 27 |  | 33
Unpaid Principal Balance | 27 | $ 33 |  | 27 |  | 33
Average Recorded Investment | $ 28 |  |  | 29 |  | $ 3
Interest Income Recognized |  |  |  | $ 1 |  |

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