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Current Accounting Developments and Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for loan losses $ 655,523 $ 635,400 $ 601,673 $ 595,645 $ 582,517 $ 563,270 $ 541,579
Retained earnings $ (6,294,751)     (5,582,546)      
Accounting Standards Update 2022-02              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Allowance for loan losses       $ (6,000)      
Retained earnings     $ (4,300)