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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
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Mar. 31, 2017 | Mar. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | $ 1,321 | $ 0
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 10,341 | 10,672
Impaired Loans with No Allowance: Interest Income | 129 | 123
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | 945 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 1,134 | 1,439
Impaired Loans with No Allowance: Interest Income | 0 | 0
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 8,683 | 8,404
Impaired Loans with No Allowance: Interest Income | 90 | 118
Commercial real estate construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 150 | 374
Impaired Loans with No Allowance: Interest Income | 25 | 0
Residential mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | 376 | 0
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 374 | 455
Impaired Loans with No Allowance: Interest Income | $ 14 | $ 5

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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=66008989&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=66008989&loc=d3e5212-111524 + Details
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