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Investment Securities (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value $ 93,576 $ 58,486
Less than 12 months, Unrealized Losses (2,486) (472)
12 months or longer, Fair Value 57,986 44,406
12 months or longer, Unrealized Losses (2,954) (1,231)
Total, Fair Value 151,562 102,892
Total, Unrealized Losses (5,440) (1,703)
U.S. Agency [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 2,734 5,923
Less than 12 months, Unrealized Losses (109) (39)
12 months or longer, Fair Value 3,689 399
12 months or longer, Unrealized Losses (199) (1)
Total, Fair Value 6,423 6,322
Total, Unrealized Losses (308) (40)
U.S. Agency mortgage-backed securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 49,544 36,783
Less than 12 months, Unrealized Losses (1,211) (253)
12 months or longer, Fair Value 29,471 22,625
12 months or longer, Unrealized Losses (1,353) (511)
Total, Fair Value 79,015 59,408
Total, Unrealized Losses (2,564) (764)
Municipal [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 19,978 8,657
Less than 12 months, Unrealized Losses (619) (109)
12 months or longer, Fair Value 11,847 7,727
12 months or longer, Unrealized Losses (826) (318)
Total, Fair Value 31,825 16,384
Total, Unrealized Losses (1,445) (427)
Corporate bonds and other securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 21,320 7,123
Less than 12 months, Unrealized Losses (547) (71)
12 months or longer, Fair Value 12,979 13,655
12 months or longer, Unrealized Losses (576) (401)
Total, Fair Value 34,299 20,778
Total, Unrealized Losses $ (1,123) $ (472)