Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2013 Significant Other Observable Inputs (Level 2)		Dec. 31, 2013 Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Fair Value, Measurements, Nonrecurring		Dec. 31, 2012 Fair Value, Measurements, Nonrecurring Significant Other Observable Inputs (Level 2)		Dec. 31, 2012 Fair Value, Measurements, Nonrecurring Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain impaired loans	$ 47,535				$ 47,535	$ 76,704				$ 76,704
Other assets	19,810	[1]	19,810	[1]		22,664	[1]	22,664	[1]
Total	$ 67,345		$ 19,810		$ 47,535	$ 99,368		$ 22,664		$ 76,704

[1] Represents the fair value of OREO, based on the appraised value of the collateral subsequent to its initial classification as OREO.