Borrowings - Borrowings by contractual maturities (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Debt Instrument [Line Items]
2024	$ 137,033
2025	144,214
2026	74,500
2028	438,636
Later years	238,010
Total borrowings	1,032,393
Assets sold under agreements to repurchase
Debt Instrument [Line Items]
2024	66,090
2025	0
2026	0
2028	0
Later years	0
Total borrowings	66,090
Notes payable
Debt Instrument [Line Items]
2024	70,943
2025	144,214
2026	74,500
2028	438,636
Later years	238,010
Total borrowings	$ 966,303