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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value Hedges | Interest-bearing deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment | $ (1,056) | $ (15,078) | $ (12,645) | $ (15,480) |
Fair Value Hedges | Long-term debt |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment | 3,169 | $ (14,490) | (19,158) | $ (13,486) |
Interest Rate Contract | Interest-bearing deposits | Derivatives Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment |  |  | 0 |  | $ 0
Interest Rate Contract | Long-term debt | Derivatives Not Designated as Hedging Instruments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Hedge Accounting Basis Adjustment |  |  | 5,713 |  | 9,809
Interest Rate Contract | Fair Value Hedges | Interest-bearing deposits | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Carrying Amount of Assets/(Liabilities) | (950,000) |  | (950,000) |  | (1,050,000)
Hedge Accounting Basis Adjustment |  |  | (8,353) |  | 4,292
Interest Rate Contract | Fair Value Hedges | Long-term debt | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Carrying Amount of Assets/(Liabilities) | $ (699,565) |  | (699,565) |  | (1,048,535)
Hedge Accounting Basis Adjustment |  |  | $ (7,572) |  | $ 11,585

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- Definition Amount of liability hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE + Details
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- Definition Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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