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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment $ 434 $ 1,949 $ 852 $ 1,739
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 7,465 9,480 7,860 9,844
Impaired Loans with No Allowance: Interest Income 79 124 126 253
Commercial and industrial        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 434 1,156 726 1,085
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 89 1,101 122 1,115
Impaired Loans with No Allowance: Interest Income 44 0 44 0
Commercial real estate        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 0 416 0 0
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 7,275 8,144 7,637 8,346
Impaired Loans with No Allowance: Interest Income 35 123 82 213
Commercial real estate construction        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 0 0 0 277
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 0 0 0 100
Impaired Loans with No Allowance: Interest Income 0 0 0 25
Residential mortgage        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 0 377 126 377
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 101 235 101 283
Impaired Loans with No Allowance: Interest Income $ 0 $ 1 $ 0 $ 15