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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2014
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  
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  
                                 
December 31, 2013                                
U.S. Treasury   $ 1,000     $ 3     $ 0     $ 1,003  
Government sponsored enterprises     61,006       377       767       60,616  
Asset-backed securities     112,747       817       3,191       110,373  
Obligations of states and political subdivisions     33,637       568       212       33,993  
Total available for sale securities   $ 208,390     $ 1,765     $ 4,170     $ 205,985  
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   $ 12,322     $ 12,421  
Due after one year through five years     56,138       56,327  
Due after five years through ten years     21,409       21,767  
Due after ten years     2,058       2,021  
Total     91,927       92,536  
Asset-backed securities     106,726       106,462  
Total available for sale securities   $ 198,653     $ 198,998  
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 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 )
                                                 
(in thousands)                                                
At December 31, 2013                                                
Government sponsored enterprises   $ 25,771     $ (767 )   $ 0     $ 0     $ 25,771     $ (767 )
Asset-backed securities     76,048       (2,940 )     5,941       (251 )     81,989       (3,191 )
Obligations of states and political subdivisions     6,907       (159 )     450       (53 )     7,357       (212 )
 Total   $ 108,726     $ (3,866 )   $ 6,391     $ (304 )   $ 115,117     $ (4,170 )
Schedule of components of investment securities gains (losses), which are recognized in earnings
(in thousands)   2014     2013     2012  
Gains realized on sales   $ 86     $ 786     $ 26  
Losses realized on sales     (66 )     (8 )     0  
Other-than-temporary impairment recognized     0       0       0  
Investment securities gains   $ 20     $ 778     $ 26