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Business Combination and Asset Purchase - Summary of Changes in Accretable Yield or Income Expected to be Collected (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Business Combinations [Abstract]    
Beginning Balance $ 2,021 $ 2,544
Additions 1 1
Accretion (106) (109)
Reclassification from nonaccretable difference 62  
Ending Balance $ 1,978 $ 2,436