Fair Value of Financial Instruments (Level 3 Securities) (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012		Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 22,120		$ 25,842
Realized gains	0	[1]	646	[1]
Unrealized gains (losses)	5	[1]	(363)	[1]
Purchases	5		184
Disposals	(267)		(4,446)
Transfers in	2,359		2,359
Ending Balance	24,222		24,222
States, Municipalities and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	815		880
Realized gains	0	[1]	0	[1]
Unrealized gains (losses)	0	[1]	0	[1]
Purchases	0		0
Disposals	0		(65)
Transfers in	0		0
Ending Balance	815		815
Foreign Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	836		836
Realized gains	0	[1]	0	[1]
Unrealized gains (losses)	0	[1]	0	[1]
Purchases	0		0
Disposals	0		0
Transfers in	0		0
Ending Balance	836		836
Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	16,499		20,285
Realized gains	0	[1]	646	[1]
Unrealized gains (losses)	11	[1]	(357)	[1]
Purchases	5		5
Disposals	(237)		(4,301)
Transfers in	0		0
Ending Balance	16,278		16,278
Asset-Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	315		315
Realized gains	0	[1]	0	[1]
Unrealized gains (losses)	(3)	[1]	(3)	[1]
Purchases	0		0
Disposals	(30)		(30)
Transfers in	2,307		2,307
Ending Balance	2,589		2,589
Equities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	3,655		3,526
Realized gains	0	[1]	0	[1]
Unrealized gains (losses)	(3)	[1]	(3)	[1]
Purchases	0		179
Disposals	0		(50)
Transfers in	52		52
Ending Balance	$ 3,704		$ 3,704

[1] Realized gains (losses) are recorded as a component of earnings whereas unrealized gains (losses) are recorded as a component of comprehensive income.