FAIR VALUE - Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance		$ 19,771	[1]	$ 26,020	[1]	$ 22,914	[2]	$ 27,297	[2]
Total gains or (losses) (realized/unrealized):
Included in earnings	[2]					0		(387)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Other Comprehensive Income Loss		1,754	[1]	(477)	[1]	2,500	[2]	1,339	[2]
Principal Repayments		(1,186)	[1]	(1,065)	[1]	(5,075)	[2]	(3,771)	[2]
Ending balance	[2]	20,339	[1]	24,478		20,339	[1]	24,478
Available for Sale Securities
Total gains or (losses) (realized/unrealized):
Included in earnings		$ 0		$ 0		$ 0		$ (387)

[1] Amounts mostly related to private label mortgage-backed securities.

[2] Amounts mostly related to private label mortgage-backed securities.