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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2016
Banking and Thrift [Abstract]  
Schedule of capital amounts and ratios
                            Minimum        
                            To Be "Well-        
                Minimum     Capitalized"     Well-Capitalized  
                For Capital     Under Prompt     With Buffer, Fully  
    Actual     Adequacy Purposes     Corrective Provisions     Phased in for 2019  
(Dollars in thousands)   Amount     Ratio     Amount     Ratio     Amount     Ratio     Amount     Ratio  
As of December 31, 2016                                          
Total Core Capital (to Risk-Weighted Assets)   $ 29,264       18.45 %     ³$12,689       ³8.0 %     ³$15,861       ³10.0 %     ³$16,654       ³10.5 %
Tier 1 Capital (to Risk-Weighted Assets)     28,274       17.83       ³9,516       ³6.0       ³12,689       ³8.0       ³13,482       ³8.5  
Tier 1 Common Equity (to Risk-Weighted Assets)     28,274       17.83       ³7,137       ³4.5       ³10,309       ³6.5       ³11,102       ³7.0  
Tier 1 Capital (to Assets)     28,274       10.70       ³10,572       ³4.0       ³13,214       ³5.0       ³13,214       ³5.0  
As of December 31, 2015:                                                                
Total Core Capital (to Risk-Weighted Assets)   $ 20,757       15.12 %     ³$10,980       ³8.0 %     ³$13,725       ³10.0 %                
Tier 1 Capital (to Risk-Weighted Assets)     19,946       14.53       ³8,235       ³6.0       ³10,980       ³8.0                  
Tier 1 Common Equity (to Risk-Weighted Assets)     19,946       14.53       ³6,176       ³4.5       ³8,921       ³6.5                  
Tier 1 Capital (to Assets)     19,946       7.85       ³10,167       ³4.0       ³12,709       ³5.0