Borrowings - Borrowings by contractual maturities (Details) $ in Thousands	Sep. 30, 2024 USD ($)
Debt Instrument [Line Items]
2024	$ 77,733
2025	144,214
2026	74,500
2028	439,265
Later years	238,024
Total borrowings	973,736
Assets sold under agreements to repurchase
Debt Instrument [Line Items]
2024	55,360
2025	0
2026	0
2028	0
Later years	0
Total borrowings	55,360
Notes payable
Debt Instrument [Line Items]
2024	22,373
2025	144,214
2026	74,500
2028	439,265
Later years	238,024
Total borrowings	$ 918,376