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Changes in Residential and Participation Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying value, beginning of period |  | $ 227,297 |
Carrying value, end of period |  | 247,734 | $ 227,297
Mortgage Servicing Rights |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Carrying value, beginning of period |  | 227,297 | 241,018
Additions |  | 48,990 | 34,821
Due to changes in interest rates and valuation assumptions |  | 23,884 | 7,377
Increase (decrease) in fair value, due to other changes | [1] | (56,782) | (55,919)
Carrying value, end of period |  | 243,389 | $ 227,297
Mortgage Servicing Rights Participation |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Additions |  | 5,063 |
Amortization |  | (718) |
Carrying value, end of period |  | $ 4,345 |
[1] | Includes loan payoffs and the passage of time.

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- Definition Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122739-111746 + 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=56950315&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=56950315&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=56950315&loc=d3e122625-111746 + Details
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