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Stockholders' Equity - Summary of capital comparison with minimum requirements (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Annual increase in capital (to risk weighted assets) for capital adequacy purposes ratio | 0.625% |  |
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Amount | $ 32,946 | $ 33,962 |
Common Equity Tier I Capital (to Risk Weighted Assets) Actual Ratio | 12.83% | 13.63% |
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Amount | $ 11,553 | $ 11,213 |
Common Equity Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Actual Ratio | 4.50% | 4.50% |
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Amount | $ 16,687 | $ 16,197 |
Common Equity Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Actual Ratio | 6.50% | 6.50% |
Total Capital (to Risk Weighted Assets) Actual Amount | $ 35,543 | $ 36,471 |
Total Capital (to Risk Weighted Assets) Actual Ratio | 13.84% | 14.64% |
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount | $ 20,538 | $ 19,935 |
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio | 8.00% | 8.00% | 0.625%
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 25,673 | $ 24,918 |
Total Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 10.00% | 10.00% |
Tier I Capital (to Risk Weighted Assets) Actual Amount | $ 32,946 | $ 33,962 |
Tier I Capital (to Risk Weighted Assets) Actual Ratio | 12.83% | 13.63% |
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Amount | $ 15,404 | $ 14,951 |
Tier I Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio | 6.00% | 6.00% |
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 20,538 | $ 19,935 |
Tier I Capital (to Risk Weighted Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 8.00% | 8.00% |
Tier I Capital (to Average Assets) Actual Amount | $ 32,928 | $ 33,962 |
Tier I Capital (to Average Assets) Actual Ratio | 8.43% | 8.68% |
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Amount | $ 15,617 | $ 15,659 |
Tier I Capital (to Average Assets) For Capital Adequacy Purposes Ratio | 4.00% | 4.00% |
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 19,521 | $ 19,574 |
Tier I Capital (to Average Assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 5.00% | 5.00% |
Minimum |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Total Capital (to Risk Weighted Assets) Actual Ratio | 8.00% |  |
Tier I Capital (to Risk Weighted Assets) Actual Ratio | 4.00% |  |
Tier I Capital (to Average Assets) Actual Ratio | 4.00% |  |
Maximum |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Total Capital (to Risk Weighted Assets) For Capital Adequacy Purposes Ratio | 2.50% |  |
Tier I Capital (to Risk Weighted Assets) Actual Ratio | 6.00% |  |

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