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Investment Securities - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]            
Debt securities, available-for-sale, transfer to held-to-maturity   $ 1,990,000,000   $ 500,800,000    
Debt securities, held-to-maturity transfer, unrealized loss $ 141,000,000          
Available-for-sale, transfer to held-to-maturity, gain (loss) 0          
Held to maturity mortgage backed securities 3,767,371,000       $ 3,761,094,000  
Available for sale mortgage backed securities 4,186,431,000       4,331,413,000  
Held-to-maturity, interest receivable 17,400,000          
Available-for-sale, interest receivable 16,700,000          
Available-for-sale securities 3,755,956,000       3,852,854,000  
Securities valued at less than historical cost, amount $ 3,682,848,000          
Securities valued at less than historical cost (as percent) 98.10%          
Securities - AFS $ 12,800,000   $ 0      
Held-to-maturity, allowance for credit losses 1,888,000   1,377,000   1,388,000 $ 1,279,000
Securities pledged as collateral 3,820,000,000       3,960,000,000  
Realized gains 0   37,000      
Realized losses $ 0   $ 91,000      
Income tax benefit related to security gains (losses) (as percent) 26.135%   26.135%      
Commercial Mortgage Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity mortgage backed securities $ 146,500,000       149,200,000  
Available for sale mortgage backed securities 985,700,000       1,070,000,000.00  
Residential Mortgage Backed Securities            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity mortgage backed securities 1,050,000,000.00       1,040,000,000.00  
Available for sale mortgage backed securities 1,450,000,000       1,470,000,000  
State and political subdivisions            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity mortgage backed securities 1,860,332,000       1,861,102,000  
Available for sale mortgage backed securities 1,060,198,000       1,056,124,000  
Available-for-sale securities 895,896,000       871,074,000  
Securities valued at less than historical cost, amount 861,619,000          
Held-to-maturity, allowance for credit losses 362,000   $ 1,285,000   $ 110,000 $ 1,197,000
State and political subdivisions | Other Credit Enhancement or Insurance            
Debt Securities, Available-for-sale [Line Items]            
Held to maturity mortgage backed securities 987,246,000          
Held-to-maturity, allowance for credit losses $ 0