FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Fair Value Measurements Using Level 1
Assets
Impaired loans	$ 0	[1]
OREO	0
Covered OREO	0
Fair Value Measurements Using Level 2
Assets
Impaired loans	0	[1]
OREO	0
Covered OREO	0
Fair Value Measurements Using Level 3
Assets
Impaired loans	30,108	[1]
OREO	3,308
Covered OREO	$ 16,189

[1] Amounts represent the fair value of collateral for impaired loans allocated to the allowance for loan and lease losses. Fair values are determined using actual market prices (Level 1), independent third party valuations and borrower records, discounted as appropriate (Level 3).