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Bank Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross $ 24,510 $ 23,502  
Accumulated depreciation and amortization (15,990) (14,197)  
Bank premises and equipment, net 8,520 9,305  
Depreciation and amortization 1,800 2,000 $ 1,600
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross 13,883 13,615  
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross $ 10,627 $ 9,887