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Investment Securities - Securities Pledged as Collateral (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | $ 7,731,217 | $ 8,189,780
Asset Pledged as Collateral [Member] |  |
Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | 2,600 | 2,600
Asset Pledged as Collateral [Member] | Public Funds Deposits |  |
Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | 1,800 | 1,900
Asset Pledged as Collateral [Member] | FHLB Advances |  |
Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | 716,300 | 596,100
Asset Pledged as Collateral [Member] | Interest rate swap |  |
Investment Securities |  |
Carrying amount of the securities pledged to collateralize repurchase agreements | $ 108,300 | $ 114,900

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