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Acquisition Activity - Summary of the Accretable Yield on the Loans Acquired with Deteriorated Credit Quality (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in accretable yield
Balance, beginning of period	$ (9,147)	$ (9,303)	$ (11,091)
Acquisition accretable yield	0	0	(1,981)
Accretion	2,202	2,425	5,109
Net transfers from nonaccretable discount to accretable yield	(428)	(2,269)	(1,340)
Balance, end of period	$ (7,373)	$ (9,147)	$ (9,303)