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Investment Securities (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 months $ 140,992 $ 184,887
12 months or more 29,498 3,742
Total 170,490 188,629
Unrealized Losses    
Less than 12 months (1,550) (3,237)
12 months or more (552) (147)
Total (2,102) (3,384)
U.S. government and federal agency obligations    
Fair Value    
Less than 12 months 7,788 13,365
12 months or more 4,925 0
Total 12,713 13,365
Unrealized Losses    
Less than 12 months (133) (303)
12 months or more (100) 0
Total (233) (303)
Government sponsored enterprises    
Fair Value    
Less than 12 months 32,339 29,432
12 months or more 2,473 0
Total 34,812 29,432
Unrealized Losses    
Less than 12 months (229) (329)
12 months or more (27) 0
Total (256) (329)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 22,886 32,318
12 months or more 1,912 0
Total 24,798 32,318
Unrealized Losses    
Less than 12 months (264) (757)
12 months or more (34) 0
Total (298) (757)
Mortgage-backed securities | Residential - government agencies    
Fair Value    
Less than 12 months 77,979 109,772
12 months or more 20,188 3,742
Total 98,167 113,514
Unrealized Losses    
Less than 12 months (924) (1,848)
12 months or more (391) (147)
Total $ (1,315) $ (1,995)