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Benefit Plans - Schedule of Expected Benefit Payments (Detail)
Jun. 30, 2019
USD ($)
Atlas Bank Retirement Income Plan ("ABRIP") [Member]  
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 $ 142,000
2021 142,000
2022 142,000
2023 140,000
2024 138,000
2025-2029 679,000
Benefit Equalization Plan ("BEP") [Member]  
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 234,000
2021 233,000
2022 231,000
2023 228,000
2024 226,000
2025-2029 1,071,000
Postretirement Welfare Plan [Member]  
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 30,000
2021 29,000
2022 37,000
2023 44,000
2024 53,000
2025-2029 336,000
Directors' Consultation and Retirement Plan ("DCRP") [Member]  
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]  
2020 84,000
2021 47,000
2022 73,000
2023 128,000
2024 146,000
2025-2029 $ 1,069,000