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Investments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Amortized cost $ 226,682 $ 207,826
Gross unrealized gains 5,560 5,676
Gross unrealized losses (256) (202)
Estimated fair value 231,986 213,300
US Treasury Securities [Member]
   
Amortized cost 500  
Gross unrealized gains 1  
Gross unrealized losses 0  
Estimated fair value 501  
Agency Securities [Member]
   
Amortized cost 14,598 8,804
Gross unrealized gains 46 50
Gross unrealized losses (24) (6)
Estimated fair value 14,620 8,848
Nontaxable Municipal Bonds [Member]
   
Amortized cost 79,495 73,699
Gross unrealized gains 3,293 3,618
Gross unrealized losses (61) (31)
Estimated fair value 82,727 77,286
Taxable Municipal Bonds [Member]
   
Amortized cost 47,598 37,334
Gross unrealized gains 889 818
Gross unrealized losses (99) (10)
Estimated fair value 48,388 38,142
Collateralized Mortgage Backed Securities [Member]
   
Amortized cost 77,135 81,113
Gross unrealized gains 926 889
Gross unrealized losses (72) (154)
Estimated fair value 77,989 81,848
Certificates Of Deposit [Member]
   
Amortized cost 6,754 6,274
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated fair value 6,754 6,274
Common Stock [Member]
   
Amortized cost 602 602
Gross unrealized gains 405 301
Gross unrealized losses 0 (1)
Estimated fair value $ 1,007 $ 902