Reserve for Repurchased Loans and Loss Sharing Obligations - Summary of Reserve for Repurchased Loans and Loss Sharing Obligations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
Disclosure Reserve For Repurchased Loans Analysis Of Reserve For Repurchased Loans [Abstract]
Balance at beginning of period	$ 1,203	$ 1,468	$ 1,468
Provision charged to operations	975
Loss on loans repurchased, settlements or payments under loss sharing arrangements	(695)
Recoveries	205
Balance at end of period	$ 1,688	$ 1,468	$ 1,468