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Loan Servicing - Narrative (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Serviced sold mortgage loans | $ 1,326,000,000 | $ 1,311,000,000 | $ 1,347,000,000
Serviced sold mortgage loans with recourse | 11,000,000 | 16,000,000 |
Mortgage loans sold with recourse, reserve | 1,049,000 | 550,000 |
Mortgage servicing rights, discount rate | 10.00% |  |
Servicing fees included in other service income | $ 3,600,000 | $ 3,600,000 | $ 3,900,000
Minimum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 7.00% |  |
Maximum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 23.00% |  |

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- Definition Principal Amount Outstanding On Sold Loans Servicing Retained + References No definition available. + Details
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- Definition Principal Amount Outstanding On Sold Loans Servicing Retained With Recourse + References No definition available. + Details
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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107207-111719 + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13 (d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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