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Basis of Presentation and Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]  
Schedule of Error Corrections and Prior Period Adjustments
A summary of corrections is presented below.
Corrected Consolidated Statement of Cash Flows
(unaudited)
Nine months ended September 30, 2020
(in thousands)As ReportedAdjustmentAs Corrected
Investing Activities
Proceeds from sales of investment securities available for sale$3,932,368 $(1,402,646)$2,529,722 
Purchases of investment securities available for sale(6,180,812)1,402,646 (4,778,166)
Net cash used in investing activities$(3,223,538)$— $(3,223,538)