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Loans - Impaired Financing Receivables with Related Allowances (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
With no related allowance recorded: |  |  |  |
Average Recorded Investment, Total | $ 23,392 | $ 18,183 | $ 21,774 | $ 18,382
Interest Income Recognized, Total | 155 | 190 | 254 | 369
Cash Basis Interest Recognized, Total | 155 | 190 | 254 | 369
Commercial, Industrial, and Agricultural |  |  |  |
With an allowance recorded: |  |  |  |
Average Recorded Investment | 3,838 | 1,398 | 3,197 | 1,480
Interest Income Recognized | 21 | 18 | 43 | 36
Cash Basis Interest Recognized | 21 | 18 | 43 | 36
With no related allowance recorded: |  |  |  |
Average Recorded Investment | 5,326 | 1,833 | 5,045 | 1,812
Interest Income Recognized | 45 | 34 | 91 | 50
Cash Basis Interest Recognized | 45 | 34 | 91 | 50
Commercial mortgages |  |  |  |
With an allowance recorded: |  |  |  |
Average Recorded Investment | 8,738 | 12,505 | 9,069 | 13,459
Interest Income Recognized | 56 | 71 | 74 | 216
Cash Basis Interest Recognized | 56 | 71 | 74 | 216
With no related allowance recorded: |  |  |  |
Average Recorded Investment | 5,490 | 2,447 | 4,463 | 1,631
Interest Income Recognized | 33 | 67 | 46 | 67
Cash Basis Interest Recognized | 33 | 67 | 46 | 67
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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