Gain on Loans Held for Sale (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
Loans Held for Sale [Line Items]
Gain on sale of mortgage loans			$ (2,192)	$ 6,352
Loans held for sale
Loans Held for Sale [Line Items]
Gain on sale of mortgage loans	1,424	9,290	5,333	13,995
Net loan servicing	296	(13)	494	(17)
Unrealized gains (losses) from derivative financial statements	584	461	393	1,513
Realized gains (losses) derivative financial instruments	367	(255)	519	(291)
Mark-to-market (loss) gain on LHFS	(610)	4,726	(2,192)	6,418
Direct origination (expenses) fees, net	(964)	(5,948)	(1,943)	(8,830)
Provision for repurchases	(32)	(411)	(83)	(438)
Total gain on LHFS	$ 1,065	$ 7,850	$ 2,521	$ 12,350