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Derivative Instruments and Hedging Activities - Schedule of Carrying Amount and Associated Cumulative Basis Adjustment Related to the Application of Hedge Accounting (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Fair Value Hedges | Interest-bearing deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment | $ (15,078) | $ (1,072) | $ (15,480) | $ 7,224 |
Fair Value Hedges | Long-term debt |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment | (14,490) | $ 939 | (13,486) | $ 6,365 |
Interest Rate Contract | Interest-bearing deposits | Derivatives Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment |  |  | 62 |  | $ 1,267
Interest Rate Contract | Long-term debt | Derivatives Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment |  |  | 11,175 |  | 9,638
Interest Rate Contract | Fair Value Hedges | Interest-bearing deposits | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Carrying Amount of Assets/(Liabilities) | (1,125,933) |  | (1,125,933) |  | (2,013,504)
Hedge Accounting Basis Adjustment |  |  | 36 |  | (8,711)
Interest Rate Contract | Fair Value Hedges | Long-term debt | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Carrying Amount of Assets/(Liabilities) | $ (551,399) |  | (551,399) |  | (546,872)
Hedge Accounting Basis Adjustment |  |  | $ (124) |  | $ (5,986)

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