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Investments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Number
Dec. 31, 2012
Number
No. of securities 73 51
Fair value, Less than 12 months $ 35,479 $ 37,853
Unrealized losses, Less than 12 months (237) (200)
Fair value, 12 months or longer 2,460 209
Unrealized losses, 12 months or longer (19) (2)
Total, Fair value 37,939 38,062
Total, Unrealized losses (256) (202)
Agency Securities [Member]
    
No. of securities 3 2
Fair value, Less than 12 months 3,727 2,241
Unrealized losses, Less than 12 months (24) (6)
Fair value, 12 months or longer 0 0
Unrealized losses, 12 months or longer 0 0
Total, Fair value 3,727 2,241
Total, Unrealized losses (24) (6)
Nontaxable Municipal Bonds [Member]
    
No. of securities 27 16
Fair value, Less than 12 months 5,962 4,669
Unrealized losses, Less than 12 months (46) (31)
Fair value, 12 months or longer 1,678 0
Unrealized losses, 12 months or longer (15) 0
Total, Fair value 7,640 4,669
Total, Unrealized losses (61) (31)
Taxable Municipal Bonds [Member]
    
No. of securities 28 8
Fair value, Less than 12 months 11,170 2,948
Unrealized losses, Less than 12 months (95) (8)
Fair value, 12 months or longer 782 209
Unrealized losses, 12 months or longer (4) (2)
Total, Fair value 11,952 3,157
Total, Unrealized losses (99) (10)
Collateralized Mortgage Backed Securities [Member]
    
No. of securities 15 24
Fair value, Less than 12 months 14,620 27,974
Unrealized losses, Less than 12 months (72) (154)
Fair value, 12 months or longer 0 0
Unrealized losses, 12 months or longer 0 0
Total, Fair value 14,620 27,974
Total, Unrealized losses (72) (154)
Common Stock [Member]
    
No. of securities   1
Fair value, Less than 12 months   21
Unrealized losses, Less than 12 months   (1)
Fair value, 12 months or longer   0
Unrealized losses, 12 months or longer   0
Total, Fair value   21
Total, Unrealized losses   $ (1)