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Loans - Summary of Impaired Loans By Loan Portfolio Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment $ 1,321 $ 1,324
Impaired Loans with Allowance: Unpaid Principal Balance 1,321 1,324
Impaired Loans with Allowance: Related Allowance 928 932
Impaired Loans with No Allowance: Recorded Investment 10,110 10,621
Impaired Loans with No Allowance: Unpaid Principal Balance 10,110 10,822
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 945 948
Impaired Loans with Allowance: Unpaid Principal Balance 945 948
Impaired Loans with Allowance: Related Allowance 595 599
Impaired Loans with No Allowance: Recorded Investment 1,123 1,178
Impaired Loans with No Allowance: Unpaid Principal Balance 1,123 1,178
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 8,617 8,764
Impaired Loans with No Allowance: Unpaid Principal Balance 8,617 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 376 376
Impaired Loans with Allowance: Unpaid Principal Balance 376 376
Impaired Loans with Allowance: Related Allowance 333 333
Impaired Loans with No Allowance: Recorded Investment 370 379
Impaired Loans with No Allowance: Unpaid Principal Balance $ 370 $ 379