Regulatory Capital Matters (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Regulatory capital matters
Number of classifications for prompt corrective action regulations | item	5
Capital conservation buffer (as a percent)	2.50%	1.87%
Tier one risk based minimum required capital conservation	2.50%
Citizens First Bank, Inc.
Total Capital (to Risk-Weighted Assets)
Actual, Amount	$ 56,359	$ 55,115
For Capital Adequacy Purposes, Amount	31,731	31,424
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 39,664	$ 39,280
Total Capital (to Risk-Weighted Assets)
Actual, Ratio (as a percent)	14.21%	14.03%
For Capital Adequacy Purposes, Ratio (as a percent)	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	10.00%	10.00%
Tier I Capital (to Risk-Weighted Assets)
Actual, Amount	$ 51,960	$ 50,742
For Capital Adequacy Purposes, Amount	23,798	23,568
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 31,731	$ 31,424
Tier I Capital (to Risk-Weighted Assets)
Actual, Ratio (as a percent)	13.10%	12.92%
For Capital Adequacy Purposes, Ratio (as a percent)	6.00%	6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	8.00%	8.00%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
Actual Amount	$ 51,960	$ 50,742
For Capital Adequacy Purposes, Amount	17,849	17,676
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 25,781	$ 25,532
Common Equity Tier 1 Capital (to Risk-Weighted Assets)
Actual, Ratio (as a percent)	13.10%	12.92%
For Capital Adequacy Purposes, Ratio (as a percent)	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	6.50%	6.50%
Tier I Leverage Capital to Average Assets
Actual, Amount	$ 51,960	$ 50,742
For Capital Adequacy Purposes, Amount	18,606	18,764
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 23,257	$ 23,455
Tier I Capital (to Average Assets)
Actual, Ratio (as a percent)	11.17%	10.82%
For Capital Adequacy Purposes, Ratio (as a percent)	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio (as a percent)	5.00%	5.00%