Quarterly report pursuant to Section 13 or 15(d)

Borrowings and Subordinated Debentures - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail)

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Borrowings and Subordinated Debentures - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Federal Home Loan Banks [Abstract]    
Weighted-average interest rate at end of period 1.20% 1.40%
Weighted-average interest rate during the period 1.29% 1.42%
Average balance of FHLB advances $ 150,000,000 $ 156,601,000
Maximum amount outstanding at any month-end $ 150,000,000 $ 300,000,000