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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, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | $ 1,393 | $ 2,420 | $ 1,915 | $ 2,420
With a specific allowance recorded, Recorded Investment | 4,795 | 641 | 254 | 641
Related Allowance | 766 | 197 | 59 | 197
Recorded Investment | 6,188 | 3,061 | 2,169 | 3,061
Average Recorded Investment | 4,314 | 3,120 | 2,135 | 2,649
Consumer Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 644 | 648 | 648 | 648
With no related allowance recorded, Unpaid Principal Balance | 644 | 648 | 648 | 648
With no related allowance recorded, Average Recorded Investment | 649 |  | 603 | 626
With no related allowance recorded, Interest Income Recognized | 5 |  | 7 | 32
With no related allowance recorded, Interest Income Recognized Cash Basis | 4 |  | 1 | 9
With a specific allowance recorded, Recorded Investment | 194 | 181 | 254 | 181
With a specific allowance recorded, Unpaid Principal Balance | 194 | 184 | 254 | 184
Related Allowance | 34 | 30 | 59 | 30
With a specific allowance recorded, Average Recorded Investment | 212 |  | 254 | 211
Recorded Investment | 838 | 829 | 902 | 829
Unpaid Principal Balance | 838 | 832 | 902 | 832
Average Recorded Investment | 861 |  | 857 | 837
Interest Income Recognized | 5 |  | 7 | 32
Interest Income Recognized Cash Basis | 4 |  | 1 | 9
Agricultural Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 30 |  |  |
With no related allowance recorded, Unpaid Principal Balance | 30 |  |  |
With no related allowance recorded, Average Recorded Investment | 291 |  |  | 204
With no related allowance recorded, Interest Income Recognized | 3 |  |  |
With a specific allowance recorded, Recorded Investment | 92 |  |  |
With a specific allowance recorded, Unpaid Principal Balance | 92 |  |  |
Related Allowance | 15 |  |  |
With a specific allowance recorded, Average Recorded Investment | 93 |  |  | 22
With a specific allowance recorded, Interest Income Recognized | 2 |  |  | 1
Recorded Investment | 122 |  |  |
Unpaid Principal Balance | 122 |  |  |
Average Recorded Investment | 384 |  |  | 226
Interest Income Recognized | 5 |  |  | 1
Agricultural [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 348 | 491 |  | 491
With no related allowance recorded, Unpaid Principal Balance | 348 | 491 |  | 491
With no related allowance recorded, Average Recorded Investment | 386 |  |  | 124
With no related allowance recorded, Interest Income Recognized | 5 |  |  |
With a specific allowance recorded, Recorded Investment | 121 | 200 |  | 200
With a specific allowance recorded, Unpaid Principal Balance | 121 | 200 |  | 200
Related Allowance | 12 | 21 |  | 21
With a specific allowance recorded, Average Recorded Investment | 121 |  |  | 29
Recorded Investment | 469 | 691 |  | 691
Unpaid Principal Balance | 469 | 691 |  | 691
Average Recorded Investment | 507 |  |  | 153
Interest Income Recognized | 5 |  |  |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 186 | 299 | 192 | 299
With no related allowance recorded, Unpaid Principal Balance | 186 | 299 | 192 | 299
With no related allowance recorded, Average Recorded Investment | 224 |  | 193 | 238
With no related allowance recorded, Interest Income Recognized | 3 |  | 3 | 19
With a specific allowance recorded, Recorded Investment | 3,109 |  |  |
With a specific allowance recorded, Unpaid Principal Balance | 3,109 |  |  |
Related Allowance | 95 |  |  |
With a specific allowance recorded, Average Recorded Investment | 1,036 |  |  |
With a specific allowance recorded, Interest Income Recognized | 39 |  |  |
Recorded Investment | 3,295 | 299 | 192 | 299
Unpaid Principal Balance | 3,295 | 299 | 192 | 299
Average Recorded Investment | 1,260 |  | 193 | 238
Interest Income Recognized | 42 |  | 3 | 19
Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 154 | 982 | 1,075 | 982
With no related allowance recorded, Unpaid Principal Balance | 154 | 982 | 1,075 | 982
With no related allowance recorded, Average Recorded Investment | 699 |  | 1,085 | 637
With no related allowance recorded, Interest Income Recognized | 12 |  | 15 | 66
With a specific allowance recorded, Recorded Investment | 1,279 | 227 |  | 227
With a specific allowance recorded, Unpaid Principal Balance | 1,429 | 377 |  | 377
Related Allowance | 610 | 142 |  | 142
With a specific allowance recorded, Average Recorded Investment | 572 |  |  | 555
With a specific allowance recorded, Interest Income Recognized | 7 |  |  |
Recorded Investment | 1,433 | 1,209 | 1,075 | 1,209
Unpaid Principal Balance | 1,583 | 1,359 | 1,075 | 1,359
Average Recorded Investment | 1,271 |  | 1,085 | 1,192
Interest Income Recognized | 19 |  | $ 15 | 66
Consumer [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
With no related allowance recorded, Recorded Investment | 31 |  |  |
With no related allowance recorded, Unpaid Principal Balance | 31 |  |  |
With no related allowance recorded, Average Recorded Investment | 10 |  |  |
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 | 21 |  |  | 3
Recorded Investment | 31 | 33 |  | 33
Unpaid Principal Balance | 31 | $ 33 |  | 33
Average Recorded Investment | $ 31 |  |  | $ 3

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