Derivatives and Hedging Activity - Designated and Non-Designated Hedges (Details) € in Thousands, £ in Thousands, kr in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands	Mar. 31, 2026 USD ($) contract	Mar. 31, 2026 EUR (€) contract	Mar. 31, 2026 GBP (£) contract	Mar. 31, 2026 AUD ($) contract	Mar. 31, 2026 CHF (SFr) contract	Mar. 31, 2026 SEK (kr) contract
Derivatives
Number of Contracts	568	568	568	568	568	568
Foreign exchange contracts \| Long \| EUR
Derivatives
Number of Contracts	11	11	11	11	11	11
Aggregate Notional Amount \| €		€ 68,640
Foreign exchange contracts \| Long \| GBP
Derivatives
Number of Contracts	5	5	5	5	5	5
Aggregate Notional Amount \| £			£ 3,922
Foreign exchange contracts \| Long \| AUD
Derivatives
Number of Contracts	7	7	7	7	7	7
Aggregate Notional Amount \| $				$ 407,563
Foreign exchange contracts \| Short \| EUR
Derivatives
Number of Contracts	151	151	151	151	151	151
Aggregate Notional Amount \| €		€ 496,588
Foreign exchange contracts \| Short \| GBP
Derivatives
Number of Contracts	234	234	234	234	234	234
Aggregate Notional Amount \| £			£ 437,146
Foreign exchange contracts \| Short \| AUD
Derivatives
Number of Contracts	75	75	75	75	75	75
Aggregate Notional Amount \| $				$ 1,111,559
Foreign exchange contracts \| Short \| CHF
Derivatives
Number of Contracts	5	5	5	5	5	5
Aggregate Notional Amount \| SFr					SFr 11,443
Foreign exchange contracts \| Short \| SEK
Derivatives
Number of Contracts	35	35	35	35	35	35
Aggregate Notional Amount \| kr						kr 364,058
Interest rate swaps – Paying fixed rates \| USD
Derivatives
Number of Contracts	24	24	24	24	24	24
Aggregate Notional Amount \| $	$ 1,580,284
Interest rate swaps – Receiving fixed rates \| USD
Derivatives
Number of Contracts	8	8	8	8	8	8
Aggregate Notional Amount \| $	$ 3,313,380
Interest rate futures \| USD
Derivatives
Number of Contracts	8	8	8	8	8	8
Aggregate Notional Amount \| $	$ 128,000
Interest rate caps \| USD
Derivatives
Number of Contracts	3	3	3	3	3	3
Aggregate Notional Amount \| $	$ 509,000
Credit instruments \| USD
Derivatives
Number of Contracts	2	2	2	2	2	2
Aggregate Notional Amount \| $	$ 90,000