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Purchased Loans - Narrative (Details)
9 Months Ended
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
loan
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract]            
Outstanding balance of restructured loans $ 10,930,648,000     $ 9,856,743,000    
Troubled debt restructured that has subsequently defaulted 0 $ 0        
Allowance for loan losses attributable to restructured loans $ 174,356,000 $ 170,038,000 $ 166,131,000 $ 164,171,000 $ 172,354,000 $ 176,144,000
Purchased loans            
Loans and Allowance for Loan Losses (Textual) [Abstract]            
Number of restructured loans | loan 0 1        
Restructured loans discontinued past due period 90 days 90 days        
Outstanding balance of restructured loans   $ 40,000        
Remaining availability under commitments to lend additional funds on restructured loans $ 0 2,000        
Purchased loans | Restructured loans            
Loans and Allowance for Loan Losses (Textual) [Abstract]            
Outstanding balance of restructured loans 3,029,000 17,726,000        
Allowance for loan losses attributable to restructured loans $ 37,000 $ 111,000