Regulatory Matters (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Consolidated [Member]
Actual capital amounts and ratios of the Bank
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 270,264	$ 258,871
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.36%	13.94%
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	150,581	148,529
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.00%	8.00%
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	246,450	235,349
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	13.09%	12.68%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	75,291	74,265
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount
Tier 1 Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio
Tier 1 Capital (to Average Assets), Actual, Amount	246,450	235,349
Tier 1 Capital (to Average Assets), Actual, Ratio	9.85%	9.46%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	100,087	99,563
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Tier 1 Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount
Tier 1 Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio
Tri Counties Bank [Member]
Actual capital amounts and ratios of the Bank
Total Capital (to Risk Weighted Assets), Actual, Amount	267,952	258,425
Total Capital (to Risk Weighted Assets), Actual, Ratio	14.25%	13.93%
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	150,481	148,429
Total Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	8.00%	8.00%
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	188,101	185,536
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	1.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets), Actual, Amount	244,153	234,919
Tier 1 Capital (to Risk Weighted Assets), Actual, Ratio	12.98%	12.66%
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Amount	75,240	74,214
Tier 1 Capital (to Risk Weighted Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	112,861	111,322
Tier 1 Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.00%	6.00%
Tier 1 Capital (to Average Assets), Actual, Amount	244,153	234,919
Tier 1 Capital (to Average Assets), Actual, Ratio	9.76%	9.44%
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Amount	100,035	99,511
Tier 1 Capital (to Average Assets), Minimum Capital Requirement, Ratio	4.00%	4.00%
Tier 1 Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 125,043	$ 124,389
Tier 1 Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%