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Shareholders' equity and regulatory matters (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Total capital (to risk-weighted assets), Amount [Abstract]    
Actual Amount $ 48,207 $ 42,695
For Capital Adequacy Purposes 25,169 24,369
Minimum Capital Adequacy with Capital buffer 27,136  
To be Well Capitalized Amount $ 31,462 $ 30,461
Total capital (to risk-weighted assets), Ratio [Abstract]    
Actual Ratio (in percentage) 15.32% 14.02%
For Capital Adequacy Purposes (in percentage) 8.00% 8.00%
Minimum Capital Adequacy with Capital buffer (in percentage) 8.625%  
To be Well Capitalized (in percentage) 10.00% 10.00%
Tier 1 capital (to risk- weighted assets), Amount [Abstract]    
Actual Amount $ 44,788 $ 39,133
For Capital Adequacy Purposes 12,585 12,184
Minimum Capital Adequacy with Capital buffer 20,844  
To be Well Capitalized Amount $ 18,877 $ 18,277
Tier 1 capital (to risk- weighted assets), Ratio [Abstract]    
Actual Ratio (in percentage) 14.24% 12.85%
For Capital Adequacy Purposes (in percentage) 4.00% 4.00%
Minimum Capital Adequacy with Capital buffer (in percentage) 6.625%  
To be Well Capitalized (in percentage) 6.00% 6.00%
Leverage ratio (Tier 1 capital to average assets), Amount [Abstract]    
Actual Amount $ 44,788 $ 39,133
For Capital Adequacy Purposes 16,885 16,776
To be Well Capitalized Amount $ 21,106 $ 20,970
Leverage ratio (Tier 1 capital to average assets), Ratio [Abstract]    
Actual Ratio (in percentage) 10.64% 9.33%
For Capital Adequacy Purposes (in percentage) 4.00% 4.00%
To be Well Capitalized (in percentage) 5.00% 5.00%
Common equity (Tier 1 risk based capital to risk weighted assets), Amount [Abstract]    
Actual Amount $ 44,788 $ 39,133
For Capital Adequacy Purposes 14,291 13,707
Minimum Capital Adequacy with Capital buffer 16,275  
To be Well Capitalized Amount $ 20,642 $ 15,231
Common equity (Tier 1 risk based capital to risk weighted assets), Ratio [Abstract]    
Actual Ratio (in percentage) 14.24% 12.85%
For Capital Adequacy Purposes (in percentage) 4.50% 4.50%
Minimum Capital Adequacy with Capital buffer (in percentage) 5.125%  
To be Well Capitalized (in percentage) 6.50% 6.50%