Significant Accounting Policies - Additional Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accounting Policies [Abstract]
Cash paid for interest	$ 2,794	$ 3,639
Cash paid for income taxes	0	0
Unsettled security transactions	94,905	12,192
Loans foreclosed and transferred to other real estate owned and foreclosed assets	$ 376	$ 67