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Loans - Summary of Impaired Loans by Loan Portfolio Class (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
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 6,397 7,300
Impaired Loans with No Allowance: Unpaid Principal Balance 6,397 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 5,748 6,763
Impaired Loans with No Allowance: Unpaid Principal Balance 5,748 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 649 537
Impaired Loans with No Allowance: Unpaid Principal Balance 649 537
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