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Securities - Fair Value and Amortized Cost of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value |  |
Pledge securities for borrowing availability at the Federal Reserve | $ 851,384 | $ 1,441,920
Pledge securities for FHLB borrowings | 279,136 | 0
Amortized Cost [Abstract] |  |
Pledge securities for borrowing availability at the Federal Reserve | 1,032,916 | 1,682,935
Pledge securities for FHLB borrowings | $ 333,613 | $ 0

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