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Investment Securities (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value $ 66,255 $ 83,997
Less than 12 months, Unrealized Losses (936) (1,797)
12 months or longer, Fair Value 16,075 8,338
12 months or longer, Unrealized Losses (505) (299)
Total, Fair Value 82,330 92,335
Total, Unrealized Losses (1,441) (2,096)
U.S. Agency [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 3,990 398
Less than 12 months, Unrealized Losses (33) (2)
12 months or longer, Fair Value 399 0
12 months or longer, Unrealized Losses (1) 0
Total, Fair Value 4,389 398
Total, Unrealized Losses (34) (2)
U.S. Agency mortgage-backed securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 38,127 49,918
Less than 12 months, Unrealized Losses (321) (703)
12 months or longer, Fair Value 3,239 1,576
12 months or longer, Unrealized Losses (84) (62)
Total, Fair Value 41,366 51,494
Total, Unrealized Losses (405) (765)
Taxable Municipal [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 11,724 13,301
Less than 12 months, Unrealized Losses (377) (522)
12 months or longer, Fair Value 2,172 0
12 months or longer, Unrealized Losses (103) 0
Total, Fair Value 13,896 13,301
Total, Unrealized Losses (480) (522)
Corporate bonds and other securities [Member]    
Information concerning investments with unrealized losses    
Less than 12 months, Fair Value 12,414 20,380
Less than 12 months, Unrealized Losses (205) (570)
12 months or longer, Fair Value 10,265 6,762
12 months or longer, Unrealized Losses (317) (237)
Total, Fair Value 22,679 27,142
Total, Unrealized Losses $ (522) $ (807)