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Securities Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2020
Sep. 30, 2018
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities transferred to Held-to-Maturity $ 0 $ 1,059,737 $ 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 149,800        
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 280,102       $ 325,426
Debt Securities, Available-for-sale, Unrealized Loss Position 2,996,213       $ 3,007,832
Sales 0 2,866      
Debt Securities, Available-for-sale, Realized Loss   $ 61      
Securities pledged as collateral          
Debt Securities, Available-for-sale [Line Items]          
Financial Instruments, Owned, at Fair Value 951,800        
Securities pledged as collateral          
Debt Securities, Available-for-sale [Line Items]          
Secured borrowing under agreement to repurchase $ 149,800