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Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Reclassification of Securities available for sale to securities held to maturity         $ 766,000,000
Net unrealized holding loss on AFS Securities at date of transfer         91,900,000
Net unrealized holding losses on AFS Securities, net of tax at date of transfer         $ 68,900,000
Net unamortized, unrealized loss on transfer of securities $ 52,100,000 $ 52,100,000   $ 57,600,000  
Securities available for sale $ 1,621,659,000 $ 1,621,659,000   1,762,878,000  
Available for sale securities, average yield 4.85% 4.85%      
Gross realized gains $ 182,800,000        
Net unamortized, unrealized loss on transfer of securities, net of tax (137,100,000) $ (137,100,000)      
Purchases of securities available for sale 1,378,000,000 1,382,457,000 $ 0    
Credit loss recognized 0 0   0  
Potential credit loss exposure       340,000  
Expected credit losses, current.   0      
Reserve for securities held to maturity 0 0   0  
Securities held to maturity 1,380,487,000 1,380,487,000   1,426,279,000  
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law 2,276,000,000 2,276,000,000   2,321,000,000  
Pledged securities providing additional contingency funding 0 0   0  
30 Days or More Past Due [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Securities held to maturity 0 0   0  
Securities Available for Sale [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable 4,100,000 4,100,000   3,700,000  
Securities Held to Maturity [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Accrued interest receivable 2,500,000 2,500,000   2,600,000  
Held-to-maturity nonnaccrual 0 0   $ 0  
Investment Securities Portfolio [Member]          
Schedule of Available For Sale and Held to Maturity Securities [Line Items]          
Securities available for sale $ 1,561,000,000 $ 1,561,000,000      
Available for sale securities, average yield 1.36% 1.36%