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12. Regulatory Matters (Tables)
12 Months Ended
Dec. 31, 2016
Banking and Thrift [Abstract]  
Bank's actual capital amounts and ratios
(Dollars in thousands)                      
  Actual  

For Capital

Adequacy Purposes

 

To Be Well

Capitalized Under

Prompt Corrective

Action Provisions

                       
  Amount   Ratio   Amount   Ratio   Amount   Ratio
                       
As of December 31, 2016:                      
                       
Total Capital (to Risk-Weighted Assets)                      
Consolidated $ 131,991   16.12%   65,508   8.00%   N/A   N/A
Bank $ 129,035   15.78%   65,426   8.00%   81,782   10.00%
Tier 1 Capital (to Risk-Weighted Assets)                        
Consolidated $ 124,441   15.20%   49,131   6.00%   N/A   N/A
Bank $ 121,485   14.85%   49,069   6.00%   65,426   8.00%
Tier 1 Capital (to Average Assets)                        
Consolidated $ 124,441   11.19%   44,488   4.00%   N/A   N/A
Bank $ 121,485   10.88%   44,677   4.00%   55,846   5.00%
Common Equity Tier 1 (to Risk-Weighted Assets)                        
Consolidated $ 104,441   12.75%   36,848   4.50%   N/A   N/A
Bank $ 121,485   14.85%   36,802   4.50%   53,158   6.50%
                         
As of December 31, 2015:                        
                         
Total Capital (to Risk-Weighted Assets)                        
Consolidated $ 129,203   16.63%   62,137   8.00%   N/A   N/A
Bank $ 124,910   16.11%   62,026   8.00%   77,532   10.00%
Tier 1 Capital (to Risk-Weighted Assets)                        
Consolidated $ 119,354   15.37%   46,603   6.00%   N/A   N/A
Bank $ 115,160   14.85%   46,519   6.00%   62,026   8.00%
Tier 1 Capital (to Average Assets)                        
Consolidated $ 119,354   11.44%   41,743   4.00%   N/A   N/A
Bank $ 115,160   11.03%   41,776   4.00%   52,220   5.00%
Common Equity Tier 1 (to Risk-Weighted Assets)                        
Consolidated $ 99,354   12.79%   34,952   4.50%   N/A   N/A
Bank $ 115,160   14.85%   34,890   4.50%   50,396   6.50%