Fair Value (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013 Security	Dec. 31, 2012 Security
Fair Value (Additional Textual) [Abstract]
Number of debt securities with other-than-temporary impairment	11	2
Minimum effective discount rate on overall basis	6.61%
Maximum effective discount rate on overall basis	15.71%
Minimum assets of trust preferred securities issued by institution	$ 15,000,000,000
Maturity period of short-term borrowings	one year or less
Period of swap rate	25 years
OTTI recognized value reflecting the estimated fair value of the securities	$ 2,000,000
Trust preferred securities
Fair Value (Textual) [Abstract]
Projected Prepayments, minimum fixed rate coupons	8.00%	8.00%
Floating spread rate of trust preferred securities	0.0300	0.0300
Projected Prepayments, percentage of fair value input for banks	5.00%	5.00%
Period frequency of projected prepayment rate	5 years	5 years
Beginning year for projected prepayments for all banks	2018	2018
Projected prepayment, percentage of fair value for collateral by REITs	0.00%	0.00%
Annually projected defaults percentage for healthy banks	2.00%	2.00%
Period frequency of projected default rate	2 years	2 years
Projected defaults rate for healthy banks	0.36%	0.36%
Projected Recoveries, percentage for insurance companies, REITs and insolvent banks	0.00%	0.00%
Projected recovery, percentage for projected bank deferrals	10.00%	10.00%
Trust preferred securities | Minimum
Fair Value (Textual) [Abstract]
Fair value input discount rate	6.61%	5.69%
Trust preferred securities | Maximum
Fair Value (Textual) [Abstract]
Fair value input discount rate	15.71%	21.76%