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Bank Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross $ 23,502 $ 22,906  
Accumulated depreciation and amortization (14,197) (13,047)  
Bank premises and equipment, net 9,305 9,859  
Depreciation and amortization 2,000 1,600 $ 1,400
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross 13,615 13,866  
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross $ 9,887 $ 9,040