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Loans - Summary of Impaired Loans by Loan Portfolio Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment $ 2,562 $ 1,324
Impaired Loans with Allowance: Unpaid Principal Balance 2,562 1,324
Impaired Loans with Allowance: Related Allowance 1,192 932
Impaired Loans with No Allowance: Recorded Investment 8,072 10,621
Impaired Loans with No Allowance: Unpaid Principal Balance 8,072 10,822
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 1,353 948
Impaired Loans with Allowance: Unpaid Principal Balance 1,353 948
Impaired Loans with Allowance: Related Allowance 698 599
Impaired Loans with No Allowance: Recorded Investment 390 1,178
Impaired Loans with No Allowance: Unpaid Principal Balance 390 1,178
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 832 0
Impaired Loans with Allowance: Unpaid Principal Balance 832 0
Impaired Loans with Allowance: Related Allowance 117 0
Impaired Loans with No Allowance: Recorded Investment 7,581 8,764
Impaired Loans with No Allowance: Unpaid Principal Balance 7,581 8,965
Commercial real estate construction    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment   0
Impaired Loans with Allowance: Unpaid Principal Balance   0
Impaired Loans with Allowance: Related Allowance   0
Impaired Loans with No Allowance: Recorded Investment   300
Impaired Loans with No Allowance: Unpaid Principal Balance   300
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 377 376
Impaired Loans with Allowance: Unpaid Principal Balance 377 376
Impaired Loans with Allowance: Related Allowance 377 333
Impaired Loans with No Allowance: Recorded Investment 101 379
Impaired Loans with No Allowance: Unpaid Principal Balance $ 101 $ 379