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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2015
Investments Debt And Equity Securities Abstract  
Schedule of amortized cost and fair value of debt securities classified as available-for-sale
          Gross     Gross        
    Amortized     Unrealized     Unrealized        
(in thousands)   Cost     Gains     Losses     Fair value  
June 30, 2015                                
Government sponsored enterprises   $ 76,667     $ 287     $ 110       76,844  
Asset-backed securities     129,205       746       1,533       128,418  
Obligations of states and political subdivisions     33,869       450       94       34,225  
Total available-for-sale securities   $ 239,741     $ 1,483     $ 1,737     $ 239,487  
                                 
December 31, 2014                                
Government sponsored enterprises   $ 57,002     $ 240     $ 143       57,099  
Asset-backed securities     106,726       855       1,119       106,462  
Obligations of states and political subdivisions     34,925       583       71       35,437  
Total available-for-sale securities   $ 198,653     $ 1,678     $ 1,333     $ 198,998  
Schedule of amortized cost and fair value of debt securities classified as available-for-sale by contractual maturity
    Amortized     Fair  
(in thousands)   Cost     Value  
Due in one year or less   $ 17,500     $ 17,591  
Due after one year through five years     78,174       78,453  
Due after five years through ten years     14,023       14,198  
Due after ten years     839       827  
Total     110,536       111,069  
Asset-backed securities     129,205       128,418  
Total available-for-sale securities   $ 239,741     $ 239,487  
Schedule of gross unrealized losses on debt securities and fair value of related securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
     Less than 12 months      12 months or more      Total      Total  
     Fair      Unrealized      Fair      Unrealized      Fair      Unrealized  
(in thousands)    Value      Losses      Value      Losses      Value      Losses  
At June 30, 2015                                                
Government sponsored                                                
 enterprises   $ 30,032     $ (100 )   $ 3,990     $ (10 )   $ 34,022     $ (110 )
Asset-backed securities     48,526       (498 )     36,908       (1,035 )     85,434       (1,533 )
Obligations of states and                                                
 political subdivisions     8,289       (81 )     489       (13 )     8,778       (94 )
 Total   $ 86,847     $ (679 )   $ 41,387     $ (1,058 )   $ 128,234     $ (1,737 )
                                                 
(in thousands)                                                
At December 31, 2014                                                
Government sponsored                                                
 enterprises   $ 2,983     $ (4 )   $ 17,862     $ (139 )   $ 20,845     $ (143 )
Asset-backed securities     10,314       (50 )     45,445       (1,069 )     55,759       (1,119 )
Obligations of states and                                                
 political subdivisions     3,667       (15 )     1,942       (56 )     5,609       (71 )
 Total   $ 16,964     $ (69 )   $ 65,249     $ (1,264 )   $ 82,213     $ (1,333 )
schedule of components of investment securities gains and losses
    Three Months Ended June 30,     Six Months Ended June 30,  
(in thousands)   2015     2014     2015     2014  
Gains realized on sales   $ 8     $ 0     $ 8     $ 0  
Losses realized on sales     0       0       0       0  
Other-than-temporary impairment recognized     0       0       0       0  
Investment securities gains   $ 8     $ 0     $ 8     $ 0