Acquired SJB Assets and FDIC Loss Sharing (Liability) Asset - Summary of Activity Related to FDIC Loss Sharing Asset (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
FDIC Indemnification Asset [Roll Forward]
Balance, beginning of period	$ 299	$ 4,764
FDIC share of additional losses, net of recoveries	(902)	342
Cash paid to FDIC, net	1,089	1,134
Net amortization	0	(3,932)
Other reductions, net	(715)	(2,009)
Balance, end of period	$ (229)	$ 299