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Federal Home Loan Bank Advances - Schedule of Maturities of Borrowings Exclusive of Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Banks [Abstract]    
2022 $ 1,546  
2023 1,500  
2024 11,500  
2025 1,500  
Thereafter 1,980  
Total $ 18,026 $ 25,500