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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, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | $ 5,680 | $ 1,228 | $ 3,063 | $ 5,680 | $ 3,063 | $ 1,228
With a specific allowance recorded, Recorded Investment | 4,989 | 10,711 | 8,976 | 4,989 | 8,976 | 10,711
Related Allowance | 2,419 | 2,184 | 1,156 | 2,419 | 1,156 | 2,184
Recorded Investment | 10,669 | 11,939 | 12,039 | 10,669 | 12,039 | 11,939
Average Recorded Investment | 9,748 | 11,676 | 12,206 | 11,258 | 12,836 | 12,247
Consumer Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 657 | 604 | 770 | 657 | 770 | 604
With no related allowance recorded, Unpaid Principal Balance | 657 | 604 | 823 | 657 | 823 | 604
With no related allowance recorded, Average Recorded Investment | 390 |  | 494 | 381 | 501 | 456
With no related allowance recorded, Interest Income Recognized | 1 |  | 1 | 2 | 3 | 5
With no related allowance recorded, Interest Income Recognized Cash Basis | 4 |  | 3 | 6 | 7 | 15
With a specific allowance recorded, Average Recorded Investment |  |  | 55 |  | 117 | 59
Recorded Investment | 657 | 604 | 770 | 657 | 770 | 604
Unpaid Principal Balance | 657 | 604 | 823 | 657 | 823 | 604
Average Recorded Investment | 390 |  | 549 | 381 | 618 | 515
Interest Income Recognized | 1 |  | 1 | 2 | 3 | 5
Interest Income Recognized Cash Basis | 4 |  | 3 | 6 | 7 | 15
Agricultural Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 2,414 | 423 | 728 | 2,414 | 728 | 423
With no related allowance recorded, Unpaid Principal Balance | 2,518 | 423 | 728 | 2,518 | 728 | 423
With no related allowance recorded, Average Recorded Investment | 2,247 |  | 994 | 1,696 | 1,262 | 1,000
With no related allowance recorded, Interest Income Recognized | 6 |  | 22 | 13 | 44 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  |  | 5 |  |
With a specific allowance recorded, Recorded Investment |  | 6,302 | 5,794 |  | 5,794 | 6,302
With a specific allowance recorded, Unpaid Principal Balance |  | 6,406 | 5,794 |  | 5,794 | 6,406
Related Allowance |  | 691 | 914 |  | 914 | 691
With a specific allowance recorded, Average Recorded Investment |  |  | 5,556 | 2,775 | 5,357 | 5,414
With a specific allowance recorded, Interest Income Recognized |  |  |  |  |  | 54
Recorded Investment | 2,414 | 6,725 | 6,522 | 2,414 | 6,522 | 6,725
Unpaid Principal Balance | 2,518 | 6,829 | 6,522 | 2,518 | 6,522 | 6,829
Average Recorded Investment | 2,247 |  | 6,550 | 4,471 | 6,619 | 6,414
Interest Income Recognized | 6 |  | 22 | 13 | 44 | 87
Interest Income Recognized Cash Basis | 3 |  |  | 5 |  |
With no related allowance recorded, Adjusted Interest Income Recognized |  |  |  |  |  | 33
Agricultural [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 1,296 |  | 131 | 1,296 | 131 |
With no related allowance recorded, Unpaid Principal Balance | 1,296 |  | 231 | 1,296 | 231 |
With no related allowance recorded, Average Recorded Investment | 445 |  | 184 | 233 | 176 | 143
With no related allowance recorded, Interest Income Recognized |  |  | 4 |  | 6 | 18
With no related allowance recorded, Interest Income Recognized Cash Basis | 1 |  |  | 1 |  | 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 | 117 |  | 117 | 1
With a specific allowance recorded, Average Recorded Investment |  |  | 39 |  | 127 | 94
Recorded Investment | 1,296 | 20 | 248 | 1,296 | 248 | 20
Unpaid Principal Balance | 1,296 | 20 | 348 | 1,296 | 348 | 20
Average Recorded Investment | 445 |  | 223 | 233 | 303 | 237
Interest Income Recognized |  |  | 4 |  | 6 | 18
Interest Income Recognized Cash Basis | 1 |  |  | 1 |  | 3
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 1,148 | 180 | 181 | 1,148 | 181 | 180
With no related allowance recorded, Unpaid Principal Balance | 1,148 | 180 | 181 | 1,148 | 181 | 180
With no related allowance recorded, Average Recorded Investment | 1,323 |  | 480 | 991 | 1,393 | 1,445
With no related allowance recorded, Interest Income Recognized | 7 |  | 4 | 11 | 8 | 70
With no related allowance recorded, Interest Income Recognized Cash Basis | 14 |  | 3 | 19 | 6 | 9
With a specific allowance recorded, Recorded Investment | 2,985 | 3,381 | 3,065 | 2,985 | 3,065 | 3,381
With a specific allowance recorded, Unpaid Principal Balance | 2,985 | 3,381 | 3,065 | 2,985 | 3,065 | 3,381
Related Allowance | 573 | 664 | 125 | 573 | 125 | 664
With a specific allowance recorded, Average Recorded Investment | 3,105 |  | 3,087 | 3,426 | 2,002 | 2,199
With a specific allowance recorded, Interest Income Recognized | 38 |  | 27 | 74 | 54 | 70
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  | 3 |  | 3 | 3
Recorded Investment | 4,133 | 3,561 | 3,246 | 4,133 | 3,246 | 3,561
Unpaid Principal Balance | 4,133 | 3,561 | 3,246 | 4,133 | 3,246 | 3,561
Average Recorded Investment | 4,428 |  | 3,567 | 4,417 | 3,395 | 3,644
Interest Income Recognized | 45 |  | 31 | 85 | 62 | 140
Interest Income Recognized Cash Basis | 14 |  | 6 | 19 | 9 | 12
Commercial and Industrial [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 145 | 21 | 1,236 | 145 | 1,236 | 21
With no related allowance recorded, Unpaid Principal Balance | 145 | 21 | 1,367 | 145 | 1,367 | 21
With no related allowance recorded, Average Recorded Investment | 207 |  | 1,298 | 231 | 1,546 | 920
With no related allowance recorded, Interest Income Recognized |  |  | 6 | 2 | 23 | 24
With no related allowance recorded, Interest Income Recognized Cash Basis | 10 |  | 2 | 10 | 3 | 158
With a specific allowance recorded, Recorded Investment | 2,004 | 982 |  | 2,004 |  | 982
With a specific allowance recorded, Unpaid Principal Balance | 2,004 | 982 |  | 2,004 |  | 982
Related Allowance | 1,846 | 825 |  | 1,846 |  | 825
With a specific allowance recorded, Average Recorded Investment | 2,011 |  |  | 1,502 | 335 | 498
With a specific allowance recorded, Interest Income Recognized | 52 |  |  | 65 |  | 17
Recorded Investment | 2,149 | 1,003 | 1,236 | 2,149 | 1,236 | 1,003
Unpaid Principal Balance | 2,149 | 1,003 | 1,367 | 2,149 | 1,367 | 1,003
Average Recorded Investment | 2,218 |  | 1,298 | 1,733 | 1,881 | 1,418
Interest Income Recognized | 52 |  | 6 | 67 | 23 | 41
Interest Income Recognized Cash Basis | 10 |  | 2 | 10 | 3 | 158
Consumer [Member] |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |
With no related allowance recorded, Recorded Investment | 20 |  | 17 | 20 | 17 |
With no related allowance recorded, Unpaid Principal Balance | 20 |  | 27 | 20 | 27 |
With no related allowance recorded, Average Recorded Investment | 20 |  | 19 | 19 | 20 | 17
With no related allowance recorded, Interest Income Recognized |  |  |  | 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 |  |  |  | 4 |  | 2
With a specific allowance recorded, Interest Income Recognized |  |  |  |  |  | 1
Recorded Investment | 20 | 26 | 17 | 20 | 17 | 26
Unpaid Principal Balance | 20 | $ 26 | 27 | 20 | 27 | 26
Average Recorded Investment | $ 20 |  | $ 19 | 23 | $ 20 | 19
Interest Income Recognized |  |  |  | $ 1 |  | $ 1

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