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Regulatory Capital - Adjusted Transition Amounts (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jan. 01, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Retained earnings $ 3,485,732   $ 3,163,640        
Allowance for credit losses 1,364,716 $ 1,479,306 1,357,075 $ 1,081,066 $ 1,227,362 $ 1,165,335  
Liability for unfunded commitments 62,600 $ 32,720 124,924 $ 113,525 $ 32,707 72,713  
Accounting Standards Update 2016-13              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Allowance for credit losses             $ 1,100,000
Liability for unfunded commitments             116,000
Deferred tax asset             $ 306,000
Adjusted Phase-In Amounts Remaining              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Retained earnings           836,351  
Allowance for credit losses           1,038,145  
Liability for unfunded commitments           104,377  
Deferred tax asset           $ 306,171  
Adjusted Phase-In Amounts Remaining | Accounting Standards Update 2016-13 | Remaining Adjusted Transition Amounts to be Phased-In              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Retained earnings 418,175            
Allowance for credit losses 519,073            
Liability for unfunded commitments 52,189            
Deferred tax asset 153,087            
Adjustments | Accounting Standards Update 2016-13              
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]              
Retained earnings (209,088)   (209,088)        
Allowance for credit losses (259,536)   (259,536)        
Liability for unfunded commitments (26,094)   (26,094)        
Deferred tax asset $ (76,542)   $ (76,542)