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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, 2019 | Mar. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | $ 0 | $ 1,277
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 7,245 | 8,119
Impaired Loans with No Allowance: Interest Income | 57 | 47
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 1,089
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 0 | 183
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 | 6,708 | 7,835
Impaired Loans with No Allowance: Interest Income | 57 | 47
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 | 0 | 0
Impaired Loans with No Allowance: Interest Income | 0 | 0
Residential mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 | 188
Impaired Loans with Allowance: Interest Income | 0 | 0
Impaired Loans with No Allowance: Average Recorded Investment | 537 | 101
Impaired Loans with No Allowance: Interest Income | 0 | $ 0
Home equity lines of credit |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Average Recorded Investment | 0 |
Impaired Loans with Allowance: Interest Income | 0 |
Impaired Loans with No Allowance: Average Recorded Investment | 0 |
Impaired Loans with No Allowance: Interest Income | $ 0 |

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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://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 Reference 2: 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 + Details
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