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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017                                                                
Total Core Capital (to Risk-Weighted Assets)   $ 30,067       16.11 %     ³$14,927       ³8.0%       ³$18,658       ³10.0%       ³$19,591       ³10.5%  
Tier 1 Capital (to Risk-Weighted Assets)     28,806       15.44       ³11,195       ³6.0       ³14,927       ³8.0       ³15,860       ³8.5  
Tier 1 Common Equity (to Risk-Weighted Assets)     28,806       15.44       ³8,396       ³4.5       ³12,128       ³6.5       ³13,061       ³7.0  
Tier 1 Capital (to Assets)     28,806       9.47       ³12,173       ³4.0       ³15,216       ³5.0       ³15,216       ³5.0  
As of December 31, 2016:                                                                
Total Core Capital (to Risk-Weighted Assets)   $ 29,180       18.41 %     ³$12,678       ³8.0%       ³$15,848       ³10.0%       ³$16,640       ³10.5%  
Tier 1 Capital (to Risk-Weighted Assets)     28,190       17.79       ³9,509       ³6.0       ³12,678       ³8.0       ³13,471       ³8.5  
Tier 1 Common Equity (to Risk-Weighted Assets)     28,190       17.79       ³7,132       ³4.5       ³10,301       ³6.5       ³11,094       ³7.0  
Tier 1 Capital (to Assets)     28,190       10.67       ³10,566       ³4.0       ³13,208       ³5.0       ³13,208       ³5.0