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Business Combination and Asset Purchase - Summary of Changes in Accretable Yield or Income Expected to be Collected (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Business Combinations [Abstract]  
Balance - January 1, 2019 $ 2,544
Additions 1
Accretion (109)
Balance - March 31, 2019 $ 2,436