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Derivative Instruments and Hedging Activities (Schedule of the 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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Fair Value Hedges | Interest-bearing deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment | $ (1,072) | $ 17,523 | $ 7,224 | $ 20,341 |
Fair Value Hedges | Long-term debt |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment | 939 | $ 17,769 | 6,365 | $ 19,224 |
Interest Rate Contract | Interest-bearing deposits | Derivatives not designated as hedging instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment |  |  | 1,669 |  |
Interest Rate Contract | Long-term debt | Derivatives not designated as hedging instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment |  |  | 7,546 |  |
Interest Rate Contract | Fair Value Hedges | Interest-bearing deposits | Designated as hedging instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Carrying Amount of Assets/(Liabilities) | (2,073,504) |  | (2,073,504) |  | $ (1,680,000)
Hedge Accounting Basis Adjustment |  |  | 7,224 |  | 24,227
Interest Rate Contract | Fair Value Hedges | Long-term debt | Designated as hedging instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Carrying Amount of Assets/(Liabilities) | $ (695,562) |  | (695,562) |  | (545,787)
Hedge Accounting Basis Adjustment |  |  | $ 6,366 |  | $ 19,348

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