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Investment Securities (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value    
Less than 12 months $ 152,171 $ 184,887
12 months or more 28,626 3,742
Total 180,797 188,629
Unrealized Losses    
Less than 12 months (2,396) (3,237)
12 months or more (556) (147)
Total (2,952) (3,384)
U.S. government and federal agency obligations    
Fair Value    
Less than 12 months 8,362 13,365
12 months or more 4,909 0
Total 13,271 13,365
Unrealized Losses    
Less than 12 months (168) (303)
12 months or more (121) 0
Total (289) (303)
Government sponsored enterprises    
Fair Value    
Less than 12 months 34,190 29,432
12 months or more 0 0
Total 34,190 29,432
Unrealized Losses    
Less than 12 months (331) (329)
12 months or more 0 0
Total (331) (329)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 28,205 32,318
12 months or more 0 0
Total 28,205 32,318
Unrealized Losses    
Less than 12 months (516) (757)
12 months or more 0 0
Total (516) (757)
Mortgage-backed securities | Residential - government agencies    
Fair Value    
Less than 12 months 81,414 109,772
12 months or more 23,717 3,742
Total 105,131 113,514
Unrealized Losses    
Less than 12 months (1,381) (1,848)
12 months or more (435) (147)
Total $ (1,816) $ (1,995)