Securities Available for Sale (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Security
Summary of the range of the losses
Number of Individual Securities	5
Fair Value	$ 18,378,176
Unrealized Loss	(1,611,678)
Security group one [Member]
Summary of the range of the losses
Number of Individual Securities	4
Fair Value	16,758,076
Unrealized Loss	(1,214,073)
Range of Loss	Less than or equal to 10
Security group two [Member]
Summary of the range of the losses
Number of Individual Securities	1
Fair Value	1,620,100
Unrealized Loss	$ (397,605)
Range of Loss	Less than or equal to 20