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Mortgage Servicing - Schedule of Activity Related to MSRs - Amortization Method (Footnote) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Cumulative effect of fair value election |  | $ 0 | $ 82,043 |
Tax effect of adjustment on retained earnings | $ 6,800 |  |  |
Mortgage Servicing Rights - Amortized Costs [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Decrease in impairment valuation allowance | 24,800 |  |  | $ 24,788
Retained Earnings [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Cumulative effect of fair value election |  |  | $ 82,043 |
Retained Earnings [Member] | Fair Value Agency Mortgage Servicing Rights [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Cumulative effect of fair value election | $ 82,043 | $ 0 |  |

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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- Definition Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746 + Details
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