Loans Receivable and Allowance for Loan Losses - Schedule of Changes in Allowance for Loans Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Beginning Balance	$ 23,998	$ 25,837	$ 15,032
Provision for Loan, Lease, and Other Losses	10,058	5,055	16,271
Charge-offs	(4,947)	(7,338)	(6,166)
Recoveries	1,823	444	700
Ending Balance	$ 30,932	$ 23,998	$ 25,837