Commitments and Contingencies (Reserve for Unfunded Commitments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Jun. 30, 2023	May 22, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Proposed annual rate			0.125%
Forecast
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Estimated Special Assessment Charge	$ 44,000
SEC Schedule, 12-09, Allowance, Credit Loss
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount		$ 22,400		$ 27,700