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Securities (Tables)
 9 Months Ended
Sep. 30, 2012
Investments debt and equity securities [Abstract]  
Available-for-sale Securities [Table Text Block]
  September 30, 2012
   1 year1 to 55 to 10After 10Fair Gross Unrealized  Amortized
(Dollars in thousands) or lessyearsyearsyearsValue GainsLosses Cost
Available-for-sale:            
Agency obligations (a)$—    —     10,113 24,503 34,616  247—     $ 34,369
Agency RMBS (a) —    —     4,986 132,627 137,613  4,077—       133,536
State and political subdivisions  112 1,706 19,464 60,687 81,969  5,486—       76,483
Trust preferred securities:            
 Individual issuer —    —    —     621 621  101 173   693
 Total available-for-sale$ 112 1,706 34,563 218,438 254,819  9,911 173 $ 245,081
(a) Includes securities issued by U.S. government agencies or government sponsored entities.

  December 31, 2011
   1 year1 to 55 to 10After 10Fair Gross Unrealized  Amortized
(Dollars in thousands) or lessyearsyearsyearsValue GainsLosses Cost
Available-for-sale:            
Agency obligations (a)$—    —     5,013 46,072 51,085  182 1 $ 50,904
Agency RMBS (a) —    —     14,935 149,863 164,798  2,534 129   162,393
State and political subdivisions —     414 17,761 63,538 81,713  4,339 48   77,422
Trust preferred securities:            
 Pooled —    —    —     100 100 —     130   230
 Individual issuer —    —    —     1,886 1,886 186    243   1,943
 Total available-for-sale$—     414 37,709 261,459 299,582  7,241 551 $ 292,892
(a) Includes securities issued by U.S. government agencies or government sponsored entities.
Available-for-sale Securities, Continuous Unrealized Loss Position [Table Text Block]
    Less than 12 Months  12 Months or Longer  Total
    Fair  Unrealized  Fair  Unrealized  Fair  Unrealized
(Dollars in thousands) Value  Losses  Value  Losses  Value  Losses
September 30, 2012:                 
Trust preferred securities:                 
 Individual issuer$—      —       327   173 $ 327   173
  Total $—      —       327   173 $ 327   173

                    
December 31, 2011:                 
Agency obligations $5,000  1  —      —     $ 5,000  1
Agency RMBS 17,020  129  —      —       17,020  129
State and political subdivisions 1,686  11  718  37   2,404  48
Trust preferred securities:                 
 Pooled —      —      100  130   100  130
 Individual issuer —      —      757  243   757  243
  Total $23,706  141  1,575  410 $25,281  551
Trust Preferred Securiities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
Trust Preferred Securities as ofSeptember 30, 2012
           Unrealized Losses  Life-to-date
    Credit Rating  Fair Less than 12 months    Impairment
(Dollars in thousands)Moody's Fitch  Value 12 months or Longer Total  Charges
Individual issuer (a):               
Carolina Financial Capital Trust In/an/a $ 294  —     —     —       257
TCB Trustn/an/a   327  —      173  173  —    
Total trust preferred securities   $ 621  —      173  173   257
n/a - not applicable, securities not rated.
(a) 144A Floating Rate Capital Securities. Issuers are individual community bank holding companies.

Trust Preferred Securities as of December 31, 2011
           Unrealized Losses  Life-to-date
    Credit Rating  Fair Less than 12 months    Impairment
(Dollars in thousands)  Moody's Fitch  Value 12 months or Longer Total  Charges
Pooled:               
ALESCO Preferred Funding XVII Ltd (a)CCC $ 100  —     130 130  1,770
Individual issuer (b):               
Carolina Financial Capital Trust In/an/a   193  —     —     —      257
Main Street Bank Statutory Trust I (c)n/an/a   389  —     111 111  —    
MNB Capital Trust In/an/a   55  —     —     —      445
PrimeSouth Capital Trust In/an/a   75  —     —     —      425
TCB Trustn/an/a   368  —     132 132  —    
United Community Capital Trustn/an/a   806  —     —     —      379
 Total individual issuer     1,886  —     243 243  1,506
Total trust preferred securities   $ 1,986  —     373 373  3,276
n/a - not applicable securities not rated.
(a) Class B Deferrable Third Priority Secured Floating Rate Notes. The underlying collateral is primarily composed of
  trust preferred securities issued by community banks and thrifts.
(b) 144A Floating Rate Capital Securities. Issuers are individual community bank holding companies.
(c) Now an obligation of BB&T Corporation.
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
    Quarter ended September 30,  Nine months ended September 30,
(Dollars in thousands) 2012  2011  2012  2011
Balance, beginning of period$ 1,257 $ 3,040 $ 3,276 $ 2,938
 Additions:           
  Subsequent credit impairments —       236   130   338
 Reductions:           
  Securities sold —      —       2,149  —    
Balance, end of period$ 1,257 $ 3,276 $ 1,257 $ 3,276
Available For Sale Securiites Changes In Other Than Temporary Impairment Losses [Table Text Block]
     Quarter ended September 30,  Nine months ended September 30,
(Dollars in thousands) 2012  2011  2012  2011
Other-than-temporary impairment charges            
 (included in earnings):           
 Debt securities:           
  Individual issuer trust preferred securities$—     $236   $ 130 $ 338
   Total debt securities —      236     130   338
Total other-than-temporary impairment charges$—     $236   $ 130 $ 338
Other-than-temporary impairment on debt securities:          
 Recorded as part of gross realized losses:           
  Credit-related$—      236   $ 130 $ 338
  Securities with intent to sell —      —      —      —    
  (Transferred from) recorded directly to other            
   comprehensive income for non-credit related           
   impairment —      (80)   —       130
Total other-than-temporary impairment on debt securities$—     $ 156 $ 130 $ 468
Schedule of Realized Gain (Loss) [Table Text Block]
Realized Gains and Losses
               
  The following table presents the gross realized gains and losses on sales and other-than-temporary impairment charges
related to securities, including cost-method investments.
               
     Quarter ended September 30,  Nine months ended September 30,
(Dollars in thousands)  2012  2011  2012  2011
Gross realized gains $ 203 $ 474 $ 927 $ 1,379
Gross realized losses   (25)   (23)   (189)   (478)
Other-than-temporary impairment charges  —       (236)   (130)   (338)
  Realized gains, net $ 178 $ 215 $ 608 $ 563