Fair Value Measurement and Fair Value of Financial Instruments - Fair Value of Assets Measured on Non-recurring Basis (Detail) - Fair Value, Measurements, Non-recurring - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Individually evaluated loans	$ 0	$ 4,489
(Level 1)
Assets:
Individually evaluated loans	0	0
(Level 2)
Assets:
Individually evaluated loans	0	0
(Level 3)
Assets:
Individually evaluated loans	$ 0	$ 4,489