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Purchased Loans - Accretable Yield of Loans Purchased with Deteriorated Credit Quality (Detail) - USD ($)
$ in Thousands
12 Months Ended
Oct. 01, 2019
Dec. 31, 2019
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]    
Balance at January 1, 2019  
Additions through acquisition   (36)
Reclasses from nonaccretable difference   12
Accretion $ 394 8
Balance at December 31, 2019   $ (16)