Fair Value of Financial Instruments, Narrative (Details)	6 Months Ended	12 Months Ended
Jun. 30, 2013 Numberofbasispoints	Dec. 31, 2012
Investment securities fair value assumptions [Abstract]
Period of payment when prepayment penalty waived (in years)	5 years
Rate of voluntary prepayment (in hundredths)	1.00%	1.00%
Period of interest payment deferral by issuer (in years)	5 years
Servicing assets fair value assumptions expected loss recovery (in hundredths)	20.00%
Servicing assets fair value assumptions expected loss, maximum (in hundredths)	100.00%
Servicing assets fair value assumptions expected loss minimum (in hundredths)	80.00%
Servicing asset fair value assumption discount rate spread maximum (in basis points)	1,087
Servicing asset fair value assumption discount rate spread minimum (in basis points)	419

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The maximum number of years of interest payment can be deferred by issuing bank.

+ References

No definition available.

+ Details

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- Definition

The minimum number of years of payment and after which prepayment penalty is waived.

+ References

No definition available.

+ Details

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- Definition

The maximum basis point points (also referred to as 'margin') added to the reference rate on a LIBOR rate as stated.

+ References

No definition available.

+ Details

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- Definition

The minimum basis point points (also referred to as 'margin') added to the reference rate on a LIBOR rate as stated.

+ References

No definition available.

+ Details

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- Definition

The maximum amount of contractual collections of principal associated with a financial asset expected not to be collected due to default by the borrower which may be one of the factors applied in estimating the fair value of servicing assets.

+ References

No definition available.

+ Details

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- Definition

The minimum amount of contractual collections of principal associated with a financial asset expected not to be collected due to default by the borrower which may be one of the factors applied in estimating the fair value of servicing assets.

+ References

No definition available.

+ Details

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- Definition

The maximum estimated rate of recovery of losses on CDOs covered by servicing assets agreements.

+ References

No definition available.

+ Details

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- Definition

The estimated speed of prepayments of principal on financial assets which may be one of the factors applied in estimating the fair value of servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 140

-Paragraph 17

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS140-4/FIN46R-8

-Paragraph B8

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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