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Changes in Accumulated Other Comprehensive Income (AOCI) by Component - Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gains on available-for-sale securities $ 204 $ 1
Tax expense 512 415
Net Income 1,331 1,100
Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassified amount before tax 206 6
Tax expense 59 2
Net Income 147 4
Accumulated Net Realized Investment Gains (Losses) [Member] | Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gains on available-for-sale securities 204 1
Amortization of Defined Benefit Pension Items [Member] | Amounts Reclassified from AOCI [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Actuarial losses $ 2 $ 5