Annual report pursuant to Section 13 and 15(d)

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

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Borrowings - Summary of Financial Data Pertaining to Federal Home Loan Bank Advances (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Federal Home Loan Banks [Abstract]      
Weighted-average interest rate at end of year 1.05% 1.40% 1.70%
Weighted-average interest rate during the year 1.17% 1.42% 1.89%
Average balance of FHLB advances $ 145,277,000 $ 156,601,000 $ 40,374,000
Maximum amount outstanding at any month-end $ 162,500,000 $ 300,000,000 $ 285,000,000