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Business Combinations - Fair Value Adjustments Made to the Amortized Cost (Details)
$ in Thousands
Jul. 31, 2020
USD ($)
Business Acquisition [Line Items]  
Gross amortized cost basis at July 31, 2020 $ 1,787,057
Interest rate fair value adjustment on all loans 455
Credit fair value adjustment on non-PCD loans (21,397)
Fair value of acquired loans at July 31, 2020 1,766,115
Allowance for credit losses on PCD loans (13,586)
Loans, net $ 1,752,529