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Securities Securities - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2018
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities transferred to Held-to-Maturity $ 1,059,737,000 $ 0 $ 873,600,000 $ 179,800,000  
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio (1,500,000)   $ 69,000,000 $ (2,200,000)  
Secured borrowing under agreement to repurchase 219,500,000        
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 140,947,000       $ 32,686,000
Debt Securities, Available-for-sale, Unrealized Loss Position 2,703,299,000       $ 2,117,777,000
Sales 2,866,000 0      
Debt Securities, Available-for-sale, Realized Loss (61,000) $ 0      
Securities pledged as collateral          
Debt Securities, Available-for-sale [Line Items]          
Financial Instruments, Owned, at Fair Value 743,600,000        
Securities pledged as collateral          
Debt Securities, Available-for-sale [Line Items]          
Secured borrowing under agreement to repurchase $ 219,500,000