Securities - Securities Pledged as Collateral (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 8,014,663	$ 8,189,780
Asset Pledged as Collateral [Member]
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	2,400,000	2,600,000
Asset Pledged as Collateral [Member] | Public Funds Deposits
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	1,900,000	1,900,000
Asset Pledged as Collateral [Member] | FHLB Advances
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	415,700	596,100
Asset Pledged as Collateral [Member] | Interest rate swap
Investment Securities
Carrying amount of the securities pledged to collateralize repurchase agreements	$ 113,200	$ 114,900