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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2016
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, 2016                                
Government sponsored enterprises   $ 38,824     $ 140     $ 1       38,963  
Asset-backed securities     166,066       1,469       354       167,181  
Obligations of states and political subdivisions     28,351       661       2       29,010  
Total available-for-sale securities   $ 233,241     $ 2,270     $ 357     $ 235,154  
                                 
December 31, 2015                                
Government sponsored enterprises   $ 73,605     $ 127     $ 235     $ 73,497  
Asset-backed securities     130,179       440       1,768       128,851  
Obligations of states and political subdivisions     32,224       493       11       32,706  
Total available-for-sale securities   $ 236,008     $ 1,060     $ 2,014     $ 235,054  
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   $ 15,119     $ 15,127  
Due after one year through five years     41,357       41,771  
Due after five years through ten years     10,169       10,544  
Due after ten years     530       531  
Total     67,175       67,973  
Asset-backed securities     166,066       167,181  
Total available-for-sale securities   $ 233,241     $ 235,154  
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, 2016                                                
Government sponsored enterprises   $ 8,002     $ (1 )   $ 0     $ 0     $ 8,002     $ (1 )
Asset-backed securities     41,378       (244 )     11,197       (110 )     52,575       (354 )
Obligations of states and political subdivisions     540       (2 )     251       0       791       (2 )
Total   $ 49,920     $ (247 )   $ 11,448     $ (110 )   $ 61,368     $ (357 )
                                                 
(in thousands)                                                
At December 31, 2015                                                
Government sponsored enterprises   $ 43,539     $ (222 )   $ 1,002     $ (13 )   $ 44,541     $ (235 )
Asset-backed securities     56,095       (620 )     43,576       (1,148 )     99,671       (1,768 )
Obligations of states and political subdivisions     2,571       (6 )     718       (5 )     3,289       (11 )
Total   $ 102,205     $ (848 )   $ 45,296     $ (1,166 )   $ 147,501     $ (2,014 )
Schedule of components of investment securities gains (losses), which are recognized in earnings
 
    Three Months Ended June 30,     Six Months Ended June 30,  
(in thousands)   2016     2015     2016     2015  
Gains realized on sales   $ 18     $ 8     $ 490     $ 8  
Losses realized on sales     0       0       0       0  
Other-than-temporary impairment recognized     0       0       0       0  
Investment securities gains   $ 18     $ 8     $ 490     $ 8