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Loan and Lease Receivables - Estimated Fair Value of Impaired Loans Acquired at Acquisition (Details) - Acquired Impaired Loans
$ in Thousands
Apr. 30, 2019
USD ($)
Accounts Notes And Loans Receivable [Line Items]  
Undiscounted contractual cash flows $ 74,092
Undiscounted cash flows not expected to be collected (non-accretable difference) 11,401
Undiscounted cash flows expected to be collected 62,691
Accretable yield at acquisition (9,764)
Estimated fair value of impaired loans acquired at acquisition $ 52,927