Investments (Narrative) (Details) - Financial Instruments [Domain] - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investment [Line Items]
Net change in unrealized gains (losses) from trading account assets supporting insurance liabilities	$ 200,000	$ 0	$ 900,000	$ 0
% of Total			100.00%		100.00%
Impaired Financing Receivable, Recorded Investment	22,700,000		$ 22,700,000		$ 15,900,000
Impaired Financing Receivable, Related Allowance	800,000		800,000		900,000
Impaired Financing Receivable Interest Income Recognized	400,000		400,000		800,000
Amortization Method Qualified Affordable Housing Project Investments	700,000		700,000		500,000
Qualified Affordable Housing Project Investments, Commitment (less than in 2015)	100,000		100,000		200,000
Loss from Affordable Housing Projects, Equity Method Investments	0	0	0	0
Affordable Housing Tax Credits And Other Tax Benefits, Amount (less than for three month periods)	100,000	$ 100,000	200,000	$ 200,000
Affordable Housing Project Investment, Write-down, Amount			0
Investment Grade Securities Gross Unrealized Losses	90,700,000		90,700,000		21,300,000
Gross unrealized losses related to other than high or highest quality securities	7,900,000		7,900,000		6,300,000
Available For Sale Securities Continuous Unrealized Loss Twelve Months Or Longer	10,000,000		10,000,000		12,000,000
Securities Loaned, Including Not Subject To Master Netting Arrangement And Assets Other Than Securities Transferred	110,000,000		110,000,000
Equity securities
Investment [Line Items]
Gross unrealized losses representing declines in value of greater than 20%	0		0		0
Commercial Loan on Other
Investment [Line Items]
Financing Receivable, Recorded Investment, Past Due	0		0		0
Commercial Loan
Investment [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	1,800,000,000		1,800,000,000		1,700,000,000
Commercial Loan on Hospitality
Investment [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 15,900,000		$ 15,900,000		$ 15,900,000
California
Investment [Line Items]
% of Total			22.00%
Texas
Investment [Line Items]
% of Total			11.00%
New Jersey
Investment [Line Items]
% of Total			10.00%