Liability for Losses Under Representations and Warranties (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Liability for representations and warranties
Balance at beginning of the period	$ 6,185	$ 1,387	$ 3,504	$ 449
Provisions for losses on loans sold	1,069	918	3,766	1,856
Incurred losses	(39)		(55)
Balance at end of period	7,215	2,305	7,215	2,305
Unpaid principal balance of mortgage loans subject to representations and warranties	20,428,213	6,444,618	20,428,213	6,444,618
During the period:
Unpaid balance of mortgage loans repurchased	1,973		6,840
Unpaid principal balance of mortgage loans put to correspondent lenders	357		1,410
At period end:
Unpaid balance of mortgage loans subject to pending claims for repurchase	$ 1,249	$ 3,459	$ 1,249	$ 3,459