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Loans - Summary of Average of Impaired Loans and Related Interest Income by Loan Portfolio Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | $ 2,570 | $ 374 | $ 1,945 | $ 187
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 8,461 | 10,231 | 9,402 | 10,452
Impaired Loans with No Allowance: Interest Income | 80 | 111 | 333 | 343
Commercial and industrial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 1,360 | 0 | 1,152 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 734 | 1,361 | 934 | 1,400
Impaired Loans with No Allowance: Interest Income | 0 | 3 | 0 | 3
Commercial real estate |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 832 | 0 | 416 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 7,626 | 8,156 | 8,155 | 8,280
Impaired Loans with No Allowance: Interest Income | 80 | 104 | 293 | 327
Commercial real estate construction |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 0 | 0 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 0 | 300 | 75 | 337
Impaired Loans with No Allowance: Interest Income | 0 | 0 | 25 | 0
Residential mortgage |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with Allowance: Average Recorded Investment | 378 | 374 | 377 | 187
Impaired Loans with Allowance: Interest Income | 0 | 0 | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 101 | 414 | 238 | 435
Impaired Loans with No Allowance: Interest Income | $ 0 | $ 4 | $ 15 | $ 13

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- Definition Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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