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Accounting for Certain Loans Acquired in a Purchase - Contractually Required Payments (Details) - MBT - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 01, 2019
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]    
Contractually required payments receivable at acquisition date $ 6,840 $ 6,840
Nonaccretable difference 2,733  
Expected cash flows at acquisition date 4,107  
Accretable difference 576  
Basis in loans at acquisition date $ 3,531 $ 3,531