Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Assets [Abstract]
Other assets	$ 17,718	$ 14,332
Prepaid expenses
Other Assets [Abstract]
Other assets	8,151	6,807
Deferred acquisition compensation
Other Assets [Abstract]
Other assets	2,401	2,695
Loan servicing assets at fair value
Other Assets [Abstract]
Other assets	3,496	2,181
Accounts receivable
Other Assets [Abstract]
Other assets	2,282	1,744
Deposits
Other Assets [Abstract]
Other assets	665	657
Receivable from investors
Other Assets [Abstract]
Other assets	340	155
Tenant improvement receivable
Other Assets [Abstract]
Other assets	172	0
Other
Other Assets [Abstract]
Other assets	$ 211	$ 93