Investments (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014 investments	Sep. 30, 2014 investments	Dec. 31, 2013
Investments [Abstract]
Securities gains (losses)	$ 0	$ 0
Unrealized Losses Related to Marketability of Securities or Issuer's Ability to Honor Redemption Obligations	0	0	0
Fair Value, 12 months or more in unrealized loss position	1,090,467,000	1,090,467,000	56,830,000
Unrealized Losses, Greater than 12 months	19,288,000	19,288,000	1,105,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	107	107
Investment value deemed to be OTTI	0	0
Investment securities, aggregate carrying value, pledged as collateral	$ 2,780,000,000	$ 2,780,000,000	$ 2,750,000,000