Indemnification Asset - Summary of Activity in Balance of Indemnification Asset (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
FDIC Indemnification Asset [Roll Forward]
Beginning (payable) receivable balance	$ (37)	$ 1,441	$ 206	$ 1,997
Effect of actual covered losses and change in estimated future covered losses	(4)	(505)	(569)	(783)
Reimbursable expenses (revenue), net	8	51	81	(42)
Payments made (received)	30	(126)	279	(311)
Ending (payable) receivable balance	$ (3)	$ 861	$ (3)	$ 861