Borrowings - Repurchase agreements accounted for as secured borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 54,833	$ 91,384
Secured Debt
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 54,833	$ 91,384
Repurchase liability weighted average interest rate	4.91%	5.59%
Secured Debt | US Treasury Securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 36,404	$ 43,592
Repurchase liability weighted average interest rate	4.92%	5.61%
Secured Debt | US Treasury Securities | Within 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 22,591	$ 16,931
Repurchase liability weighted average interest rate	5.04%	5.56%
Secured Debt | US Treasury Securities | After 30 to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 13,813	$ 18,369
Repurchase liability weighted average interest rate	4.71%	5.60%
Secured Debt | US Treasury Securities | After 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 0	$ 8,292
Repurchase liability weighted average interest rate	0.00%	5.73%
Secured Debt | Mortgage Backed Securities
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 18,429	$ 47,565
Repurchase liability weighted average interest rate	4.89%	5.58%
Secured Debt | Mortgage Backed Securities | Within 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 4,924	$ 27,171
Repurchase liability weighted average interest rate	4.90%	5.49%
Secured Debt | Mortgage Backed Securities | After 30 to 90 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 13,505	$ 20,394
Repurchase liability weighted average interest rate	4.88%	5.71%
Secured Debt | CMO
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 0	$ 227
Repurchase liability weighted average interest rate	0.00%	5.25%
Secured Debt | CMO | Within 30 days
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase liability	$ 0	$ 227
Repurchase liability weighted average interest rate	0.00%	5.25%