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Securities Securities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2022
Mar. 31, 2020
Sep. 30, 2018
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]                
Available-for-sale securities transferred to Held-to-Maturity     $ 1,100,000 $ 873,600 $ 179,800 $ 0 $ 1,059,737  
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 $ 196,000         196,000    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 405,912         405,912   $ 325,426
Debt Securities, Available-for-sale, Unrealized Loss Position 3,602,111         3,602,111   $ 3,007,832
Sales 129,600 $ 26,600       303,145 29,501  
Debt Securities, Available-for-Sale, Realized Gain 289 292       302 292  
Debt Securities, Available-for-sale, Realized Loss 10,000 $ 76       20,000 $ 136  
Securities pledged as collateral                
Debt Securities, Available-for-sale [Line Items]                
Financial Instruments, Owned, at Fair Value 1,900,000         1,900,000    
Securities pledged as collateral                
Debt Securities, Available-for-sale [Line Items]                
Secured borrowing under agreement to repurchase $ 196,000         $ 196,000