Investments (Details 15) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Financing Receivable Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 48,490		$ 48,490		$ 61,812
Impaired Financing Receivable Recorded Investment	47,808		47,808		60,904
Impaired Financing Receivable Related Allowance	6,959		6,959		8,188
Impaired Financing Receivable Net Of Related Allowance	40,849		40,849		52,716
Impaired Financing Receivable, Average Recorded Investment	52,332	36,628	55,189	36,301
Impaired Financing Receivable Interest Income Accrual Method	438	260	915	546
Commercial Real Estate Other Receivable With No Related Allowance [Member]
Financing Receivable Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	10,066		10,066		32,088
Impaired Financing Receivable Recorded Investment	9,523		9,523		31,496
Impaired Financing Receivable Related Allowance	0		0		0
Impaired Financing Receivable Net Of Related Allowance	9,523		9,523		31,496
Impaired Financing Receivable, Average Recorded Investment	10,585	12,720	17,555	14,114
Impaired Financing Receivable Interest Income Accrual Method	28	51	197	93
Commercial Real Estate Other Receivable With Related Allowance [Member]
Financing Receivable Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	38,424		38,424		29,724
Impaired Financing Receivable Recorded Investment	38,285		38,285		29,408
Impaired Financing Receivable Related Allowance	6,959		6,959		8,188
Impaired Financing Receivable Net Of Related Allowance	31,326		31,326		21,220
Impaired Financing Receivable, Average Recorded Investment	41,747	23,908	37,634	22,187
Impaired Financing Receivable Interest Income Accrual Method	$ 410	$ 209	$ 718	$ 453