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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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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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

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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

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