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Fair Value of Financial Instruments (Details) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Carrying and fair values of financial instruments | ||
| Deposits | $ 1,095,183,000,000 | $ 1,105,261,000,000 |
| Long-term debt | 279,641,000,000 | 275,585,000,000 |
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Carrying Value [Member]
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| Carrying and fair values of financial instruments | ||
| Loans | 865,769,000,000 | 859,875,000,000 |
| Loans Held For Sale | 19,278,000,000 | 19,413,000,000 |
| Deposits | 1,095,183,000,000 | 1,105,261,000,000 |
| Long-term debt | 279,641,000,000 | 275,585,000,000 |
| Commercial Unfunded Lending Commitments | 900,000,000 | 1,000,000,000 |
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Fair Value [Member]
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| Carrying and fair values of financial instruments | ||
| Loans | 885,771,000,000 | 877,880,000,000 |
| Loans Held For Sale | 19,275,000,000 | 19,408,000,000 |
| Deposits | 1,095,688,000,000 | 1,105,669,000,000 |
| Long-term debt | 289,722,000,000 | 283,474,000,000 |
| Commercial Unfunded Lending Commitments | 4,100,000,000 | 4,500,000,000 |
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Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
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| Carrying and fair values of financial instruments | ||
| Loans | 103,505,000,000 | 105,119,000,000 |
| Loans Held For Sale | 15,655,000,000 | 15,087,000,000 |
| Deposits | 1,095,688,000,000 | 1,105,669,000,000 |
| Long-term debt | 287,367,000,000 | 281,173,000,000 |
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Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
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| Carrying and fair values of financial instruments | ||
| Loans | 782,266,000,000 | 772,761,000,000 |
| Loans Held For Sale | 3,620,000,000 | 4,321,000,000 |
| Deposits | ||
| Long-term debt | $ 2,355,000,000 | $ 2,301,000,000 |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
This item represents commerical unfunded lending commitments outstanding as of the balance sheet date. No definition available.
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| X | ||||||||||
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- Definition
The aggregate amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market, or have been elected at fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan). No definition available.
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| X | ||||||||||
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- Definition
This reflects the aggregate carrying amount of all categories of loans held in portfolio, net of unearned income and the allowance for losses on loans. No definition available.
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- Definition
The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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