Federal Home Loan Bank Advances - Summary of Federal Home Loan Bank Advances (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Federal Home Loan Bank, Advances [Line Items]
FHLB Advances, total	$ 78,499	$ 71,464
Fixed rate, fixed term advance, maturing February 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate		1.62%
FHLB Advances, total		$ 6,500
Fixed rate, fixed term advance, maturing July 2027 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	2.90%	2.90%
FHLB Advances, total	$ 5,000	$ 5,000
Putable advance, maturing July 2029 first option date January 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate		1.68%
FHLB Advances, total		$ 5,000
Putable advance, maturing February 2030, first option date February 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate		0.98%
FHLB Advances, total		$ 5,000
Putable advance, maturing October 2029, first put option date July 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate		2.96%
FHLB Advances, total		$ 5,000
Putable advance, maturing February 2028, first option date November 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	3.82%
FHLB Advances, total	$ 5,000
Putable advance, maturing May 2028, first option date November 2023 [Memebr]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	3.16%
FHLB Advances, total	$ 5,000
Putable advance, maturing January 2028, first option date January 2024 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	3.44%
FHLB Advances, total	$ 5,000
Putable advance, maturing February 2028, first option date February 2024 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	3.63%
FHLB Advances, total	$ 5,000
Putable advance, maturing March 2028, first option date March 2024 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	3.47%
FHLB Advances, total	$ 5,000
Putable advance, maturing May 2026, first option date May 2024
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	3.92%
FHLB Advances, total	$ 2,500
Putable advance, maturing May 2028, first option date May 2024
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	3.51%
FHLB Advances, total	$ 2,500
Putable advance, maturing Mar 2030, first put option date March 2025
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	0.89%	0.89%
FHLB Advances, total	$ 10,000	$ 10,000
Putable advance, maturing Mar 2032, first put option date March 2027
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.74%	1.74%
FHLB Advances, total	$ 10,000	$ 10,000
Advance structured note, payments due monthly, maturing April 2030 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.05%	1.05%
FHLB Advances, total	$ 6,701	$ 7,435
Advance structured note, payments due monthly, maturing May 2030 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.19%	1.19%
FHLB Advances, total	$ 6,798	$ 7,529
SOFR Floater advance, maturing October 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	5.56%	4.54%
FHLB Advances, total	$ 5,000	$ 5,000
SOFR Floater advance, maturing October 2024 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	5.61%	4.59%
FHLB Advances, total	$ 5,000	$ 5,000