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Bank Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross $ 26,050 $ 24,510  
Accumulated depreciation and amortization (17,438) (15,990)  
Bank premises and equipment, net 8,612 8,520  
Depreciation and amortization 1,900 1,800 $ 2,000
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross 14,937 13,883  
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Bank premises and equipment, Gross $ 11,113 $ 10,627