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Investment Securities (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value    
Less than 12 months $ 184,887 $ 102,205
12 months or more 3,742 45,296
Total 188,629 147,501
Unrealized Losses    
Less than 12 months (3,237) (848)
12 months or more (147) (1,166)
Total (3,384) (2,014)
U.S. government and federal agency obligations    
Fair Value    
Less than 12 months 13,365  
12 months or more 0  
Total 13,365  
Unrealized Losses    
Less than 12 months (303)  
12 months or more 0  
Total (303)  
Government sponsored enterprises    
Fair Value    
Less than 12 months 29,432 43,539
12 months or more 0 1,002
Total 29,432 44,541
Unrealized Losses    
Less than 12 months (329) (222)
12 months or more 0 (13)
Total (329) (235)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 32,318 2,571
12 months or more 0 718
Total 32,318 3,289
Unrealized Losses    
Less than 12 months (757) (6)
12 months or more 0 (5)
Total (757) (11)
Mortgage-backed securities | Residential - government agencies    
Fair Value    
Less than 12 months 109,772 56,095
12 months or more 3,742 43,576
Total 113,514 99,671
Unrealized Losses    
Less than 12 months (1,848) (620)
12 months or more (147) (1,148)
Total $ (1,995) $ (1,768)