Investments (Schedule of Trust Preferred Securities) (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Huntington Cap Trust [Member]	Jun. 30, 2012 Huntington Cap Trust II [Member]	Jun. 30, 2012 BankAmerica Cap III [Member]	Jun. 30, 2012 Wachovia Cap Trust II [Member]	Jun. 30, 2012 Corestates Captl Tr II [Member]	Jun. 30, 2012 Chase Cap VI JPM [Member]	Jun. 30, 2012 Fleet Cap Tr V [Member]	Jun. 30, 2012 Trust preferred securities [Member]	Dec. 31, 2011 Trust preferred securities [Member]
Schedule of Investments [Line Items]
Single Issue or Pooled Flag			Single	Single	Single	Single	Single	Single	Single
Class			Preferred Stock	Preferred Stock	Preferred Stock	Preferred Stock	Preferred Stock	Preferred Stock	Preferred Stock
Amortized Cost	$ 130,898	$ 123,874	$ 931	$ 878	$ 958	$ 274	$ 927	$ 958	$ 972	$ 5,898	$ 5,890
Fair Value	132,804	125,301	714	685	709	228	765	711	734	4,546	4,618
Gross Unrealized Gain (Loss)			$ (217)	$ (193)	$ (249)	$ (46)	$ (162)	$ (247)	$ (238)	$ (1,352)
Lowest Credit Rating Assigned			B	B	BB	Baa2	Baa1	BBB	BB
Number of Banks Currently Performing			1	1	1	1	1	1	1
Expected Deferral/Defaults as a Percentage of Remaining Performing Collateral			None	None	None	None	None	None	None