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Loans - Summary of Average of Impaired Loans and Related Interest Income by Loan Portfolio Class (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Average Recorded Investment $ 1,277 $ 1,321
Impaired Loans with Allowance: Interest Income 0 0
Impaired Loans with No Allowance: Average Recorded Investment 8,119 10,341
Impaired Loans with No Allowance: Interest Income 47 129
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Average Recorded Investment 1,089 945
Impaired Loans with Allowance: Interest Income 0 0
Impaired Loans with No Allowance: Average Recorded Investment 183 1,134
Impaired Loans with No Allowance: Interest Income 0 0
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Average Recorded Investment 0 0
Impaired Loans with Allowance: Interest Income 0 0
Impaired Loans with No Allowance: Average Recorded Investment 7,835 8,683
Impaired Loans with No Allowance: Interest Income 47 90
Commercial real estate construction    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Average Recorded Investment 0 0
Impaired Loans with Allowance: Interest Income 0 0
Impaired Loans with No Allowance: Average Recorded Investment 0 150
Impaired Loans with No Allowance: Interest Income 0 25
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with Allowance: Average Recorded Investment 188 376
Impaired Loans with Allowance: Interest Income 0 0
Impaired Loans with No Allowance: Average Recorded Investment 101 374
Impaired Loans with No Allowance: Interest Income $ 0 $ 14