FHLB Advances and Other Borrowings - Summary of FHLB Advances (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Federal Home Loan Bank, Advances [Line Items]
FHLB Advances, total	$ 17,623	$ 30,010
Open Line of Credit [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.77%	2.61%
FHLB Advances, total		$ 5,350
Fixed Rate Fixed Term Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.41%
FHLB Advances, total	$ 7,000	$ 24,000
Putable Advance [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.03%
FHLB Advances, total	$ 10,000
Advance Structured Note [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	7.47%	7.47%
FHLB Advances, total	$ 623	$ 660
Minimum [Member] | Fixed Rate Fixed Term Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate		1.13%
Maximum [Member] | Fixed Rate Fixed Term Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate		1.50%