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Investment Securities (Tables)
9 Months Ended
Sep. 30, 2016
Investments Debt And Equity Securities [Abstract]  
Schedule of amortized cost, contractual maturity, gross unrealized gains and losses, and fair value of debt securities classified as available-for-sale
    Maturity*                          
                            Total                    
    1 Year     1-5     5-10     After     Amortized     Gross Unrealized     Fair  
(in thousands)   or Less     Years     Years     10 Years     Cost     Gains     Losses     Value  
September 30, 2016                                                                
U.S. government and federal agency obligations   $ 0     $ 0     $ 10,954     $ 2,494     $ 13,448     $ 13     $ (121 )   $ 13,340  
Government sponsored enterprises     3,010       30,595       0       0       33,605       82       (10 )     33,677  
Obligations of states and political subdivisions     2,315       16,672       16,112       1,332       36,431       436       (100 )     36,767  
Mortgage-backed securities:                                                                
Residential - government agencies     1,040       115,679       17,789       1,516       136,024       1,159       (159 )     137,024  
Commercial - government agencies     0       988       0       0       988       28       0       1,016  
Total mortgage-backed securities     1,040       116,667       17,789       1,516       137,012       1,187       (159 )     138,040  
Total available-for-sale securities   $ 6,365     $ 163,934     $ 44,855     $ 5,342     $ 220,496     $ 1,718     $ (390 )   $ 221,824  
                                                                 
December 31, 2015                                                                
Government sponsored enterprises   $ 23,067     $ 50,538     $ 0     $ 0     $ 73,605     $ 127     $ (235 )   $ 73,497  
Obligations of states and political subdivisions     1,827       16,975       12,593       829       32,224       493       (11 )     32,706  
Mortgage-backed securities:                                                                
Residential - government agencies     1,508       106,648       19,291       1,746       129,193       432       (1,768 )     127,857  
Commercial - government agencies     0       986       0       0       986       8       0       994  
Total mortgage-backed securities     1,508       107,634       19,291       1,746       130,179       440       (1,768 )     128,851  
Total available-for-sale securities   $ 26,402     $ 175,147     $ 31,884     $ 2,575     $ 236,008     $ 1,060     $ (2,014 )   $ 235,054  

 

* Expected maturities may differ from contractual maturities because borrowers have the right to call or prepay obligations with or without prepayment penalties.

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 September 30, 2016                                                
U.S. government and federal agency obligations   $ 11,827     $ (121 )   $ 0     $ 0     $ 11,827     $ (121 )
Government sponsored enterprises     9,001       (10 )     0       0       9,001       (10 )
Obligations of states and political subdivisions     15,202       (100 )     0       0       15,202       (100 )
Mortgage-backed securities:                                                
Residential - government agencies     31,631       (109 )     3,376       (50 )     35,007       (159 )
Total   $ 67,661     $ (340 )   $ 3,376     $ (50 )   $ 71,037     $ (390 )
                                                 
(in thousands)                                                
At December 31, 2015                                                
Government sponsored enterprises   $ 43,539     $ (222 )   $ 1,002     $ (13 )   $ 44,541     $ (235 )
Obligations of states and political subdivisions     2,571       (6 )     718       (5 )     3,289       (11 )
Mortgage-backed securities:                                                
Residential - government agencies     56,095       (620 )     43,576       (1,148 )     99,671       (1,768 )
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 September 30,     Nine Months Ended September 30,  
(in thousands)   2016     2015     2016     2015  
Gains realized on sales   $ 133     $ 0     $ 623     $ 8  
Losses realized on sales     (21 )     0       (21 )     0  
Other-than-temporary impairment recognized     0       0       0       0  
Investment securities gains   $ 112     $ 0     $ 602     $ 8