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Securities - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
security
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
security
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Fair value of debt securities from AFS to HTM   $ 3,010,000,000.00        
Unrealized losses, net of tax, from transfer of AFS to HTM   $ 113,000,000        
AFS and HTM, accrued interest $ 33,800,000     $ 33,800,000   $ 33,100,000
Available-for-sale debt securities fair value, Total $ 5,768,304,000     $ 5,768,304,000   $ 7,711,952,000
Number of available-for-sale debt securities in an unrealized loss position | security 557     557   431
Debt Securities, AFS, allowance for credit loss $ 0     $ 0   $ 0
Provision (reversal of provision) for credit losses 0   $ 0 0 $ 0  
HTM securities allowance for credit loss 0     0    
AFS and HTM debt securities carrying value 9,784,021,000     9,784,021,000    
Asset Pledged as Collateral            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
AFS and HTM debt securities carrying value $ 1,220,000,000     $ 1,220,000,000   $ 803,900,000
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Number of available-for-sale debt securities in an unrealized loss position | security 262     262   180
Non-agency mortgage-backed securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Number of available-for-sale debt securities in an unrealized loss position | security 100     100    
Corporate debt securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Available-for-sale debt securities fair value, Total $ 529,565,000     $ 529,565,000   $ 435,410,000
Number of available-for-sale debt securities in an unrealized loss position | security 68     68   30
U.S. government-sponsored enterprises debt securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Available-for-sale debt securities fair value, Total $ 260,424,000     $ 260,424,000   $ 1,176,554,000
Number of available-for-sale debt securities in an unrealized loss position | security           50
U.S. Treasury securities            
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]            
Available-for-sale debt securities fair value, Total $ 600,677,000     $ 600,677,000   $ 983,657,000
Number of available-for-sale debt securities in an unrealized loss position | security           21