Shareholders' equity and regulatory matters (Details) - USD ($)
$ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
| Total capital (to risk-weighted assets), Amount [Abstract] |
|
|
| Actual Amount |
$ 43,368,000
|
$ 42,695,000
|
| For Capital Adequacy Purposes |
24,435,000
|
24,369,000
|
| Minimum Capital Adequacy with Capital buffer |
25,634,400
|
|
| To be Well Capitalized Amount |
$ 30,544,000
|
$ 30,461,000
|
| Total capital (to risk-weighted assets), Ratio [Abstract] |
|
|
| Actual Ratio (in percentage) |
14.20%
|
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 |
$ 39,757,000
|
$ 39,133,000
|
| For Capital Adequacy Purposes |
12,217,000
|
12,184,000
|
| Minimum Capital Adequacy with Capital buffer |
20,235,000
|
|
| To be Well Capitalized Amount |
$ 18,326,000
|
$ 18,277,000
|
| Tier 1 capital (to risk- weighted assets), Ratio [Abstract] |
|
|
| Actual Ratio (in percentage) |
13.02%
|
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 |
$ 39,757,000
|
$ 39,133,000
|
| For Capital Adequacy Purposes |
16,738,000
|
16,776,000
|
| To be Well Capitalized Amount |
$ 20,922,000
|
$ 20,970,000
|
| Leverage ratio (Tier 1 capital to average assets), Ratio [Abstract] |
|
|
| Actual Ratio (in percentage) |
9.50%
|
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 |
$ 39,757,000
|
$ 39,133,000
|
| For Capital Adequacy Purposes |
13,745,000
|
13,707,000
|
| Minimum Capital Adequacy with Capital buffer |
15,654,000
|
|
| To be Well Capitalized Amount |
$ 19,853,000
|
$ 15,231,000
|
| Common equity (Tier 1 risk based capital to risk weighted assets), Ratio [Abstract] |
|
|
| Actual Ratio (in percentage) |
13.02%
|
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%
|