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Investment Securities - Textual (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
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, unrealized gain (loss) (151,900,000) $ 791,000              
Available-for-sale, transfer to held-to-maturity, gain (loss)       $ 0          
Held to maturity mortgage backed securities 3,821,063,000     3,821,063,000     $ 1,530,500,000    
Available for sale mortgage backed securities 4,730,178,000     4,730,178,000     7,130,861,000    
Held-to-maturity, interest receivable 15,400,000     15,400,000          
Available-for-sale, interest receivable 20,500,000     20,500,000          
Available-for-sale securities 4,341,647,000     4,341,647,000     7,113,545,000    
Securities valued at less than historical cost, amount $ 4,199,774,000     $ 4,199,774,000          
Securities valued at less than historical cost (as percent) 96.70%     96.70%          
Securities - AFS $ 0   $ (2,454,000) $ 0 $ (312,000)        
Net decrease in allowance on previously impaired securities     (2,454,000)   (301,000)        
Provision for credit losses     (2,454,000)   (312,000)        
Allowance for credit losses on HTM 1,381,000   1,132,000 1,381,000 1,132,000 $ 1,377,000 1,279,000 $ 1,618,000 $ 2,915,000
Securities pledged as collateral 4,160,000,000     4,160,000,000     3,880,000,000    
Realized gains     5,200,000 37,000 10,600,000        
Realized losses (150,000)   (26,000) $ (240,000) $ (39,000)        
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 152,200,000     $ 152,200,000     4,900,000    
Available for sale mortgage backed securities 1,310,000,000     1,310,000,000     1,530,000,000    
Residential Mortgage Backed Securities                  
Debt Securities, Available-for-sale [Line Items]                  
Held to maturity mortgage backed securities 1,090,000,000.00     1,090,000,000.00     65,500,000    
Available for sale mortgage backed securities 1,660,000,000     1,660,000,000     2,920,000,000    
State and political subdivisions                  
Debt Securities, Available-for-sale [Line Items]                  
Held to maturity mortgage backed securities 1,869,027,000     1,869,027,000     1,210,248,000    
Available for sale mortgage backed securities 1,103,260,000     1,103,260,000     1,791,097,000    
Available-for-sale securities 915,255,000     915,255,000     1,819,658,000    
Securities valued at less than historical cost, amount 865,110,000     865,110,000          
Net decrease in allowance on previously impaired securities     (64,000)   $ (217,000)        
Allowance for credit losses on HTM 103,000   $ 871,000 103,000 $ 871,000 $ 1,285,000 $ 1,197,000 $ 1,042,000 $ 2,307,000
State and political subdivisions | Other Credit Enhancement or Insurance                  
Debt Securities, Available-for-sale [Line Items]                  
Held to maturity mortgage backed securities 951,369,000     951,369,000          
Allowance for credit losses on HTM $ 0     $ 0