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FAIR VALUES OF FINANCIAL INSTRUMENTS - Quantitative Information About Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgage servicing rights, at fair value	$ 48,370	$ 49,939	$ 21,165	$ 19,082
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Mortgage servicing rights, at fair value	$ 48,370	$ 49,939
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights | Discounted cash flow | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	9.00%	9.00%
Prepayment rate	6.16%	6.07%
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights | Discounted cash flow | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	14.50%	18.00%
Prepayment rate	38.01%	35.01%
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage servicing rights | Discounted cash flow | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	9.82%	9.75%
Prepayment rate	14.43%	11.81%

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+ References

No definition available.

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ 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 (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ 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 (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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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=68078379&loc=d3e122625-111746

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