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Securities Securities - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2018
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]              
Securities pledged as collateral to secure public funds and other deposits or securities sold under agreements to repurchase $ 649,500,000       $ 649,500,000    
Secured borrowing under agreement to repurchase 148,200,000       148,200,000    
Available-for-sale securities transferred to Held-to-Maturity     $ 873,600,000 $ 179,800,000 0 $ 873,613,000  
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio     69,000,000 (2,200,000)      
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 29,921,000       29,921,000   $ 17,837,000
Debt Securities, Available-for-sale, Unrealized Loss Position 2,055,076,000       2,055,076,000   871,433,000
Available-for-sale securities transferred to held-to-maturity portfolio     $ 873,600,000 $ 179,800,000 0 873,613,000  
Allowance for credit losses - securities held-to-maturity (161,000)       (161,000)   $ (191,000)
Sales         2,240,000 145,631,000  
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 0 $ 481,000     270,000 $ 728,000  
Securities pledged as collateral              
Debt Securities, Available-for-sale [Line Items]              
Secured borrowing under agreement to repurchase $ 148,200,000       $ 148,200,000