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Credit Quality and Allowance for Loan Losses - Summary of Accretable Yield on Loans Accounted for under ASC 310-30 (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Certain Loans Acquired in Transfer Accounted for as Debt Securities [Abstract]
Balance at beginning of period	$ (11,091)	$ (16,792)
Accretion	2,495	5,155
Transfers from nonaccretable difference to accretable yield	(1,208)	(879)
Balance at end of period	$ (9,804)	$ (12,516)