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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, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 5,835 | $ 1,228 | $ 2,461 | $ 5,835 | $ 2,461 | $ 1,228
With a specific allowance recorded, Recorded Investment | 4,918 | 10,711 | 9,388 | 4,918 | 9,388 | 10,711
Related Allowance | 2,436 | 2,184 | 2,400 | 2,436 | 2,400 | 2,184
Recorded Investment | 10,753 | 11,939 | 11,849 | 10,753 | 11,849 | 11,939
Average Recorded Investment | 10,662 | 11,676 | 11,639 | 11,059 | 12,360 | 12,247
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 624 | 604 | 714 | 624 | 714 | 604
With no related allowance recorded, Unpaid Principal Balance | 624 | 604 | 714 | 624 | 714 | 604
With no related allowance recorded, Average Recorded Investment | 352 |  | 453 | 372 | 485 | 456
With no related allowance recorded, Interest Income Recognized | 1 |  | 1 | 3 | 4 | 5
With no related allowance recorded, Interest Income Recognized Cash Basis | 5 |  | 3 | 10 | 10 | 15
With a specific allowance recorded, Average Recorded Investment |  |  |  |  |  | 59
Recorded Investment | 624 | 604 | 714 | 624 | 714 | 604
Unpaid Principal Balance | 624 | 604 | 714 | 624 | 714 | 604
Average Recorded Investment | 352 |  | 453 | 372 | 485 | 515
Interest Income Recognized | 1 |  | 1 | 3 | 4 | 5
Interest Income Recognized Cash Basis | 5 |  | 3 | 10 | 10 | 15
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 2,588 | 423 | 1,207 | 2,588 | 1,207 | 423
With no related allowance recorded, Unpaid Principal Balance | 2,693 | 423 | 1,207 | 2,693 | 1,207 | 423
With no related allowance recorded, Average Recorded Investment | 2,467 |  | 1,047 | 1,953 | 1,191 | 1,000
With no related allowance recorded, Interest Income Recognized | 6 |  | 19 | 19 | 53 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 1 |  |  | 6 |  |
With a specific allowance recorded, Recorded Investment |  | 6,302 | 4,844 |  | 4,844 | 6,302
With a specific allowance recorded, Unpaid Principal Balance |  | 6,406 | 4,844 |  | 4,844 | 6,406
Related Allowance |  | 691 | 636 |  | 636 | 691
With a specific allowance recorded, Average Recorded Investment |  |  | 5,104 | 1,850 | 5,273 | 5,414
With a specific allowance recorded, Interest Income Recognized |  |  | 4 |  | 15 | 54
Recorded Investment | 2,588 | 6,725 | 6,051 | 2,588 | 6,051 | 6,725
Unpaid Principal Balance | 2,693 | 6,829 | 6,051 | 2,693 | 6,051 | 6,829
Average Recorded Investment | 2,467 |  | 6,151 | 3,803 | 6,464 | 6,414
Interest Income Recognized | 6 |  | 23 | 19 | 68 | 87
Interest Income Recognized Cash Basis | 1 |  |  | 6 |  |
With no related allowance recorded, Adjusted Interest Income Recognized |  |  |  |  |  | 33
Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 1,334 |  | 130 | 1,334 | 130 |
With no related allowance recorded, Unpaid Principal Balance | 1,334 |  | 130 | 1,334 | 130 |
With no related allowance recorded, Average Recorded Investment | 1,309 |  | 130 | 591 | 161 | 143
With no related allowance recorded, Interest Income Recognized |  |  | 4 |  | 8 | 18
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  |  | 2 |  | 3
With a specific allowance recorded, Recorded Investment |  | 20 | 117 |  | 117 | 20
With a specific allowance recorded, Unpaid Principal Balance |  | 20 | 117 |  | 117 | 20
Related Allowance |  | 1 | 54 |  | 54 | 1
With a specific allowance recorded, Average Recorded Investment |  |  | 117 |  | 123 | 94
With a specific allowance recorded, Interest Income Recognized |  |  |  |  | 4 |
Recorded Investment | 1,334 | 20 | 247 | 1,334 | 247 | 20
Unpaid Principal Balance | 1,334 | 20 | 247 | 1,334 | 247 | 20
Average Recorded Investment | 1,309 |  | 247 | 591 | 284 | 237
Interest Income Recognized |  |  | 4 |  | 12 | 18
Interest Income Recognized Cash Basis |  |  |  | 2 |  | 3
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 1,251 | 180 | 180 | 1,251 | 180 | 180
With no related allowance recorded, Unpaid Principal Balance | 1,251 | 180 | 180 | 1,251 | 180 | 180
With no related allowance recorded, Average Recorded Investment | 1,505 |  | 2,519 | 1,162 | 1,768 | 1,445
With no related allowance recorded, Interest Income Recognized | 9 |  | 4 | 20 | 38 | 70
With no related allowance recorded, Interest Income Recognized Cash Basis | 14 |  | 1 | 33 | 7 | 9
With a specific allowance recorded, Recorded Investment | 2,936 | 3,381 | 3,427 | 2,936 | 3,427 | 3,381
With a specific allowance recorded, Unpaid Principal Balance | 2,936 | 3,381 | 3,427 | 2,936 | 3,427 | 3,381
Related Allowance | 500 | 664 | 710 | 500 | 710 | 664
With a specific allowance recorded, Average Recorded Investment | 2,960 |  | 1,395 | 3,270 | 1,800 | 2,199
With a specific allowance recorded, Interest Income Recognized | 39 |  | 31 | 113 | 58 | 70
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  |  |  | 3 | 3
Recorded Investment | 4,187 | 3,561 | 3,607 | 4,187 | 3,607 | 3,561
Unpaid Principal Balance | 4,187 | 3,561 | 3,607 | 4,187 | 3,607 | 3,561
Average Recorded Investment | 4,465 |  | 3,914 | 4,432 | 3,568 | 3,644
Interest Income Recognized | 48 |  | 35 | 133 | 96 | 140
Interest Income Recognized Cash Basis | 14 |  | 1 | 33 | 10 | 12
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 21 | 21 | 215 | 21 | 215 | 21
With no related allowance recorded, Unpaid Principal Balance | 21 | 21 | 215 | 21 | 215 | 21
With no related allowance recorded, Average Recorded Investment | 63 |  | 525 | 175 | 1,206 | 920
With no related allowance recorded, Interest Income Recognized |  |  |  | 2 | 24 | 24
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  | 1 | 10 | 4 | 158
With a specific allowance recorded, Recorded Investment | 1,982 | 982 | 1,000 | 1,982 | 1,000 | 982
With a specific allowance recorded, Unpaid Principal Balance | 1,982 | 982 | 1,000 | 1,982 | 1,000 | 982
Related Allowance | 1,936 | 825 | 1,000 | 1,936 | 1,000 | 825
With a specific allowance recorded, Average Recorded Investment | 1,989 |  | 333 | 1,665 | 334 | 498
With a specific allowance recorded, Interest Income Recognized | 72 |  | 2 | 138 | 2 | 17
Recorded Investment | 2,003 | 1,003 | 1,215 | 2,003 | 1,215 | 1,003
Unpaid Principal Balance | 2,003 | 1,003 | 1,215 | 2,003 | 1,215 | 1,003
Average Recorded Investment | 2,052 |  | 858 | 1,840 | 1,540 | 1,418
Interest Income Recognized | 72 |  | 2 | 140 | 26 | 41
Interest Income Recognized Cash Basis |  |  | 1 | 10 | 4 | 158
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 17 |  | 15 | 17 | 15 |
With no related allowance recorded, Unpaid Principal Balance | 17 |  | 15 | 17 | 15 |
With no related allowance recorded, Average Recorded Investment | 17 |  | 16 | 18 | 19 | 17
With no related allowance recorded, Interest Income Recognized |  |  |  | 1 | 1 |
With a specific allowance recorded, Recorded Investment |  | 26 |  |  |  | 26
With a specific allowance recorded, Unpaid Principal Balance |  | 26 |  |  |  | 26
Related Allowance |  | 3 |  |  |  | 3
With a specific allowance recorded, Average Recorded Investment |  |  |  | 3 |  | 2
With a specific allowance recorded, Interest Income Recognized |  |  |  |  |  | 1
Recorded Investment | 17 | 26 | 15 | 17 | 15 | 26
Unpaid Principal Balance | 17 | $ 26 | 15 | 17 | 15 | 26
Average Recorded Investment | $ 17 |  | $ 16 | 21 | 19 | 19
Interest Income Recognized |  |  |  | $ 1 | $ 1 | $ 1

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