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Investment Securities - Securities Pledged as Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | $ 7,344,483 | $ 8,189,780
Asset Pledged as Collateral [Member] |  |
Investment Securities |  |
Investment securities market value | 2,500,000 | 2,700,000
Carrying amount of the securities pledged to collateralize repurchase agreements | 2,800,000 | 2,900,000
Asset Pledged as Collateral [Member] | Public Funds Deposits |  |
Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | 2,000,000 | 2,100,000
Asset Pledged as Collateral [Member] | FHLB Advances |  |
Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | 651,900 | 630,000
Asset Pledged as Collateral [Member] | Interest rate swap |  |
Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | $ 133,500 | $ 149,200

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