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Loans - Summary of Impaired Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | $ 0 | $ 0
Impaired Loans with Allowance: Unpaid Principal Balance | 0 | 0
Impaired Loans with Allowance: Related Allowance | 0 | 0
Impaired Loans with No Allowance: Recorded Investment | 7,191 | 7,300
Impaired Loans with No Allowance: Unpaid Principal Balance | 7,191 | 7,300
Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | 0 | 0
Impaired Loans with Allowance: Unpaid Principal Balance | 0 | 0
Impaired Loans with Allowance: Related Allowance | 0 | 0
Impaired Loans with No Allowance: Recorded Investment | 0 | 0
Impaired Loans with No Allowance: Unpaid Principal Balance | 0 | 0
Commercial real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | 0 | 0
Impaired Loans with Allowance: Unpaid Principal Balance | 0 | 0
Impaired Loans with Allowance: Related Allowance | 0 | 0
Impaired Loans with No Allowance: Recorded Investment | 6,654 | 6,763
Impaired Loans with No Allowance: Unpaid Principal Balance | 6,654 | 6,763
Commercial real estate construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | 0 | 0
Impaired Loans with Allowance: Unpaid Principal Balance | 0 | 0
Impaired Loans with Allowance: Related Allowance | 0 | 0
Impaired Loans with No Allowance: Recorded Investment | 0 | 0
Impaired Loans with No Allowance: Unpaid Principal Balance | 0 | 0
Residential mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | 0 | 0
Impaired Loans with Allowance: Unpaid Principal Balance | 0 | 0
Impaired Loans with Allowance: Related Allowance | 0 | 0
Impaired Loans with No Allowance: Recorded Investment | 537 | 537
Impaired Loans with No Allowance: Unpaid Principal Balance | 537 | 537
Home equity lines of credit |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | 0 | 0
Impaired Loans with Allowance: Unpaid Principal Balance | 0 | 0
Impaired Loans with Allowance: Related Allowance | 0 | 0
Impaired Loans with No Allowance: Recorded Investment | 0 | 0
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 0 | $ 0

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