Off-Balance Sheet Lending-Related Financial Instruments, Guarantees and Other Commitments Off-Balance Sheet Lending Related Financial Instrument, Guarantees and Other Commitments (Policies)	3 Months Ended
Mar. 31, 2012
Off balance sheet lending related financial instruments guarantees and other commitments [Abstract]
Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]	To provide for the risk of loss inherent in wholesale and consumer (excluding credit card) contracts, an allowance for credit losses on lending-related commitments is maintained.

Description of accounting policies and methodologies used to estimate the entity's liability for off-balance sheet credit exposures and related charges for those credit exposures.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

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

-Publisher FASB

-Name Accounting Standards Codification

-Section 50

-Paragraph 9

-SubTopic 10

-Topic 310

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5144-111524

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