Loans - Changes in Servicing Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	$ 13,773	$ 6,833
Addition related to sale of SBA loans	1,181	413
Amortization	(1,829)	(891)
Balance at end of period	13,125	6,355
Servicing Liability at Fair Value, Amount [Roll Forward]
Balance at beginning of period	5,971	106
Amortization	(603)	(3)
Balance at end of period	$ 5,368	$ 103