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Securities (Tables)
 6 Months Ended
Jun. 30, 2013
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
June 30, 2013            
Agency obligations (a)$ — — 24,001 22,614 46,615  22 2,480 $ 49,073
Agency RMBS (a)  — — 3,968 149,995 153,963  938 3,416   156,441
State and political subdivisions  — 1,846 20,149 47,527 69,522  2,341 309   67,490
Trust preferred securities  — — — 694 694  137 136   693
 Total available-for-sale$ — 1,846 48,118 220,830 270,794  3,438 6,341 $ 273,697

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
(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
June 30, 2013:                 
Agency obligations $41,593  2,480   —   — $41,593  2,480
Agency RMBS 108,049  3,416   —   —  108,049  3,416
State and political subdivisions 7,381  309   —   —  7,381  309
Trust preferred securities  —   —   364   136 $ 364   136
  Total $ 157,023   6,205   364   136 $ 157,387   6,341

                    
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 $35,519  335
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
    Quarter ended June 30,  Six months ended June 30,
(Dollars in thousands) 2013  2012  2013  2012
Balance, beginning of period$ 1,257 $ 1,257 $ 1,257 $ 3,276
 Additions:           
  Subsequent credit impairments  —   —   —   130
 Reductions:           
  Securities sold  —   —   —   2,149
  Securities fully written down and deemed worthless  500   —   500   —
Balance, end of period$ 757 $ 1,257 $ 757 $ 1,257
Available For Sale Securiites Changes In Other Than Temporary Impairment Losses [Table Text Block]
     Quarter ended June 30,  Six months ended June 30,
(Dollars in thousands) 2013  2012  2013  2012
Other-than-temporary impairment charges            
 (included in earnings):           
 Debt securities:           
  Individual issuer trust preferred securities$ — $ — $ — $ 130
   Total debt securities  —   —   —   130
Total other-than-temporary impairment charges$ — $ — $ — $ 130
Other-than-temporary impairment on debt securities:          
 Recorded as part of gross realized losses:           
  Credit-related$ — $ — $ — $ 130
Total other-than-temporary impairment on debt securities$ — $ — $ — $ 130
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.
               
     Quarter ended June 30,  Six months ended June 30,
(Dollars in thousands)  2013  2012  2013  2012
Gross realized gains $ 524 $ 251 $ 685 $ 724
Gross realized losses   (6)   —   (6)   (164)
Other-than-temporary impairment charges   —   —   —   (130)
  Realized gains, net $ 518 $ 251 $ 679 $ 430