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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, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 5,134 | $ 2,420 | $ 1,914 | $ 5,134 | $ 1,914 | $ 2,420
With a specific allowance recorded, Recorded Investment | 10,125 | 641 | 1,314 | 10,125 | 1,314 | 641
Related Allowance | 1,198 | 197 | 187 | 1,198 | 187 | 197
Recorded Investment | 15,259 | 3,061 | 3,228 | 15,259 | 3,228 | 3,061
Average Recorded Investment | 13,517 | 3,120 | 3,141 | 8,613 | 2,492 | 2,649
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 780 | 648 | 626 | 780 | 626 | 648
With no related allowance recorded, Unpaid Principal Balance | 780 | 648 | 626 | 780 | 626 | 648
With no related allowance recorded, Average Recorded Investment | 791 |  | 628 | 688 | 625 | 626
With no related allowance recorded, Interest Income Recognized | 41 |  | 9 | 120 | 24 | 32
With no related allowance recorded, Interest Income Recognized Cash Basis | 5 |  | 3 | 9 | 7 | 9
With a specific allowance recorded, Recorded Investment | 205 | 181 | 126 | 205 | 126 | 181
With a specific allowance recorded, Unpaid Principal Balance | 205 | 184 | 128 | 205 | 128 | 184
Related Allowance | 43 | 30 | 22 | 43 | 22 | 30
With a specific allowance recorded, Average Recorded Investment | 119 |  | 172 | 60 | 220 | 211
With a specific allowance recorded, Interest Income Recognized | 8 |  |  | 10 |  |
Recorded Investment | 985 | 829 | 752 | 985 | 752 | 829
Unpaid Principal Balance | 985 | 832 | 754 | 985 | 754 | 832
Average Recorded Investment | 910 |  | 800 | 748 | 845 | 837
Interest Income Recognized | 49 |  | 9 | 130 | 24 | 32
Interest Income Recognized Cash Basis | 5 |  | 3 | 9 | 7 | 9
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 1,589 |  | 406 | 1,589 | 406 |
With no related allowance recorded, Unpaid Principal Balance | 1,589 |  | 406 | 1,589 | 406 |
With no related allowance recorded, Average Recorded Investment | 873 |  | 406 | 451 | 135 | 204
With no related allowance recorded, Interest Income Recognized | 2 |  |  | 6 |  |
With a specific allowance recorded, Recorded Investment | 5,425 |  |  | 5,425 |  |
With a specific allowance recorded, Unpaid Principal Balance | 5,425 |  |  | 5,425 |  |
Related Allowance | 432 |  |  | 432 |  |
With a specific allowance recorded, Average Recorded Investment | 5,450 |  |  | 2,475 |  | 22
With a specific allowance recorded, Interest Income Recognized | 2 |  |  | 7 |  | 1
Recorded Investment | 7,014 |  | 406 | 7,014 | 406 |
Unpaid Principal Balance | 7,014 |  | 406 | 7,014 | 406 |
Average Recorded Investment | 6,323 |  | 406 | 2,926 | 135 | 226
Interest Income Recognized | 4 |  |  | 13 |  | 1
Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 533 | 491 | 368 | 533 | 368 | 491
With no related allowance recorded, Unpaid Principal Balance | 533 | 491 | 368 | 533 | 368 | 491
With no related allowance recorded, Average Recorded Investment | 375 |  | 368 | 367 | 123 | 124
With no related allowance recorded, Interest Income Recognized | 4 |  |  | 9 |  |
With no related allowance recorded, Interest Income Recognized Cash Basis | 1 |  |  | 1 |  |
With a specific allowance recorded, Recorded Investment | 188 | 200 |  | 188 |  | 200
With a specific allowance recorded, Unpaid Principal Balance | 188 | 200 |  | 188 |  | 200
Related Allowance | 28 | 21 |  | 28 |  | 21
With a specific allowance recorded, Average Recorded Investment | 342 |  |  | 208 | 24 | 29
With a specific allowance recorded, Interest Income Recognized | 3 |  |  | 6 |  |
Recorded Investment | 721 | 691 | 368 | 721 | 368 | 691
Unpaid Principal Balance | 721 | 691 | 368 | 721 | 368 | 691
Average Recorded Investment | 717 |  | 368 | 575 | 147 | 153
Interest Income Recognized | 7 |  |  | 15 |  |
Interest Income Recognized Cash Basis | 1 |  |  | 1 |  |
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 186 | 299 | 304 | 186 | 304 | 299
With no related allowance recorded, Unpaid Principal Balance | 186 | 299 | 304 | 186 | 304 | 299
With no related allowance recorded, Average Recorded Investment | 186 |  | 267 | 199 | 217 | 238
With no related allowance recorded, Interest Income Recognized | 1 |  | 7 | 3 | 14 | 19
With a specific allowance recorded, Recorded Investment | 3,033 |  |  | 3,033 |  |
With a specific allowance recorded, Unpaid Principal Balance | 3,033 |  |  | 3,033 |  |
Related Allowance | 44 |  |  | 44 |  |
With a specific allowance recorded, Average Recorded Investment | 3,046 |  |  | 2,389 |  |
With a specific allowance recorded, Interest Income Recognized |  |  | 14 |  |  |
Recorded Investment | 3,219 | 299 | 304 | 3,219 | 304 | 299
Unpaid Principal Balance | 3,219 | 299 | 304 | 3,219 | 304 | 299
Average Recorded Investment | 3,232 |  | 267 | 2,588 | 217 | 238
Interest Income Recognized | 1 |  | 21 | 3 | 14 | 19
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 2,021 | 982 | 210 | 2,021 | 210 | 982
With no related allowance recorded, Unpaid Principal Balance | 2,021 | 982 | 210 | 2,021 | 210 | 982
With no related allowance recorded, Average Recorded Investment | 1,190 |  | 219 | 819 | 697 | 637
With no related allowance recorded, Interest Income Recognized | 5 |  | 3 | 18 | 9 | 66
With a specific allowance recorded, Recorded Investment | 1,274 | 227 | 1,188 | 1,274 | 1,188 | 227
With a specific allowance recorded, Unpaid Principal Balance | 1,274 | 377 | 1,188 | 1,274 | 1,188 | 377
Related Allowance | 651 | 142 | 165 | 651 | 165 | 142
With a specific allowance recorded, Average Recorded Investment | 1,119 |  | 1,081 | 929 | 451 | 555
With a specific allowance recorded, Interest Income Recognized | 3 |  |  | 10 | 37 |
Recorded Investment | 3,295 | 1,209 | 1,398 | 3,295 | 1,398 | 1,209
Unpaid Principal Balance | 3,295 | 1,359 | 1,398 | 3,295 | 1,398 | 1,359
Average Recorded Investment | 2,309 |  | 1,300 | 1,748 | 1,148 | 1,192
Interest Income Recognized | 8 |  | $ 3 | 28 | $ 46 | 66
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 25 |  |  | 25 |  |
With no related allowance recorded, Unpaid Principal Balance | 25 |  |  | 25 |  |
With no related allowance recorded, Average Recorded Investment | 26 |  |  | 21 |  |
With no related allowance recorded, Interest Income Recognized | 21 |  |  | 37 |  |
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 |  |  |  | 7 |  | 3
Recorded Investment | 25 | 33 |  | 25 |  | 33
Unpaid Principal Balance | 25 | $ 33 |  | 25 |  | 33
Average Recorded Investment | 26 |  |  | 28 |  | $ 3
Interest Income Recognized | $ 21 |  |  | $ 37 |  |

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