Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Debt securities	$ 401,435	$ 380,469
Equity securities	43,925	44,159
Debt and equity securities	445,360	424,628
US Treasury Securities and Obligation [Member]
Debt securities	40,061	11,176
Corporate Bond Securities [Member]
Debt securities	81,547	93,922
Collateralized Corporate Bank Loans [Member]
Debt securities	106,371	92,893
Municipal Bonds [Member]
Debt securities	163,732	178,341
Collateralized Mortgage Backed Securities [Member]
Debt securities	9,724	4,137
Equity Securities Financial Services [Member]
Equity securities	14,887	15,821
Equity Securities, Other [Member]
Equity securities	29,038	28,338
Fair Value, Inputs, Level 1 [Member]
Debt securities	0	0
Equity securities	43,925	44,159
Debt and equity securities	43,925	44,159
Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities and Obligation [Member]
Debt securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Corporate Bond Securities [Member]
Debt securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Collateralized Corporate Bank Loans [Member]
Debt securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Municipal Bonds [Member]
Debt securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Collateralized Mortgage Backed Securities [Member]
Debt securities	0	0
Fair Value, Inputs, Level 1 [Member] \| Equity Securities Financial Services [Member]
Equity securities	14,887	15,821
Fair Value, Inputs, Level 1 [Member] \| Equity Securities, Other [Member]
Equity securities	29,038	28,338
Fair Value, Inputs, Level 2 [Member]
Debt securities	381,767	359,861
Equity securities	0	0
Debt and equity securities	381,767	359,861
Fair Value, Inputs, Level 2 [Member] \| US Treasury Securities and Obligation [Member]
Debt securities	40,061	11,176
Fair Value, Inputs, Level 2 [Member] \| Corporate Bond Securities [Member]
Debt securities	81,547	93,922
Fair Value, Inputs, Level 2 [Member] \| Collateralized Corporate Bank Loans [Member]
Debt securities	105,463	91,707
Fair Value, Inputs, Level 2 [Member] \| Municipal Bonds [Member]
Debt securities	144,972	158,919
Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage Backed Securities [Member]
Debt securities	9,724	4,137
Fair Value, Inputs, Level 2 [Member] \| Equity Securities Financial Services [Member]
Equity securities	0	0
Fair Value, Inputs, Level 2 [Member] \| Equity Securities, Other [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member]
Debt securities	19,668	20,608
Equity securities	0	0
Debt and equity securities	19,668	20,608
Fair Value, Inputs, Level 3 [Member] \| US Treasury Securities and Obligation [Member]
Debt securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Corporate Bond Securities [Member]
Debt securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Collateralized Corporate Bank Loans [Member]
Debt securities	908	1,186
Fair Value, Inputs, Level 3 [Member] \| Municipal Bonds [Member]
Debt securities	18,760	19,422
Fair Value, Inputs, Level 3 [Member] \| Collateralized Mortgage Backed Securities [Member]
Debt securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Equity Securities Financial Services [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Equity Securities, Other [Member]
Equity securities	$ 0	$ 0

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ Details

- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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+ Details