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Investment Securities (Tables)
6 Months Ended
Jun. 30, 2018
Investments Debt And Equity Securities [Abstract]  
Schedule of amortized cost and fair value of debt securities available-for-sale
    Total                    
    Amortized     Gross Unrealized     Fair  
(in thousands)   Cost     Gains     Losses     Value  
June 30, 2018                                
U.S. Treasury   $ 1,983     $ 0     $ (53 )   $ 1,930  
U.S. government and federal agency obligations     11,443       0       (351 )     11,092  
Government sponsored enterprises     46,773       4       (718 )     46,059  
Obligations of states and political subdivisions     42,054       38       (633 )     41,459  
Mortgage-backed securities:                                
Residential - government agencies     131,243       35       (4,217 )     127,061  
Total available-for-sale securities   $ 233,496     $ 77     $ (5,972 )   $ 227,601  
                                 
December 31, 2017                                
U.S. Treasury   $ 1,980     $ 0     $ (13 )   $ 1,967  
U.S. government and federal agency obligations     12,341       0       (268 )     12,073  
Government sponsored enterprises     37,321       0       (424 )     36,897  
Obligations of states and political subdivisions     47,019       114       (477 )     46,656  
Mortgage-backed securities:                                
Residential - government agencies     131,045       44       (2,140 )     128,949  
Total available-for-sale securities   $ 229,706     $ 158     $ (3,322 )   $ 226,542  
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   $ 12,173     $ 12,120  
Due after one year through five years     68,835       68,187  
Due after five years through ten years     18,243       17,287  
Due after ten years     3,002       2,946  
Total     102,253       100,540  
Mortgage-backed securities     131,243       127,061  
Total available-for-sale securities   $ 233,496     $ 227,601  
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, 2018                                    
U.S. Treasury   $ 1,930     $ (53 )   $ 0     $ 0     $ 1,930     $ (53 )
U.S. government and federal agency obligations     0       0       11,092       (351 )     11,092       (351 )
Government sponsored enterprises     17,776       (260 )     25,333       (458 )     43,109       (718 )
Obligations of states and political subdivisions     22,974       (228 )     12,371       (405 )     35,345       (633 )
Mortgage-backed securities:                                                
Residential - government agencies     55,223       (1,367 )     65,303       (2,850 )     120,526       (4,217 )
 Total   $ 97,903     $ (1,908 )   $ 114,099     $ (4,064 )   $ 212,002     $ (5,972 )
                                                 
(in thousands)                                                
At December 31, 2017                                                
U.S. Treasury   $ 1,967     $ (13 )   $ 0     $ 0     $ 1,967     $ (13 )
U.S. government and federal agency obligations     0       0       12,073       (268 )     12,073       (268 )
Government sponsored enterprises     16,471       (119 )     20,426       (305 )     36,897       (424 )
Obligations of states and political subdivisions     22,013       (165 )     12,570       (312 )     34,583       (477 )
Mortgage-backed securities:                                                
Residential - government agencies     52,829       (488 )     69,580       (1,652 )     122,409       (2,140 )
 Total   $ 93,280     $ (785 )   $ 114,649     $ (2,537 )   $ 207,929     $ (3,322 )
Schedule of components of investment securities gains and losses
    Three Months Ended June 30,     Six Months Ended June 30,  
(in thousands)   2018     2017     2018     2017  
Gains realized on sales   $ 108     $ 0     $ 206     $ 0  
Losses realized on sales     0       0       0       0  
Other-than-temporary impairment recognized     0       0       0       0  
Investment securities gains   $ 108     $ 0     $ 206     $ 0