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Investments (Details 1)
$ in Thousands
Sep. 30, 2016
USD ($)
Number
Dec. 31, 2015
USD ($)
Number
Schedule of Available-for-sale Securities [Line Items]    
No. of securities | Number 102 212
Fair value, Less than 12 months $ 45,142 $ 106,304
Unrealized losses, Less than 12 months (230) (877)
Fair value, 12 months or longer 0 12,101
Unrealized losses, 12 months or longer 0 (198)
Total, Fair value 45,142 118,405
Total, Unrealized losses $ (230) $ (1,075)
U. S. treasury securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
No. of securities | Number   2
Fair value, Less than 12 months   $ 3,542
Unrealized losses, Less than 12 months   (1)
Fair value, 12 months or longer   0
Unrealized losses, 12 months or longer   0
Total, Fair value   3,542
Total, Unrealized losses   $ (1)
U.S. federal agency obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
No. of securities | Number 3 18
Fair value, Less than 12 months $ 6,198 $ 23,015
Unrealized losses, Less than 12 months (6) (163)
Fair value, 12 months or longer 0 1,976
Unrealized losses, 12 months or longer 0 (24)
Total, Fair value 6,198 24,991
Total, Unrealized losses $ (6) $ (187)
Municipal obligations, tax exempt [Member]    
Schedule of Available-for-sale Securities [Line Items]    
No. of securities | Number 78 47
Fair value, Less than 12 months $ 27,441 $ 11,328
Unrealized losses, Less than 12 months (181) (53)
Fair value, 12 months or longer 0 2,132
Unrealized losses, 12 months or longer 0 (18)
Total, Fair value 27,441 13,460
Total, Unrealized losses $ (181) $ (71)
Municipal obligations, taxable [Member]    
Schedule of Available-for-sale Securities [Line Items]    
No. of securities | Number 2 105
Fair value, Less than 12 months $ 567 $ 38,605
Unrealized losses, Less than 12 months (1) (494)
Fair value, 12 months or longer 0 5,068
Unrealized losses, 12 months or longer 0 (87)
Total, Fair value 567 43,673
Total, Unrealized losses $ (1) $ (581)
Agency mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
No. of securities | Number 19 40
Fair value, Less than 12 months $ 10,936 $ 29,814
Unrealized losses, Less than 12 months (42) (166)
Fair value, 12 months or longer 0 2,925
Unrealized losses, 12 months or longer 0 (69)
Total, Fair value 10,936 32,739
Total, Unrealized losses $ (42) $ (235)