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Disclosures About Fair Value of Assets - Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements Recognized in Accompanying Balance Sheet (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 3,843 $ 4,125
Transfers into Level 3 64 89
Transfers out of Level 3 (75) (171)
Total realized and unrealized gains and losses included in net income (61) 101
Settlements (303) (301)
Ending Balance 3,468 3,843
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date (61) 101
Obligations of State and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 2,361 2,662
Settlements (303) (301)
Ending Balance 2,058 2,361
Mortgage Servicing Rights [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 1,482 1,463
Transfers into Level 3 64 89
Transfers out of Level 3 (75) (171)
Total realized and unrealized gains and losses included in net income (61) 101
Ending Balance 1,410 1,482
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date $ (61) $ 101