Regulatory Matters, Capital Adequacy, and Liquidity (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Total capital (to risk-weighted assets)
Actual Amount	$ (17,003)	$ (6,525)
Ratio (as a percent)	(2.50%)	(0.80%)
Minimum Requirements for Capital Adequacy Purposes	55,433	67,262
Minimum Requirements for Capital Adequacy Purposes (as a percent)	8.00%	8.00%
To be Well Capitalized Under Prompt Corrective Action Provision	69,292	84,078
To be Well Capitalized Under Prompt Corrective Action Provision (as a percent)	10.00%	10.00%
Tier 1 capital (to risk-weighted assets)
Actual Amount	(17,003)	(6,525)
Ratio (as a percent)	(2.50%)	(0.80%)
Minimum Requirements for Capital Adequacy Purposes	27,717	33,631
Minimum Requirements for Capital Adequacy Purposes (as a percent)	4.00%	4.00%
To be Well Capitalized Under Prompt Corrective Action Provision	41,575	50,447
To be Well Capitalized Under Prompt Corrective Action Provision (as a percent)	6.00%	6.00%
Tier 1 Capital (to average quarterly assets)
Actual Amount	(17,003)	(6,525)
Ratio (as a percent)	(1.50%)	(0.50%)
Minimum Requirements for Capital Adequacy Purposes	46,257	52,932
Minimum Requirements for Capital Adequacy Purposes (as a percent)	4.00%	4.00%
To be Well Capitalized Under Prompt Corrective Action Provision	57,821	66,165
To be Well Capitalized Under Prompt Corrective Action Provision (as a percent)	5.00%	5.00%
Bank
Total capital (to risk-weighted assets)
Actual Amount	49,748	61,292
Ratio (as a percent)	7.20%	7.30%
Minimum Requirements for Capital Adequacy Purposes	55,276	67,073
Minimum Requirements for Capital Adequacy Purposes (as a percent)	8.00%	8.00%
To be Well Capitalized Under Prompt Corrective Action Provision	69,094	83,841
To be Well Capitalized Under Prompt Corrective Action Provision (as a percent)	10.00%	10.00%
Tier 1 capital (to risk-weighted assets)
Actual Amount	41,099	50,777
Ratio (as a percent)	5.90%	6.10%
Minimum Requirements for Capital Adequacy Purposes	27,638	33,536
Minimum Requirements for Capital Adequacy Purposes (as a percent)	4.00%	4.00%
To be Well Capitalized Under Prompt Corrective Action Provision	41,457	50,304
To be Well Capitalized Under Prompt Corrective Action Provision (as a percent)	6.00%	6.00%
Tier 1 Capital (to average quarterly assets)
Actual Amount	41,099	50,777
Ratio (as a percent)	3.60%	3.80%
Minimum Requirements for Capital Adequacy Purposes	46,303	52,873
Minimum Requirements for Capital Adequacy Purposes (as a percent)	4.00%	4.00%
To be Well Capitalized Under Prompt Corrective Action Provision	$ 57,879	$ 66,091
To be Well Capitalized Under Prompt Corrective Action Provision (as a percent)	5.00%	5.00%

FIRST MARINER BANCORP 10-Q