Commitments and Contingencies - Additional Information (Detail) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Outstanding commitments	$ 112,410,000	$ 87,337,000
Commitments to Extend Credit [Member] | Accounting Standards Update 2016-13 [Member]
Loss Contingencies [Line Items]
Outstanding commitments	56,700,000
Establishment of allowance for credit losses unfunded loan commitment	1,000,000
Mortgage Partnership Finance Program [Member]
Loss Contingencies [Line Items]
Commitments	4,200,000
Other commitments	$ 0	$ 0