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Investment Securities (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value $ 96,306 $ 58,486
Less than 12 months, Unrealized Losses (2,271) (472)
12 months or longer, Fair Value 41,991 44,406
12 months or longer, Unrealized Losses (1,932) (1,231)
Total, Fair Value 138,297 102,892
Total, Unrealized Losses (4,203) (1,703)
U.S. Agency [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 4,684 5,923
Less than 12 months, Unrealized Losses (158) (39)
12 months or longer, Fair Value 1,846 399
12 months or longer, Unrealized Losses (80) (1)
Total, Fair Value 6,530 6,322
Total, Unrealized Losses (238) (40)
U.S. Agency mortgage-backed securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 53,287 36,783
Less than 12 months, Unrealized Losses (1,273) (253)
12 months or longer, Fair Value 18,095 22,625
12 months or longer, Unrealized Losses (780) (511)
Total, Fair Value 71,382 59,408
Total, Unrealized Losses (2,053) (764)
Municipal [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 19,815 8,657
Less than 12 months, Unrealized Losses (469) (109)
12 months or longer, Fair Value 9,465 7,727
12 months or longer, Unrealized Losses (602) (318)
Total, Fair Value 29,280 16,384
Total, Unrealized Losses (1,071) (427)
Corporate bonds and other securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 18,520 7,123
Less than 12 months, Unrealized Losses (371) (71)
12 months or longer, Fair Value 12,585 13,655
12 months or longer, Unrealized Losses (470) (401)
Total, Fair Value 31,105 20,778
Total, Unrealized Losses $ (841) $ (472)