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6. Federal Home Loan Bank and Federal Reserve Bank Borrowings (Tables)
12 Months Ended
Dec. 31, 2017
Banking and Thrift [Abstract]  
Borrowings from the FHLB outstanding
December 31, 2016  
(Dollars in thousands)                    
                     
Maturity Date   Call Date   Rate   Rate Type   Amount  
October 17, 2018     N/A   4.050%   Adjustable Rate Hybrid     5,000  
                       
October 17, 2018     N/A    4.065%     Adjustable Rate Hybrid     5,000  
                       
October 17, 2018     N/A   4.120%     Adjustable Rate Hybrid     5,000  
                         
May 8, 2018     N/A    2.683%     Adjustable Rate Hybrid     5,000  
                    $ 20,000