Reserve for Repurchased Loans and Loss Sharing Obligations - Analysis of Reserve for Repurchased Loans and Loss Sharing Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Reserve For Repurchased Loans Analysis Of Reserve For Repurchased Loans [Abstract]
Balance at beginning of year	$ 1,032	$ 1,468	$ 1,203
Provision charged to operations			975
Loss on loans repurchased, settlements or payments under loss sharing arrangements	(56)	(436)	(915)
Recoveries	10		205
Balance at end of year	$ 986	$ 1,032	$ 1,468