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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, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
With a specific allowance recorded, Recorded Investment | $ 8,976 | $ 9,360 | $ 9,872 | $ 8,976 | $ 9,872 | $ 9,360 |
Related Allowance | 1,156 | 1,657 | 1,170 | 1,156 | 1,170 | 1,657 |
Recorded Investment | 12,039 | 14,532 | 12,567 | 12,039 | 12,567 | 14,532 |
Average Recorded Investment | 12,206 | 14,868 | 8,352 | 12,836 | 6,333 | 10,234 |
With no related allowance recorded, Recorded Investment | 3,063 | 5,172 | 2,695 | 3,063 | 2,695 | 5,172 |
Consumer Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
With a specific allowance recorded, Recorded Investment |  | 202 | 60 |  | 60 | 202 |
With a specific allowance recorded, Unpaid Principal Balance |  | 202 | 60 |  | 60 | 202 |
Related Allowance |  | 31 | 16 |  | 16 | 31 | $ 16
With a specific allowance recorded, Average Recorded Investment | 55 |  | 194 | 117 | 203 | 126 |
With a specific allowance recorded, Interest Income Recognized |  |  | 1 |  | 3 |  |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  | 1 |  | 1 | 3 |
Recorded Investment | 770 | 1,001 | 847 | 770 | 847 | 1,001 | 847
Unpaid Principal Balance | 823 | 1,001 | 847 | 823 | 847 | 1,001 | 847
Average Recorded Investment | 549 |  | 818 | 618 | 840 | 864 |
Interest Income Recognized | 1 |  | 5 | 3 | 11 | 22 |
Interest Income Recognized Cash Basis | 3 |  | 1 | 7 | 4 | 13 |
With no related allowance recorded, Recorded Investment | 770 | 799 | 787 | 770 | 787 | 799 |
With no related allowance recorded, Unpaid Principal Balance | 823 | 799 | 787 | 823 | 787 | 799 |
With no related allowance recorded, Average Recorded Investment | 494 |  | 624 | 501 | 637 | 738 |
With no related allowance recorded, Interest Income Recognized | 1 |  | 4 | 3 | 8 | 22 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  |  | 7 | 3 | 10 |
Agricultural Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
With a specific allowance recorded, Recorded Investment | 5,794 | 5,210 | 5,469 | 5,794 | 5,469 | 5,210 |
With a specific allowance recorded, Unpaid Principal Balance | 5,794 | 5,210 | 5,469 | 5,794 | 5,469 | 5,210 |
Related Allowance | 914 | 600 | 438 | 914 | 438 | 600 | 438
With a specific allowance recorded, Average Recorded Investment | 5,556 |  | 1,884 | 5,357 | 988 | 3,175 |
With a specific allowance recorded, Interest Income Recognized |  |  | 1 |  | 3 | 6 |
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  |  |  |  | 102 |
Recorded Investment | 6,522 | 6,756 | 5,990 | 6,522 | 5,990 | 6,756 | 5,990
Unpaid Principal Balance | 6,522 | 6,759 | 5,990 | 6,522 | 5,990 | 6,759 | 5,990
Average Recorded Investment | 6,550 |  | 2,071 | 6,619 | 1,227 | 3,904 |
Interest Income Recognized | 22 |  | 6 | 44 | 10 | 24 |
Interest Income Recognized Cash Basis |  |  |  |  |  | 114 |
With no related allowance recorded, Recorded Investment | 728 | 1,546 | 521 | 728 | 521 | 1,546 |
With no related allowance recorded, Unpaid Principal Balance | 728 | 1,549 | 521 | 728 | 521 | 1,549 |
With no related allowance recorded, Average Recorded Investment | 994 |  | 187 | 1,262 | 239 | 729 |
With no related allowance recorded, Interest Income Recognized | 22 |  | 5 | 44 | 7 | 18 |
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  |  |  |  | 12 |
Agricultural [Member] |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
With a specific allowance recorded, Recorded Investment | 117 | 176 | 240 | 117 | 240 | 176 |
With a specific allowance recorded, Unpaid Principal Balance | 117 | 176 | 240 | 117 | 240 | 176 |
Related Allowance | 117 | 116 | 98 | 117 | 98 | 116 | 98
With a specific allowance recorded, Average Recorded Investment | 39 |  | 161 | 127 | 141 | 188 |
With a specific allowance recorded, Interest Income Recognized |  |  | 9 |  |  |  |
Recorded Investment | 248 | 467 | 623 | 248 | 623 | 467 | 623
Unpaid Principal Balance | 348 | 467 | 623 | 348 | 623 | 467 | 623
Average Recorded Investment | 223 |  | 501 | 303 | 504 | 580 |
Interest Income Recognized | 4 |  | 13 | 6 | 8 | 3 |
Interest Income Recognized Cash Basis |  |  |  |  |  | 3 |
With no related allowance recorded, Recorded Investment | 131 | 291 | 383 | 131 | 383 | 291 |
With no related allowance recorded, Unpaid Principal Balance | 231 | 291 | 383 | 231 | 383 | 291 |
With no related allowance recorded, Average Recorded Investment | 184 |  | 340 | 176 | 363 | 392 |
With no related allowance recorded, Interest Income Recognized | 4 |  | 4 | 6 | 8 | 3 |
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  |  |  |  | 3 |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
With a specific allowance recorded, Recorded Investment | 3,065 | 2,765 | 3,072 | 3,065 | 3,072 | 2,765 |
With a specific allowance recorded, Unpaid Principal Balance | 3,065 | 2,765 | 3,072 | 3,065 | 3,072 | 2,765 |
Related Allowance | 125 | 20 | 58 | 125 | 58 | 20 | 58
With a specific allowance recorded, Average Recorded Investment | 3,087 |  | 3,085 | 2,002 | 2,061 | 2,524 |
With a specific allowance recorded, Interest Income Recognized | 27 |  | 39 | 54 | 78 | 128 |
With a specific allowance recorded, Interest Income Recognized Cash Basis | 3 |  |  | 3 |  |  |
Recorded Investment | 3,246 | 2,950 | 3,258 | 3,246 | 3,258 | 2,950 | 3,258
Unpaid Principal Balance | 3,246 | 2,950 | 3,258 | 3,246 | 3,258 | 2,950 | 3,258
Average Recorded Investment | 3,567 |  | 3,271 | 3,395 | 2,266 | 2,719 |
Interest Income Recognized | 31 |  | 39 | 62 | 82 | 141 |
Interest Income Recognized Cash Basis | 6 |  |  | 9 |  |  |
With no related allowance recorded, Recorded Investment | 181 | 185 | 186 | 181 | 186 | 185 |
With no related allowance recorded, Unpaid Principal Balance | 181 | 185 | 186 | 181 | 186 | 185 |
With no related allowance recorded, Average Recorded Investment | 480 |  | 186 | 1,393 | 205 | 195 |
With no related allowance recorded, Interest Income Recognized | 4 |  |  | 8 | 4 | 13 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  |  | 6 |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
With a specific allowance recorded, Recorded Investment |  | 1,007 | 1,031 |  | 1,031 | 1,007 |
With a specific allowance recorded, Unpaid Principal Balance |  | 1,007 | 1,031 |  | 1,031 | 1,007 |
Related Allowance |  | 890 | 560 |  | 560 | 890 | 560
With a specific allowance recorded, Average Recorded Investment |  |  | 1,095 | 335 | 834 | 916 |
With a specific allowance recorded, Interest Income Recognized |  |  | 11 |  | 27 | 52 |
Recorded Investment | 1,236 | 3,335 | 1,822 | 1,236 | 1,822 | 3,335 | 1,822
Unpaid Principal Balance | 1,367 | 3,335 | 1,822 | 1,367 | 1,822 | 3,335 | 1,822
Average Recorded Investment | 1,298 |  | 1,663 | 1,881 | 1,467 | 2,138 |
Interest Income Recognized | 6 |  | 15 | 23 | 33 | 78 |
Interest Income Recognized Cash Basis | 2 |  |  | 3 |  | 5 |
With no related allowance recorded, Recorded Investment | 1,236 | 2,328 | 791 | 1,236 | 791 | 2,328 |
With no related allowance recorded, Unpaid Principal Balance | 1,367 | 2,328 | 791 | 1,367 | 791 | 2,328 |
With no related allowance recorded, Average Recorded Investment | 1,298 |  | 568 | 1,546 | 633 | 1,222 |
With no related allowance recorded, Interest Income Recognized | 6 |  | 4 | 23 | 6 | 26 |
With no related allowance recorded, Interest Income Recognized Cash Basis | 2 |  |  | 3 |  | 5 |
Consumer [Member] |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |
With a specific allowance recorded, Average Recorded Investment |  |  |  |  | 10 | 11 |
With a specific allowance recorded, Interest Income Recognized |  |  |  |  |  | 1 |
Recorded Investment | 17 | 23 | 27 | 17 | 27 | 23 | 27
Unpaid Principal Balance | 27 | 23 | 27 | 27 | 27 | 23 | $ 27
Average Recorded Investment | 19 |  | 28 | 20 | 29 | 27 |
Interest Income Recognized |  |  |  |  | 1 | 1 |
With no related allowance recorded, Recorded Investment | 17 | 23 | 27 | 17 | 27 | 23 |
With no related allowance recorded, Unpaid Principal Balance | 27 | $ 23 | 27 | 27 | 27 | 23 |
With no related allowance recorded, Average Recorded Investment | $ 19 |  | $ 28 | $ 20 | 19 | $ 16 |
With no related allowance recorded, Interest Income Recognized |  |  |  |  | $ 1 |  |

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