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Loans - Impaired Financing Receivables with Related and not Related Allowances (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
With no related allowance recorded: |  |  |
Average Recorded Investment, Total | $ 20,715 | $ 18,369 | $ 15,867
Interest Income Recognized, Total | 915 | 660 | 8
Cash Basis Interest Recognized, Total | 886 | 660 | 8
Commercial, industrial, and agricultural |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 2,745 | 1,513 | 2,616
Interest Income Recognized | 254 | 97 | 2
Cash Basis Interest Recognized | 249 | 97 | 2
With no related allowance recorded: |  |  |
Average Recorded Investment | 4,642 | 2,438 | 2,290
Interest Income Recognized | 157 | 114 | 0
Cash Basis Interest Recognized | 148 | 114 | 0
Commercial mortgages |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 8,456 | 11,944 | 8,138
Interest Income Recognized | 338 | 327 | 0
Cash Basis Interest Recognized | 326 | 327 | 0
With no related allowance recorded: |  |  |
Average Recorded Investment | 4,566 | 2,474 | 2,773
Interest Income Recognized | 146 | 122 | 0
Cash Basis Interest Recognized | 144 | 122 | 0
Residential real estate |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 304 | 0 | 50
Interest Income Recognized | 20 | 0 | 6
Cash Basis Interest Recognized | 19 | 0 | 6
With no related allowance recorded: |  |  |
Average Recorded Investment | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0
Cash Basis Interest Recognized | 0 | $ 0 | $ 0
Overdrafts |  |  |
With an allowance recorded: |  |  |
Average Recorded Investment | 2 |  |
Interest Income Recognized | 0 |  |
Cash Basis Interest Recognized | 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=84173941&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=84173941&loc=d3e5258-111524 + Details
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