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Regulatory Matters - Association's Actual Capital Amounts and Ratios (Detail) - Association [Member]
$ in Thousands
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual, Community Bank Leverage Ratio, Amount $ 78,539 $ 76,428
Actual, Tier I capital (to adjusted total assets), Amount 78,539 76,428
Actual, Tangible capital (to adjusted total assets), Amount $ 78,539 $ 76,428
Actual, Community Bank Leverage Ratio, Ratio 0.1048 0.1068
Actual, Tier I capital (to adjusted total assets), Ratio 10.48% 10.68%
Actual, Tangible capital (to adjusted total assets), Ratio 0.1048 0.1068
Minimum Capital Requirement, Community Bank Leverage Ratio, Amount $ 63,685 $ 57,238
Minimum Capital Requirement, Tier I capital (to adjusted total assets), Amount 29,970 28,619
Minimum Capital Requirement, Tangible capital (to adjusted total assets), Amount $ 11,239 $ 10,732
Minimum Capital Requirement, Community Bank Leverage Ratio, Ratio 0.0850 0.0800
Minimum Capital Requirement, Tier I capital (to adjusted total assets), Ratio 4.00% 4.00%
Minimum Capital Requirement, Tangible capital (to adjusted total assets), Ratio 0.0150 0.0150
Minimum To Be Well Capitalised Under Prompt Corrective Action Provisions, Community Bank Leverage Ratio, Amount $ 63,685 $ 57,238
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Tier I capital (to adjusted total assets), Amount $ 37,462 $ 35,774
Minimum To Be Well Capitalised Under Prompt Corrective Action Provisions, Community Bank Leverage Ratio, Ratio 0.0850 0.0800
Minimum to Be Well Capitalized Under Prompt Corrective Action Provisions, Tier I capital (to adjusted total assets), Ratio 5.00% 5.00%