Quarterly report pursuant to Section 13 or 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 ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Federal Home Loan Banks [Abstract]    
Weighted-average interest rate at end of period 1.63% 1.70%
Weighted-average interest rate during the period 1.39% 1.89%
Average balance of FHLB advances $ 163,269,000 $ 40,374,000
Maximum amount outstanding at any month-end $ 300,000,000 $ 285,000,000