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Purchased Loans - Fair Value of Loans Purchased from Charter (Detail) - USD ($)
$ in Thousands
3 Months Ended
Oct. 01, 2019
Mar. 31, 2020
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities [Abstract]    
Contractually-required principal $ 104,127  
Nonaccretable difference (68)  
Cash flows expected to be collected 104,059  
Accretable yield (394) $ (5)
Fair Value $ 103,665