USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Changes in AOCI (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated other comprehensive income (loss) [Line Items]
Beginning Balance	$ 219,143
Other comprehensive income (loss) before reclassifications	4,037
Amounts reclassified from accumulated other comprehensive income	4,722	5,434
Other comprehensive income (loss)	8,759	208
Ending Balance	227,902
Gains and Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss) [Line Items]
Beginning Balance	(6,305)
Other comprehensive income (loss) before reclassifications	(12,656)
Amounts reclassified from accumulated other comprehensive income	4,722
Other comprehensive income (loss)	(7,934)
Ending Balance	(14,239)
Unrealized Gains and Losses on Available-for-sale Securities [Member]
Accumulated other comprehensive income (loss) [Line Items]
Beginning Balance	225,448
Other comprehensive income (loss) before reclassifications	16,693
Amounts reclassified from accumulated other comprehensive income	0
Other comprehensive income (loss)	16,693
Ending Balance	$ 242,141