Securities Trust Preferred Continuous Unrealized Loss (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Trust Preferred Securities, Continuous Unrealized Loss Position, Fair Value [Member]
Pooled:
ALESCO Preferred Funding XVII LTD		$ 100
Individual Issuer [Abstract]
Carolina Financial Capital Trust I	294	193
Main Street Bank Statutory Trust I		389
MNB Capital Trust I		55
PrimeSouth Capital Trust I		75
TCB Trust	327	368
United Community Capital Trust		806
Individual Issuer		1,886
Trust Preferred Securities	621	1,986
Trust Preferred Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses [Member]
Pooled:
ALESCO Preferred Funding XVII LTD		0
Individual Issuer [Abstract]
Carolina Financial Capital Trust I	0	0
Main Street Bank Statutory Trust I		0
MNB Capital Trust I		0
PrimeSouth Capital Trust I		0
TCB Trust	0	0
United Community Capital Trust		0
Individual Issuer		0
Trust Preferred Securities	0	0
Trust Preferred Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses [Member]
Pooled:
ALESCO Preferred Funding XVII LTD		130
Individual Issuer [Abstract]
Carolina Financial Capital Trust I	0	0
Main Street Bank Statutory Trust I		111
MNB Capital Trust I		0
PrimeSouth Capital Trust I		0
TCB Trust	173	132
United Community Capital Trust		0
Individual Issuer		243
Trust Preferred Securities	173	373
Trust Preferred Securities, Continuous Unrealized Loss Position, Aggregate Losses [Member]
Pooled:
ALESCO Preferred Funding XVII LTD		130
Individual Issuer [Abstract]
Carolina Financial Capital Trust I	0	0
Main Street Bank Statutory Trust I		111
PrimeSouth Capital Trust I		0
TCB Trust	173	132
United Community Capital Trust		0
Individual Issuer		243
Trust Preferred Securities	173	373
Trust Preferred Securities, Continuous Unrealized Loss Position, Life to Date Impairment [Member]
Pooled:
ALESCO Preferred Funding XVII LTD		1,770
Individual Issuer [Abstract]
Carolina Financial Capital Trust I	257	257
Main Street Bank Statutory Trust I		0
MNB Capital Trust I		445
PrimeSouth Capital Trust I		425
TCB Trust	0	0
United Community Capital Trust		379
Individual Issuer		1,506
Trust Preferred Securities	$ 257	$ 3,276