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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 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)
Year Ended December 31, 2020
(in thousands)As ReportedAdjustmentAs Corrected
Investing Activities
Proceeds from sales of investment securities available for sale$4,054,670 $(1,404,984)$2,649,686 
Purchases of investment securities available for sale(7,441,163)1,404,984 (6,036,179)
Net cash used in investing activities$2,352,973 $— $2,352,973 
Accounting Standards Update and Change in Accounting Principle
The following table illustrates the impact of ASC 326 adoption:
As of January 1, 2020
in thousandsPre-ASC 326 AdoptionImpact of ASC 326 AdoptionAs Reported under ASC 326
Assets
Allowance for loan losses:
Commercial and industrial$145,782 $(2,310)$143,472 
Commercial real estate67,430 (651)66,779 
Consumer68,190 85,955 154,145 
Total allowance for loan losses$281,402 $82,994 $364,396 
Liabilities
Reserve for unfunded commitments$1,375 $27,440 $28,815 
Allowance for credit losses$282,777 $110,434 $393,211 
The following table illustrates the distribution of the ASC 326 adoption impact to loans and equity:
As of January 1, 2020
in thousandsPre-ASC 326 AdoptionImpact of ASC 326 AdoptionAs Reported under ASC 326
Loans, net$36,881,048 $(20,767)$36,860,281 
Retained earnings1,068,327 (35,721)1,032,606