Non Traditional Mortgage Performance by Credit Score (Detail) (USD $) In Thousands, unless otherwise specified				3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 Non-Traditional One To Four Family First Mortgage Fico Score Loan	Dec. 31, 2013 Non-Traditional One To Four Family First Mortgage Fico Score Loan	Mar. 31, 2014 Non-Traditional One To Four Family First Mortgage Fico Score 800+ Loan	Dec. 31, 2013 Non-Traditional One To Four Family First Mortgage Fico Score 800+ Loan	Mar. 31, 2014 Non-Traditional One To Four Family First Mortgage Fico Score 700-799 Loan	Dec. 31, 2013 Non-Traditional One To Four Family First Mortgage Fico Score 700-799 Loan	Mar. 31, 2014 Non-Traditional One To Four Family First Mortgage Fico Score 600-699 Loan	Dec. 31, 2013 Non-Traditional One To Four Family First Mortgage Fico Score 600-699 Loan	Mar. 31, 2014 Non-Traditional One To Four Family First Mortgage Fico Score Below 600 Loan	Dec. 31, 2013 Non-Traditional One To Four Family First Mortgage Fico Score Below 600 Loan	Mar. 31, 2014 Non-Traditional One To Four Family First Mortgage Fico Score Non FICO Score Loan	Dec. 31, 2013 Non-Traditional One To Four Family First Mortgage Fico Score Non FICO Score Loan
Loans and Leases Receivable [Line Items]
Count				167	173	7	7	91	94	43	44	13	14	13	14
Amount	$ 2,396,995	$ 2,446,111	$ 1,627,272	$ 143,708	$ 147,705	$ 1,178	$ 1,382	$ 71,894	$ 74,876	$ 41,985	$ 42,739	$ 11,907	$ 11,965	$ 16,744	$ 16,743
Percent				100.00%	100.00%	0.80%	0.90%	50.00%	50.80%	29.20%	28.90%	8.30%	8.10%	11.70%	11.30%
Count Change				(6)				(3)		(1)		(1)		(1)
Amount Change				$ (3,997)		$ (204)		$ (2,982)		$ (754)		$ (58)		$ 1
Percent Change				0.00%		(0.10%)		(0.80%)		0.30%		0.20%		0.40%