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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
With no related allowance recorded: |  |  |
Average Recorded Investment, Total | $ 17,725 | $ 20,715 | $ 18,369
Interest Income Recognized, Total | 599 | 915 | 660
Cash Basis Interest Recognized, Total | 599 | 886 | 660
Commercial, industrial, and agricultural |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 1,750 | 2,745 | 1,513
Interest Income Recognized | 90 | 254 | 97
Cash Basis Interest Recognized | 90 | 249 | 97
With no related allowance recorded: |  |  |
Average Recorded Investment | 4,919 | 4,642 | 2,438
Interest Income Recognized | 208 | 157 | 114
Cash Basis Interest Recognized | 208 | 148 | 114
Commercial mortgages |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 6,586 | 8,456 | 11,944
Interest Income Recognized | 119 | 338 | 327
Cash Basis Interest Recognized | 119 | 326 | 327
With no related allowance recorded: |  |  |
Average Recorded Investment | 3,985 | 4,566 | 2,474
Interest Income Recognized | 158 | 146 | 122
Cash Basis Interest Recognized | 158 | 144 | 122
Residential real estate |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 191 | 304 | 0
Interest Income Recognized | 13 | 20 | 0
Cash Basis Interest Recognized | 13 | 19 | 0
With no related allowance recorded: |  |  |
Average Recorded Investment | 294 | 0 | 0
Interest Income Recognized | 11 | 0 | 0
Cash Basis Interest Recognized | 11 | 0 | $ 0
Overdrafts |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 0 | 2 |
Interest Income Recognized | 0 | 0 |
Cash Basis Interest Recognized | 0 | $ 0 |
With no related allowance recorded: |  |  |
Average Recorded Investment | 0 |  |
Interest Income Recognized | 0 |  |
Cash Basis Interest Recognized | $ 0 |  |

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524 + Details
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