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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 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains (losses) on available-for-sale securities   $ (8) $ 204 $ (7)
Tax expense (credit) $ 571 372 1,083 787
Net Income 1,463 964 2,794 2,064
Amounts Reclassified from AOCI [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassified amount before tax 8 (3) 214 3
Tax expense (credit) 2 (1) 61 1
Net Income 6 (2) 153 2
Accumulated Net Realized Investment Gains (Losses) [Member] | Amounts Reclassified from AOCI [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gains (losses) on available-for-sale securities   (8) 204 (7)
Amortization of Defined Benefit Pension Items [Member] | Amounts Reclassified from AOCI [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial losses $ 8 $ 5 $ 10 $ 10