Annual report [Section 13 and 15(d), not S-K Item 405]

INVESTMENT SECURITIES - Schedule of amortized cost, unrealized gains and losses accumulated in other comprehensive income, and fair value of available-for-sale securities (Details)

v3.26.1
INVESTMENT SECURITIES - Schedule of amortized cost, unrealized gains and losses accumulated in other comprehensive income, and fair value of available-for-sale securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Mar. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Assets measured at amortized cost $ 570,844 $ 477,156
Recognized impairment loss in Income Statement (376) (406)
Unrealized gain/(loss) accumulated in other comprehensive income/(loss) including foreign currency translation adjustments, net 3,570 (3,163)
Total available-for-sale securities, at fair value 574,038 473,587
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Assets measured at amortized cost 304,548 243,660
Recognized impairment loss in Income Statement 0 (28)
Unrealized gain/(loss) accumulated in other comprehensive income/(loss) including foreign currency translation adjustments, net 7,056 98
Total available-for-sale securities, at fair value 311,604 243,730
Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Assets measured at amortized cost 244,312 211,628
Recognized impairment loss in Income Statement (376) (378)
Unrealized gain/(loss) accumulated in other comprehensive income/(loss) including foreign currency translation adjustments, net (3,483) (3,019)
Total available-for-sale securities, at fair value 240,453 208,231
U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Assets measured at amortized cost 21,984 21,868
Recognized impairment loss in Income Statement 0 0
Unrealized gain/(loss) accumulated in other comprehensive income/(loss) including foreign currency translation adjustments, net (3) (242)
Total available-for-sale securities, at fair value $ 21,981 $ 21,626