Commitments - Loans (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Loan Commitments
Reserve balances	$ 0.0
Commitments to originate loans
Loan Commitments
Commitment amount	$ 1.3	$ 1.2
Commitments to originate loans | Minimum
Loan Commitments
Interest rate (as a percent)	6.75%	5.25%
Commitments to originate loans | Maximum
Loan Commitments
Interest rate (as a percent)	7.125%	5.50%
Unused lines of credit to borrowers
Loan Commitments
Commitment amount	$ 14.9	$ 14.4