Commitments and Contingencies - (Reserve for Loan Repurchases) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reserve For Loan Respurchases [Roll Forward]
Beginning balance	$ 2,094	$ 2,318	$ 2,617	$ 2,269
Provision	557	239	1,015	581
Loss on repurchased loans and settlements	(3)	(163)	(984)	(456)
Ending balance	$ 2,648	$ 2,394	$ 2,648	$ 2,394