Disclosures about Fair Value of Financial Instruments - Statement of Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Detail) (Significant Unobservable Inputs (Level 3) [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Residential Mortgage Loan Commitments [Member]	Mar. 31, 2013 Loans Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at beginning	$ 240	$ 0
Issuances	103
Settlements	(240)
Balance at ending	103	3,173
Transfer from Level 2 to Level 3		$ 3,173