Regulatory Capital Requirements and Dividend Restrictions - Summary of Actual and Required Capital Ratios (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
The Palmetto Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual amount	$ 112,240	$ 115,985
Tier 1 capital to risk-weighted assets, Actual amount	101,990	104,972
Tier 1 leverage ratio, Actual amount	101,990	104,972
Total capital to risk-weighted assets, Actual ratio	13.83%	13.39%
Tier 1 capital to risk-weighted assets, Actual ratio	12.57%	12.12%
Tier 1 leverage ratio, Actual ratio	8.94%	8.52%
Total capital to risk-weighted assets, For capital adequacy purposes amount	64,918	69,285
Tier 1 capital to risk-weighted assets, For capital adequacy purposes amount	32,459	34,643
Tier 1 leverage ratio, For capital adequacy purposes amount	45,642	49,271
Total capital to risk-weighted assets, For capital adequacy purposes ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets, For capital adequacy purposes ratio	4.00%	4.00%
Tier 1 leverage ratio, For capital adequacy purposes ratio	4.00%	4.00%
Total capital to risk-weighted assets, To be well capitalized under prompt corrective action provisions ratio	81,148	86,607
Tier 1 capital to risk-weighted assets, To be well capitalized under prompt corrective action provisions amount	48,689	51,964
Tier 1 leverage ratio, To be well capitalized under prompt corrective action provisions amount	57,053	61,589
Total capital to risk-weighted assets, To be well capitalized under prompt corrective action provisions ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets, To be well capitalized under prompt corrective action provisions ratio	6.00%	6.00%
Tier 1 leverage ratio, To be well capitalized under prompt corrective action provisions ratio	5.00%	5.00%
Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital to risk-weighted assets, Actual amount	112,381	116,864
Tier 1 capital to risk-weighted assets, Actual amount	102,131	105,852
Tier 1 leverage ratio, Actual amount	102,131	105,852
Total capital to risk-weighted assets, Actual ratio	13.85%	13.49%
Tier 1 capital to risk-weighted assets, Actual ratio	12.59%	12.22%
Tier 1 leverage ratio, Actual ratio	8.95%	8.59%
Total capital to risk-weighted assets, For capital adequacy purposes amount	64,919	69,280
Tier 1 capital to risk-weighted assets, For capital adequacy purposes amount	32,460	34,640
Tier 1 leverage ratio, For capital adequacy purposes amount	$ 45,643	$ 49,270
Total capital to risk-weighted assets, For capital adequacy purposes ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets, For capital adequacy purposes ratio	4.00%	4.00%
Tier 1 leverage ratio, For capital adequacy purposes ratio	4.00%	4.00%