Federal Home Loan Bank Advances - Summary of Federal Home Loan Bank Advances (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Federal Home Loan Bank, Advances [Line Items]
FHLB Advances, total	$ 55,614	$ 17,623
Fixed Rate Fixed Term Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate		1.41%
FHLB Advances, total	$ 20,000	$ 7,000
Putable advance, maturing Oct 2029 first put 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 Feb 2030 first put 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 Mar 2030 first put option date Mar 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 Feb 2030 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	7.47%	7.47%
FHLB Advances, total	$ 614	$ 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	$ 10,000
Minimum [Member] | Fixed Rate Fixed Term Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.41%
Maximum [Member] | Fixed Rate Fixed Term Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB advances, interest rate	1.62%