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Borrowings - Information Regarding FHLB Advances Outstanding (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
[1]
Debt Instrument [Line Items]    
Total FHLB borrowings $ 25,000 $ 45,000
Federal Home Loan Bank Advances One | Convertible    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances, Non current $ 10,000  
Originated Feb. 28, 2020  
Stated Interest Rate 0.56%  
Maturity Date Feb. 28, 2030  
Federal Home Loan Bank Advances Two | Fixed Rate Credit    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances, Current $ 5,000  
Originated Sep. 08, 2020  
Stated Interest Rate 0.24%  
Maturity Date Oct. 08, 2020  
Federal Home Loan Bank Advances Three | Fixed Rate Credit    
Debt Instrument [Line Items]    
Federal Home Loan Bank advances, Current $ 10,000  
Originated Sep. 24, 2020  
Stated Interest Rate 0.22%  
Maturity Date Oct. 23, 2020  
[1] Derived from audited December 31, 2019 Consolidated Financial Statements.