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Stock-based Compensation - Summary of ESOP Shares (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Allocated shares 164,634 145,389
Shares committed for release 4,811 19,245
Unearned shares 187,639 192,450
Total ESOP shares 357,084 357,084
Fair value of unearned ESOP shares [1] $ 4,258 $ 4,388
[1] Based on closing price of $22.69 and $22.80 per share on September 30, 2021, and June 30, 2021, respectively.