Investments (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2014 investments	Jun. 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	1,109,829,000	1,109,829,000	56,830,000
Available For Sale Securities Continuous Unrealized Loss Position 12 Months Or Longer Aggregate Losses Acumulated In Investments	15,135,000	15,135,000	1,105,000
Number of investments in continuous unrealized loss position for more than twelve months	104	104
Investment value deemed to be OTTI	0	0
Investment securities, aggregate carrying value, pledged as collateral	$ 2,850,000,000	$ 2,850,000,000	$ 2,750,000,000