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Mortgage Banking (Details) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Mortgage Banking [Abstract] |  |  |  |  |  |
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | $ (1,800,000) | $ 2,800,000 |  | $ (2,700,000) | $ 4,800,000 |
Mortgage servicing rights [Abstract] |  |  |  |  |  |
Balance at beginning of period |  |  | 43,274,000 | 43,274,000 | 51,151,000 | 51,151,000
Origination of servicing assets |  |  |  | 17,074,000 | 9,581,000 |
Change in fair value: |  |  |  |  |  |
Due to market changes |  |  |  | (8,960,000) | (12,288,000) |
Due to runoff |  |  |  | (7,177,000) | (4,785,000) |
Balance at end of period | 44,211,000 | 43,659,000 |  | 44,211,000 | 43,659,000 | 43,274,000
Mortgage loan servicing representation and warranty expenses incurred |  |  |  | 7,200,000 | 2,500,000 |
Accrual for mortgage loan servicing representation and warranty expenses |  |  | $ 4,000,000 | $ 8,600,000 |  | $ 4,300,000

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- Definition The amount of mortgage loan servicing put back expenses from representations and warranties on loans sold. + References No definition available. + Details
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- Definition Increase during the reporting period in the cumulative value of servicing rights. This increase is the result of new servicing rights that are created when mortgages are sold or transferred. Excludes disposals of mortgage loans sold serviced released. + References No definition available. + Details
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- Definition The net increase or decrease in fair value as a result of changes in the assumptions or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6863725&loc=d3e122625-111746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Name Statement of Financial Accounting Standard (FAS) -Publisher FASB -Number 140 -Paragraph 17 -Subparagraph d -Clause 1 -Subclause d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Net gain (loss) recognized in earnings during the reporting period representing the amount of the fair value of the hedges' ineffectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) -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 Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Fair value as of the balance sheet date of an asset representing net future revenues from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B9 -Subparagraph a(1) -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 Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 13A, 13B -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph f(1)(a) -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6863725&loc=d3e122625-111746 + Details
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