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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

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