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Investment Securities (Tables)
3 Months Ended
Mar. 31, 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  
March 31, 2015                                
Government sponsored enterprises   $ 71,723     $ 376     $ 87       72,012  
Asset-backed securities     127,909       1,114       879       128,144  
Obligations of states and political subdivisions     34,199       652       50       34,801  
                                 
Total available-for-sale securities   $ 233,831     $ 2,142     $ 1,016     $ 234,957  
                                 
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   $ 14,523     $ 14,630  
Due after one year through five years     72,089       72,506  
Due after five years through ten years     18,677       19,048  
Due after ten years     633       629  
Total     105,922       106,813  
Asset-backed securities     127,909       128,144  
Total available-for-sale securities   $ 233,831     $ 234,957  
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 March 31, 2015                                                
Government sponsored enterprises   $ 14,095     $ (46 )   $ 8,959     $ (41 )   $ 23,054     $ (87 )
Asset-backed securities     28,517       (149 )     37,576       (730 )     66,093       (879 )
Obligations of states and political subdivisions     4,116       (30 )     482       (20 )     4,598       (50 )
Total   $ 46,728     $ (225 )   $ 47,017     $ (791 )   $ 93,745     $ (1,016 )
                                                 
(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 )