Fair Value Measurements (Impaired Loans Remeasured and Reported at Fair Value of Underlying Collateral) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of impaired loans before allocations	$ 48,462	$ 80,397
Specific valuation allowance allocations	(6,926)	(8,237)
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of impaired loans before allocations	9,374	18,319	4,158
Specific valuation allowance allocations	(2,785)	(3,634)	(1,361)
Fair value	6,589	14,685	2,797
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of impaired loans before allocations	0	15,754	2,310
Specific valuation allowance allocations	0	(2,911)	(1,528)
Fair value	$ 0	$ 12,843	$ 782