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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | $ 6,604 | $ 5,172 | $ 1,393 | $ 5,172
With a specific allowance recorded, Recorded Investment | 5,532 | 9,360 | 4,795 | 9,360
Related Allowance | 1,109 | 1,657 | 766 | 1,657
Recorded Investment | 12,136 | 14,532 | 6,188 | 14,532
Average Recorded Investment | 13,467 | 14,868 | 4,314 | 10,234
Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 817 | 799 | 644 | 799
With no related allowance recorded, Unpaid Principal Balance | 817 | 799 | 644 | 799
With no related allowance recorded, Average Recorded Investment | 508 |  | 649 | 738
With no related allowance recorded, Interest Income Recognized | 1 |  | 5 | 22
With no related allowance recorded, Interest Income Recognized Cash Basis | 2 |  | 4 | 10
With a specific allowance recorded, Recorded Investment | 134 | 202 | 194 | 202
With a specific allowance recorded, Unpaid Principal Balance | 134 | 202 | 194 | 202
Related Allowance | 23 | 31 | 34 | 31
With a specific allowance recorded, Average Recorded Investment | 179 |  | 212 | 126
With a specific allowance recorded, Interest Income Recognized Cash Basis | 2 |  |  | 3
Recorded Investment | 951 | 1,001 | 838 | 1,001
Unpaid Principal Balance | 951 | 1,001 | 838 | 1,001
Average Recorded Investment | 687 |  | 861 | 864
Interest Income Recognized | 1 |  | 5 | 22
Interest Income Recognized Cash Basis | 4 |  | 4 | 13
Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 1,526 | 1,546 | 30 | 1,546
With no related allowance recorded, Unpaid Principal Balance | 1,526 | 1,549 | 30 | 1,549
With no related allowance recorded, Average Recorded Investment | 1,531 |  | 291 | 729
With no related allowance recorded, Interest Income Recognized | 23 |  | 3 | 18
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  |  | 12
With a specific allowance recorded, Recorded Investment | 5,106 | 5,210 | 92 | 5,210
With a specific allowance recorded, Unpaid Principal Balance | 5,106 | 5,210 | 92 | 5,210
Related Allowance | 1,086 | 600 | 15 | 600
With a specific allowance recorded, Average Recorded Investment | 5,160 |  | 93 | 3,175
With a specific allowance recorded, Interest Income Recognized |  |  | 2 | 6
With a specific allowance recorded, Interest Income Recognized Cash Basis |  |  |  | 102
Recorded Investment | 6,632 | 6,756 | 122 | 6,756
Unpaid Principal Balance | 6,632 | 6,759 | 122 | 6,759
Average Recorded Investment | 6,691 |  | 384 | 3,904
Interest Income Recognized | 23 |  | 5 | 24
Interest Income Recognized Cash Basis |  |  |  | 114
Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment |  | 291 | 348 | 291
With no related allowance recorded, Unpaid Principal Balance |  | 291 | 348 | 291
With no related allowance recorded, Average Recorded Investment | 168 |  | 386 | 392
With no related allowance recorded, Interest Income Recognized |  |  | 5 | 3
With no related allowance recorded, Interest Income Recognized Cash Basis |  |  |  | 3
With a specific allowance recorded, Recorded Investment | 292 | 176 | 121 | 176
With a specific allowance recorded, Unpaid Principal Balance | 292 | 176 | 121 | 176
Related Allowance |  | 116 | 12 | 116
With a specific allowance recorded, Average Recorded Investment | 214 |  | 121 | 188
With a specific allowance recorded, Interest Income Recognized | 4 |  |  |
Recorded Investment | 292 | 467 | 469 | 467
Unpaid Principal Balance | 292 | 467 | 469 | 467
Average Recorded Investment | 382 |  | 507 | 580
Interest Income Recognized | 4 |  | 5 | 3
Interest Income Recognized Cash Basis |  |  |  | 3
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 2,905 | 185 | 186 | 185
With no related allowance recorded, Unpaid Principal Balance | 2,905 | 185 | 186 | 185
With no related allowance recorded, Average Recorded Investment | 2,306 |  | 224 | 195
With no related allowance recorded, Interest Income Recognized | 31 |  | 3 | 13
With no related allowance recorded, Interest Income Recognized Cash Basis | 3 |  |  |
With a specific allowance recorded, Recorded Investment |  | 2,765 | 3,109 | 2,765
With a specific allowance recorded, Unpaid Principal Balance |  | 2,765 | 3,109 | 2,765
Related Allowance |  | 20 | 95 | 20
With a specific allowance recorded, Average Recorded Investment | 917 |  | 1,036 | 2,524
With a specific allowance recorded, Interest Income Recognized |  |  | 39 | 128
Recorded Investment | 2,905 | 2,950 | 3,295 | 2,950
Unpaid Principal Balance | 2,905 | 2,950 | 3,295 | 2,950
Average Recorded Investment | 3,223 |  | 1,260 | 2,719
Interest Income Recognized | 31 |  | 42 | 141
Interest Income Recognized Cash Basis | 3 |  |  |
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 1,335 | 2,328 | 154 | 2,328
With no related allowance recorded, Unpaid Principal Balance | 1,467 | 2,328 | 154 | 2,328
With no related allowance recorded, Average Recorded Investment | 1,793 |  | 699 | 1,222
With no related allowance recorded, Interest Income Recognized | 17 |  | 12 | 26
With no related allowance recorded, Interest Income Recognized Cash Basis | 1 |  |  | 5
With a specific allowance recorded, Recorded Investment |  | 1,007 | 1,279 | 1,007
With a specific allowance recorded, Unpaid Principal Balance |  | 1,007 | 1,429 | 1,007
Related Allowance |  | 890 | 610 | 890
With a specific allowance recorded, Average Recorded Investment | 670 |  | 572 | 916
With a specific allowance recorded, Interest Income Recognized |  |  | 7 | 52
Recorded Investment | 1,335 | 3,335 | 1,433 | 3,335
Unpaid Principal Balance | 1,467 | 3,335 | 1,583 | 3,335
Average Recorded Investment | 2,463 |  | 1,271 | 2,138
Interest Income Recognized | 17 |  | 19 | 78
Interest Income Recognized Cash Basis | 1 |  |  | 5
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 21 | 23 | 31 | 23
With no related allowance recorded, Unpaid Principal Balance | 21 | 23 | 31 | 23
With no related allowance recorded, Average Recorded Investment | 21 |  | 10 | 16
With a specific allowance recorded, Average Recorded Investment |  |  | 21 | 11
With a specific allowance recorded, Interest Income Recognized |  |  |  | 1
Recorded Investment | 21 | 23 | 31 | 23
Unpaid Principal Balance | 21 | $ 23 | 31 | 23
Average Recorded Investment | $ 21 |  | $ 31 | 27
Interest Income Recognized |  |  |  | $ 1

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