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Loans - Summary of Impaired Loans by Loan Portfolio Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment $ 867 $ 2,520
Impaired Loans with Allowance: Unpaid Principal Balance 867 2,520
Impaired Loans with Allowance: Related Allowance 517 1,229
Impaired Loans with No Allowance: Recorded Investment 7,589 7,817
Impaired Loans with No Allowance: Unpaid Principal Balance 7,589 7,817
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 867 1,311
Impaired Loans with Allowance: Unpaid Principal Balance 867 1,311
Impaired Loans with Allowance: Related Allowance 517 792
Impaired Loans with No Allowance: Recorded Investment 179 188
Impaired Loans with No Allowance: Unpaid Principal Balance 179 188
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Recorded Investment 0 832
Impaired Loans with Allowance: Unpaid Principal Balance 0 832
Impaired Loans with Allowance: Related Allowance 0 60
Impaired Loans with No Allowance: Recorded Investment 7,309 7,528
Impaired Loans with No Allowance: Unpaid Principal Balance 7,309 7,528
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 0 377
Impaired Loans with Allowance: Unpaid Principal Balance 0 377
Impaired Loans with Allowance: Related Allowance 0 377
Impaired Loans with No Allowance: Recorded Investment 101 101
Impaired Loans with No Allowance: Unpaid Principal Balance $ 101 $ 101