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Investment Securities (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 months $ 76,235 $ 184,887
12 months or more 92,298 3,742
Total 168,533 188,629
Unrealized Losses    
Less than 12 months (445) (3,237)
12 months or more (1,485) (147)
Total (1,930) (3,384)
U.S. government and federal agency obligations    
Fair Value    
Less than 12 months 486 13,365
12 months or more 11,987 0
Total 12,473 13,365
Unrealized Losses    
Less than 12 months 0 (303)
12 months or more (180) 0
Total (180) (303)
Government sponsored enterprises    
Fair Value    
Less than 12 months 16,278 29,432
12 months or more 16,041 0
Total 32,319 29,432
Unrealized Losses    
Less than 12 months (69) (329)
12 months or more (166) 0
Total (235) (329)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 10,820 32,318
12 months or more 12,535 0
Total 23,355 32,318
Unrealized Losses    
Less than 12 months (35) (757)
12 months or more (215) 0
Total (250) (757)
Mortgage-backed securities | Residential - government agencies    
Fair Value    
Less than 12 months 48,651 109,772
12 months or more 51,735 3,742
Total 100,386 113,514
Unrealized Losses    
Less than 12 months (341) (1,848)
12 months or more (924) (147)
Total $ (1,265) $ (1,995)