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Business Combination & Asset Purchase - Summary of Changes in Accretable Yield or Income Expected to be Collected (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Business Combinations [Abstract]  
Beginning Balance $ 2,544
Additions 6
Accretion (2,426)
Reclassification from nonaccretable difference 2,019
Disposals (122)
Ending Balance $ 2,021