Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Total debt securities	$ 399,069	$ 380,469
Total equity securities	40,715	44,159
Total debt and equity securities	439,784
US Treasury Securities and Obligation [Member]
Total debt securities	15,127
Corporate Bond Securities [Member]
Total debt securities	102,022
Collateralized Corporate Bank Loans [Member]
Total debt securities	108,863
Municipal Bonds [Member]
Total debt securities	169,455
Collateralized Mortgage Backed Securities [Member]
Total debt securities	3,602
Equity Securities Financial Services [Member]
Total equity securities	14,294
Equity Securities, Other [Member]
Total equity securities	26,421
Fair Value, Inputs, Level 1 [Member]
Total debt securities	0
Total equity securities	40,715
Total debt and equity securities	40,715
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities and Obligation [Member]
Total debt securities	0
Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities [Member]
Total debt securities	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Corporate Bank Loans [Member]
Total debt securities	0
Total equity securities	0
Total debt and equity securities	0
Fair Value, Inputs, Level 1 [Member] | Municipal Bonds [Member]
Total debt securities	0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Backed Securities [Member]
Total debt securities	0
Fair Value, Inputs, Level 1 [Member] | Equity Securities Financial Services [Member]
Total equity securities	14,294
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Other [Member]
Total equity securities	26,421
Fair Value, Inputs, Level 2 [Member]
Total debt securities	379,250
Total equity securities	0
Total debt and equity securities	379,250
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities and Obligation [Member]
Total debt securities	15,127
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]
Total debt securities	102,022
Fair Value, Inputs, Level 2 [Member] | Collateralized Corporate Bank Loans [Member]
Total debt securities	107,810
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member]
Total debt securities	150,689
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Backed Securities [Member]
Total debt securities	3,602
Fair Value, Inputs, Level 2 [Member] | Equity Securities Financial Services [Member]
Total equity securities	0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Other [Member]
Total equity securities	0
Fair Value, Inputs, Level 3 [Member]
Total debt securities	19,819
Total equity securities	0
Total debt and equity securities	19,819
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities and Obligation [Member]
Total debt securities	0
Fair Value, Inputs, Level 3 [Member] | Corporate Bond Securities [Member]
Total debt securities	0
Fair Value, Inputs, Level 3 [Member] | Collateralized Corporate Bank Loans [Member]
Total debt securities	1,053
Fair Value, Inputs, Level 3 [Member] | Municipal Bonds [Member]
Total debt securities	18,766
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Backed Securities [Member]
Total debt securities	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities Financial Services [Member]
Total equity securities	0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Other [Member]
Total equity securities	$ 0