Loans Receivable, Net - Analysis of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year				$ 16,722				$ 16,317	$ 16,722	$ 16,317	$ 20,930
Provision charged to operations	$ 510	$ 888	$ 662	$ 563	$ 300	$ 300	$ 300	$ 375	2,623	1,275	2,630
Charge-offs									(4,490)	(1,135)	(7,827)
Recoveries									328	265	584
Balance at end of year	$ 15,183				$ 16,722				$ 15,183	$ 16,722	$ 16,317