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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment $ 374 $ 0 $ 187 $ 347
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 10,231 10,669 10,452 11,611
Impaired Loans with No Allowance: Interest Income 111 143 343 548
Commercial and industrial        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 0 0 0 0
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 1,361 1,549 1,400 1,621
Impaired Loans with No Allowance: Interest Income 3 0 3 129
Commercial real estate        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 0 0 0 0
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 8,156 8,608 8,280 9,275
Impaired Loans with No Allowance: Interest Income 104 134 327 405
Commercial real estate construction        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 0 0 0 0
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 300 154 337 251
Impaired Loans with No Allowance: Interest Income 0 0 0 0
Residential mortgage        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with Allowance: Average Recorded Investment 374 0 187 347
Impaired Loans with Allowance: Interest Income 0 0 0 0
Impaired Loans with No Allowance: Average Recorded Investment 414 358 435 464
Impaired Loans with No Allowance: Interest Income $ 4 $ 9 $ 13 $ 14