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Investment Securities (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value $ 90,781 $ 58,486
Less than 12 months, Unrealized Losses (1,795) (472)
12 months or longer, Fair Value 40,391 44,406
12 months or longer, Unrealized Losses (1,616) (1,231)
Total, Fair Value 131,172 102,892
Total, Unrealized Losses (3,411) (1,703)
U.S. Agency [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 6,005 5,923
Less than 12 months, Unrealized Losses (165) (39)
12 months or longer, Fair Value 400 399
12 months or longer, Unrealized Losses (1) (1)
Total, Fair Value 6,405 6,322
Total, Unrealized Losses (166) (40)
U.S. Agency mortgage-backed securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 51,033 36,783
Less than 12 months, Unrealized Losses (985) (253)
12 months or longer, Fair Value 17,925 22,625
12 months or longer, Unrealized Losses (670) (511)
Total, Fair Value 68,958 59,408
Total, Unrealized Losses (1,655) (764)
Taxable Municipal [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 18,562 8,657
Less than 12 months, Unrealized Losses (412) (109)
12 months or longer, Fair Value 8,431 7,727
12 months or longer, Unrealized Losses (525) (318)
Total, Fair Value 26,993 16,384
Total, Unrealized Losses (937) (427)
Corporate bonds and other securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 15,181 7,123
Less than 12 months, Unrealized Losses (233) (71)
12 months or longer, Fair Value 13,635 13,655
12 months or longer, Unrealized Losses (420) (401)
Total, Fair Value 28,816 20,778
Total, Unrealized Losses $ (653) $ (472)