Long-Term Lease Obligations - Additional Information (Detail)		12 Months Ended
	Feb. 28, 2022 USD ($)	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Leases Disclosure [Line Items]
Rent expense		$ 871,300	$ 824,300	$ 799,500
Operating lease, right-of-use asset, statement of financial position	Other assets	Other assets
Operating lease, liability, statement of financial position	Other Liabilities	Other Liabilities
Lessor, operating lease, term of contract, additional extended period	60 months
Right-of-use asset	$ 3,800,000	$ 2,500,000
Operating lease liability	$ 3,800,000	$ 2,600,000
Flagship Center
Leases Disclosure [Line Items]
Number of developed parcels | property		2
90-year Ground Leasehold Interest
Leases Disclosure [Line Items]
Ground leasehold interest period		90 years
Minimum annual lease rent over lease term		$ 1
99-year Ground Lease
Leases Disclosure [Line Items]
Ground leasehold interest period		99 years
Minimum annual lease rent over lease term		$ 1
Percent of underlying land held under a 99-year ground lease		3.40%