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Loans - Summary of Impaired Loans By Loan Portfolio Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
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 10,853 10,491
Impaired Loans with No Allowance: Unpaid Principal Balance 11,337 10,976
Commercial and industrial    
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 1,407 1,471
Impaired Loans with No Allowance: Unpaid Principal Balance 1,407 1,471
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 8,622 8,185
Impaired Loans with No Allowance: Unpaid Principal Balance 8,832 8,396
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 475 374
Impaired Loans with No Allowance: Unpaid Principal Balance 749 648
Residential mortgage    
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 349 461
Impaired Loans with No Allowance: Unpaid Principal Balance $ 349 $ 461