Derivatives and Hedging Activities - Number of positions and total notional amount of non-designated hedges and RPAs (Details) $ in Thousands	Sep. 30, 2026 USD ($) instrument	Dec. 31, 2025 USD ($) instrument
Derivatives and Hedging Activities
Notional Amount	$ 300,000	$ 300,000
Interest rate products
Derivatives and Hedging Activities
Notional Amount	300,000	300,000
Non-designated Hedges
Derivatives and Hedging Activities
Notional Amount	$ 597,477	$ 577,606
Non-designated Hedges \| Interest rate products
Derivatives and Hedging Activities
Number of derivative instruments held \| instrument	77	75
Notional Amount	$ 563,838	$ 532,972
Non-designated Hedges \| RPA credit contracts
Derivatives and Hedging Activities
Number of derivative instruments held \| instrument	16	17
Notional Amount	$ 33,639	$ 44,634

The number of derivative instruments of a particular group held by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 55
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477439/946-210-55-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
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-Section S99
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5A
-Subparagraph (SX 210.12-13A(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5A

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant