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Securities - Narrative (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
security
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
security
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
AFS and HTM, accrued interest $ 39,100,000   $ 41,800,000
Available-for-sale debt securities fair value, Total $ 6,101,391,000   $ 5,783,741,000
Number of available-for-sale debt securities in an unrealized loss position | security 555   559
Debt Securities, AFS, allowance for credit loss $ 0   $ 0
Provision (reversal of provision) for credit losses 0 $ 0  
HTM securities allowance for credit loss 0    
Asset Pledged as Collateral      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
AFS and HTM debt securities carrying value $ 7,340,000,000   $ 794,200,000
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 259   263
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 $ 516,253,000   $ 526,274,000
Number of available-for-sale debt securities in an unrealized loss position | security 67   68
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 $ 463,860,000   $ 311,539,000
U.S. Treasury securities      
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]      
Available-for-sale debt securities fair value, Total $ 818,455,000   $ 606,203,000
Number of available-for-sale debt securities in an unrealized loss position | security 17   15