FHLB Advances and Other Borrowings - Summary of Federal Home Loan Bank Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Federal Home Loan Bank, Advances [Line Items]
FHLB Advances, total	$ 68,398	$ 17,623
Fixed rate, COVID-19 Relief Advance, maturing May 2021 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	0.00%
FHLB Advances, total	$ 4,000
Fixed rate, fixed term advance, maturing July 2021 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.41%	1.41%
FHLB Advances, total	$ 7,000	$ 7,000
Fixed rate, fixed term advance, maturing February 2022 [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 February 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.62%
FHLB Advances, total	$ 6,500
Putable advance, maturing October 2029 first option date Nov 2020 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.03%	1.03%
FHLB Advances, total	$ 10,000	$ 10,000
Putable advance, maturing February 2030 first option date Feb 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	0.98%
FHLB Advances, total	$ 5,000
Putable advance, maturing March 2030 first option date March 2025 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	0.89%
FHLB Advances, total	$ 10,000
Advance structured note, payments due monthly, maturing February 2030 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	7.47%	7.47%
FHLB Advances, total	$ 584	$ 623
Advance structured note, payments due monthly, maturing April 2030 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.05%
FHLB Advances, total	$ 9,365
Advance structured note, payments due monthly, maturing May 2030 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.19%
FHLB Advances, total	$ 9,449