Unearned ESOP Shares - Interest Paid on ESOP Loan and Dividends Received on Unallocated Shares (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Interest paid on ESOP loan	$ 23,022	$ 31,597	$ 43,303
Dividends on unallocated shares		19	32
ESOP [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Interest paid on ESOP loan		$ 13	$ 38