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Purchased Credit Impaired Loans - Loans Acquired for Which Contractually Required Payments Would not be Collected (Details) - MBT - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 01, 2019
Business Combination, Separately Recognized Transactions [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