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Securities (Tables)
 12 Months Ended
Dec. 31, 2012
Investments debt and equity securities [Abstract]  
Available-for-sale Securities [Table Text Block]
   1 year1 to 55 to 10After 10Fair Gross Unrealized  Amortized
(Dollars in thousands) or lessyearsyearsyearsValue GainsLosses Cost
December 31, 2012            
Agency obligations (a)$ — — 20,065 19,460 39,525  187 19 $ 39,357
Agency RMBS (a)  — — 4,700 136,760 141,460  3,012 162   138,610
State and political subdivisions 111    1,830 21,006 54,891 77,838  5,222 —   72,616
Trust preferred securities  — — — 652 652  113 154   693
 Total available-for-sale$111   1,830 45,771 211,763 259,475  8,534 335 $ 251,276

December 31, 2011            
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  — — — 1,986 1,986  186 373   2,173
 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
December 31, 2012:                 
Agency obligations $ 9,966   19   —   —   9,966 $ 19
Agency RMBS  25,207   162   —   —   25,207   162
Trust preferred securities  —   —   346   154   346   154
  Total $ 35,173   181   346   154   35,519 $ 335

                    
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  —   —  857  373  857  373
  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 ofDecember 31, 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   306   —  —  —   257
TCB Trustn/an/a   346   —  154  154   —
Total trust preferred securities   $ 652   —  154  154 $ 257
                   
n/a - not applicable securities not rated.
                   
(a) 144A Floating Rate Capital Securities. Underlying issuer is a community bank holding company. Securities have no
  excess subordination or overcollateralization.

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. Underlying issuer is a community bank holding company. Securities have no
  excess subordination or overcollateralization.
(c) Now an obligation of BB&T Corporation.
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
     Year ended December 31
(Dollars in thousands)  2012  2011  2010
Balance, beginning of period $ 3,276   2,938   4,570
 Additions:         
  Initial credit impairments   —   —   1,160
  Subsequent credit impairments   130   338   58
 Reductions:         
  Securities sold   (2,149)   —   (975)
  Securities fully written down and deemed worthless   —   —   (1,875)
Balance, end of period $ 1,257   3,276   2,938
Available For Sale Securiites Changes In Other Than Temporary Impairment Losses [Table Text Block]
      Year ended December 31
(Dollars in thousands)  2012  2011  2010
Other-than-temporary impairment charges (included in earnings):         
 Debt securities:         
  Corporate debt securities $ —   —   810
  Pooled trust preferred securities   —   —   50
  Individual issuer trust preferred securities   130   338   1,168
   Total debt securities $130  338  2,028
Total other-than-temporary impairment charges (included in earnings) $130  338  2,028
Other-than-temporary impairment on debt securities:         
 Recorded as part of gross realized losses:         
  Credit-related  130  338  1,218
  Securities with intent to sell   —   —  810
 Recorded directly to other comprehensive income for non-credit          
  related impairment   —  130  210
Total other-than-temporary impairment on debt securities $ 130   468   2,238
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.
           
    Year ended December 31
(Dollars in thousands)  2012  2011  2010
Gross realized gains $ 1,005   1,698   3,496
Gross realized losses   (196)   (482)   (45)
Other-than-temporary impairment charges   (130)   (338)   (2,028)
 Realized gains, net $ 679   878   1,423