Commitments and Contingencies - Years In Which Commitments are Expected to be Paid (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	$ 76,598
2023
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	41,422
2024
Other Commitments [Line Items]
Commitments to contribute capital to small business investment companies and CRA-related loan pools	$ 35,176