Employee Benefit Plans (Assumed Benefit Obligations) (Details) (CommunityOne [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Integrity Financial Corporation [Member] | Former president of acquiree [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Benefit payments, payable period	10 years
Provision expense for future benefits	$ 39,000	$ 49,000	$ 26,000
Payments made under provisions of the non-qualifying deferred compensation plan	80,000	76,000	70,000
Integrity Financial Corporation [Member] | Former president of acquiree [Member] | Other liabilities [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Non-qualifying deferred compensation plan liability	300,000	400,000
Carolina Fincorp, Inc. [Member] | Retired executive of acquiree [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Benefit amount per year	$ 30,000
Benefit payments, payable period	10 years
Carolina Fincorp, Inc. [Member] | Retired executive of acquiree [Member] | Minimum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Expected lum sum cash distribution period after plan termination	1 year
Carolina Fincorp, Inc. [Member] | Retired executive of acquiree [Member] | Maximum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Expected lum sum cash distribution period after plan termination	2 years