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Loans - Impaired Financing Receivables with Related Allowances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
With no related allowance recorded: |  |  |  |
Average Recorded Investment, Total | $ 23,224 | $ 18,037 | $ 21,414 | $ 18,327
Interest Income Recognized, Total | 137 | 153 | 391 | 522
Cash Basis Interest Recognized, Total | 137 | 153 | 391 | 522
Commercial, Industrial, and Agricultural |  |  |  |
With an allowance recorded: |  |  |  |
Average Recorded Investment | 3,460 | 1,190 | 2,672 | 1,413
Interest Income Recognized | 11 | 20 | 54 | 56
Cash Basis Interest Recognized | 11 | 20 | 54 | 56
With no related allowance recorded: |  |  |  |
Average Recorded Investment | 5,569 | 2,142 | 5,084 | 1,927
Interest Income Recognized | 69 | 23 | 160 | 73
Cash Basis Interest Recognized | 69 | 23 | 160 | 73
Commercial mortgages |  |  |  |
With an allowance recorded: |  |  |  |
Average Recorded Investment | 9,042 | 9,724 | 9,147 | 12,497
Interest Income Recognized | 37 | 77 | 111 | 293
Cash Basis Interest Recognized | 37 | 77 | 111 | 293
With no related allowance recorded: |  |  |  |
Average Recorded Investment | 5,153 | 4,981 | 4,511 | 2,490
Interest Income Recognized | 20 | 33 | 66 | 100
Cash Basis Interest Recognized | 20 | 33 | 66 | 100
Residential Real Estate |  |  |  |
With an allowance recorded: |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
Cash Basis Interest Recognized | 0 | 0 | 0 | 0
With no related allowance recorded: |  |  |  |
Average Recorded Investment | 0 | 0 | 0 | 0
Interest Income Recognized | 0 | 0 | 0 | 0
Cash Basis Interest Recognized | $ 0 | $ 0 | $ 0 | $ 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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