Premises and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment      
Property, plant and equipment, gross $ 27,546,000 $ 25,881,000  
Less accumulated depreciation and amortization (9,085,000) (8,174,000)  
Property, plant and equipment, net 18,461,000 17,707,000  
Depreciation of premises and equipment 1,076,000 809,000 $ 755,000
Land      
Property, Plant and Equipment      
Property, plant and equipment, gross 1,914,000 1,914,000  
Buildings and improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 17,820,000 17,820,000  
Leasehold Improvements [Member]      
Property, Plant and Equipment      
Property, plant and equipment, gross 1,352,000 391,000  
Furniture, fixtures and equipment      
Property, Plant and Equipment      
Property, plant and equipment, gross 3,832,000 3,638,000  
Computer Equipment [Member]      
Property, Plant and Equipment      
Property, plant and equipment, gross 1,924,000 1,883,000  
Construction in Progress [Member]      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 704,000 $ 235,000