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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Mortgage servicing rights |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 48,370 | $ 21,165 | $ 49,939 | $ 19,082
Total gains or losses (realized/unrealized): |  |  |  |
Included in earnings—fair value adjustment | (5,831) | 1,538 | (14,032) | 1,010
Additions | 12,766 | 13,699 | 21,348 | 23,891
Sales, paydowns, and other | (2,738) | (2,204) | (4,688) | (9,785)
Balance at end of period | 52,567 | 34,198 | 52,567 | 34,198
Agency mortgage-backed securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | 26,580 | 0 | 18,291 | 0
Total gains or losses (realized/unrealized): |  |  |  |
Included in earnings—fair value adjustment | 95 | 0 | 142 | 0
Additions | 11,277 | 0 | 21,103 | 0
Sales, paydowns, and other | (3,701) | 0 | (5,285) | 0
Balance at end of period | $ 34,251 | $ 0 | $ 34,251 | $ 0

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- Definition Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Fair Value Adjustment Including in Earnings + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales and Settlements + References No definition available. + Details
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- Definition Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Total Gains (Losses) [Abstract] + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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