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Bank Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross $ 25,863 $ 26,050
Accumulated depreciation and amortization (18,487) (17,438)
Bank premises and equipment, net 7,376 8,612
Depreciation and amortization 2,100 1,900
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross 15,024 14,937
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Bank premises and equipment, Gross $ 10,839 $ 11,113