Reserve for Repurchased Loans and Loss Sharing Obligations - Analysis of Reserve for Repurchased Loans and Loss Sharing Obligations (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
Disclosure Reserve For Repurchased Loans Analysis Of Reserve For Repurchased Loans [Abstract]
Balance at beginning of period	$ 1,688	$ 855	$ 1,203	$ 705
Provision charged to operations		100	975	250
Loss on loans repurchased, settlements or payments under loss sharing arrangements			(695)
Recoveries			205
Balance at end of period	$ 1,688	$ 955	$ 1,688	$ 955