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Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  | $ 64,824 |  |  |
Additions |  |  |  |  | 30,962 |  | 41,128 |
Balance at End of Period | 135,152 |  |  |  | 135,152 |  |  |
Mortgage Servicing Rights |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Balance at beginning of period | 71,225 |  | 43,098 |  | 64,824 |  | 5,315 |
Additions | 61,606 |  | 16,676 |  | 76,272 |  | 45,291 |
Changes in assumptions | 4,323 | [1] | 1,444 | [1] | (318) | [1] | 11,764 | [1]
Other changes | (2,002) | [2] | (984) | [2] | (5,626) | [2] | (2,136) | [2]
Balance at End of Period | $ 135,152 |  | $ 60,234 |  | $ 135,152 |  | $ 60,234 |
[1] | Primarily reflects changes in prepayment assumptions due to changes in market interest rates.
[2] | Represents changes due to realization of expected cash flows.

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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 -Subparagraph (a)(4)(i) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial 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 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition Fair value of an asset representing net future revenue 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 Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, 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 -Subparagraph (a)(4)(ii) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Details
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