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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - Mortgage servicing rights - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 34,198	$ 9,816	$ 19,082	$ 13,535
Transfers out of Level 3	0	0	0	(9,185)
Total gains or losses (realized/unrealized):
Included in earnings—realized	0	0	0	0
Included in earnings—fair value adjustment	(3,097)	110	(2,087)	(140)
Included in other comprehensive income	0	0	0	0
Amortization of premium (discount)	0	0	0	0
Additions	12,143	7,735	36,034	18,057
Sales and settlements	(2,407)	(6,285)	(12,192)	(10,891)
Balance at end of period	$ 40,837	$ 11,376	$ 40,837	$ 11,376

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Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Total Gains (Losses) [Abstract]

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in the income statement for 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.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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