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Securities (Tables)
 9 Months Ended
Sep. 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
September 30, 2013            
Agency obligations (a)$ — — 23,744 22,079 45,823  — 3,253 $ 49,076
Agency RMBS (a)  — — 3,679 142,311 145,990  1,196 3,179   147,973
State and political subdivisions  — 2,096 19,739 45,077 66,912  1,998 399   65,313
Trust preferred securities  — — — 742 742  164 115   693
 Total available-for-sale$ — 2,096 47,162 210,209 259,467  3,358 6,946 $ 263,055

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
September 30, 2013:                 
Agency obligations $45,822  3,253   —   — $45,822  3,253
Agency RMBS 95,325  3,179   —   —  95,325  3,179
State and political subdivisions 7,751  399   —   —  7,751  399
Trust preferred securities  —   —   385   115 $ 385   115
  Total $ 148,898   6,831   385   115 $ 149,283   6,946

                    
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 $35,519  335
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
    Quarter ended September 30,  Nine months ended September 30,
(Dollars in thousands) 2013  2012  2013  2012
Balance, beginning of period$ 757 $ 1,257 $ 1,257 $ 3,276
 Additions:           
  Subsequent credit impairments  —   —   —   130
 Reductions:           
  Securities sold  —   —   —   2,149
  Securities fully written down and deemed worthless  —   —   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 September 30,  Nine months ended September 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 September 30,  Nine months ended September 30,
(Dollars in thousands)  2013  2012  2013  2012
Gross realized gains $ — $ 203 $ 685 $ 927
Gross realized losses   —   (25)   (6)   (189)
Other-than-temporary impairment charges   —   —   —   (130)
  Realized gains, net $ — $ 178 $ 679 $ 608