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Securities Securities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2022
Mar. 31, 2020
Sep. 30, 2018
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]                
Available-for-sale securities transferred to Held-to-Maturity     $ 1,100,000 $ 873,600 $ 179,800      
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio     $ 1,500 $ 69,000 $ (2,200)      
Secured borrowing under agreement to repurchase $ 258,500         $ 258,500    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 290,619         290,619   $ 221,614
Debt Securities, Available-for-sale, Unrealized Loss Position 4,888,552         4,888,552   $ 4,343,563
Sales 0 $ 822,700       188,486 $ 822,741  
Debt Securities, Available-for-Sale, Realized Gain   86       42 86  
Debt Securities, Available-for-sale, Realized Loss   $ 72,200       12,600 $ 72,200  
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0         0    
Securities pledged as collateral                
Debt Securities, Available-for-sale [Line Items]                
Financial Instruments, Owned, at Fair Value 4,000,000         4,000,000    
Securities pledged as collateral                
Debt Securities, Available-for-sale [Line Items]                
Secured borrowing under agreement to repurchase $ 258,500         $ 258,500