Investments (Unrealized Losses) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Credit impairment reported in earnings	$ 420,000	$ 0	$ 619,000	$ 0
Asset-Backed Security [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Securities, other-than-temporarily impaired	1
Credit impairment reported in earnings	390,000
Liquidity loss, not affecting current earnings, expected to be recovered	$ 235,000
Equity Securities [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Securities, other-than-temporarily impaired	2
Gross unrealized losses, number of securities rated investment grade	17		17
Debt Securities [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of issues	83		83
Gross unrealized losses, percentage of total debt	6.90%		6.90%
Gross unrealized losses, market value as a percent of amortized cost	96.60%		96.60%
Gross unrealized losses, number of securities with maturities of 12 months or greater	17		17
Gross unrealized losses, number of securities with maturities of 12 months or greater (as a percentage)	20.50%		20.50%
Debt Securities [Member] | Investment Grade [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	74		74
U.S. Treasury [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	0		0
U.S. Agencies [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	0		0
States and Political Subdivisions [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	11		11
States and Political Subdivisions [Member] | A Rating or Above [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	10		10
States and Political Subdivisions [Member] | BBB Rating [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	1		1
Foreign Governments [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	0		0
Public Utilities [Member] | BB Plus [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	10		10
Corporate [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	53		53
Corporate [Member] | Below Investment Grade [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	5		5
Mortgage-backed [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	2		2
Home Equity [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	6		6
Home Equity [Member] | AA Plus Rating [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	1		1
Home Equity [Member] | AAA Rating [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	3		3
Home Equity [Member] | AA Rating [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	2		2
Home Equity [Member] | CCC Rating [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	1		1
Manufactured Housing [Member]
Available-for-Sale Securities and Held-to-Maturity Securities [Line Items]
Gross unrealized losses, number of securities rated investment grade	1		1