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Disclosures about Fair Value of Assets - Quantitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements (Detail)
6 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
yr
Jun. 30, 2022
USD ($)
$ / pure
mo
yr
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights $ 1,515,000 $ 1,463,000
Impaired loans (collateral dependent) $ 2,361,000 $ 2,662,000
Discount Rate [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 9.5 9.5
Minimum [Member] | Constant Prepayment Rate [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 6 6
Minimum [Member] | Probability of Default [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 0.1 0.1
Minimum [Member] | Maturity/Call Date [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 1 1
Minimum [Member] | Weighted average coupon [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 2.97 2.97
Minimum [Member] | Marketability yield adjustment [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 1 1
Maximum [Member] | Constant Prepayment Rate [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 6.8 6.7
Maximum [Member] | Probability of Default [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 0.14 0.14
Maximum [Member] | Maturity/Call Date [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input | yr 9 10
Maximum [Member] | Weighted average coupon [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 3.08 3.08
Maximum [Member] | Marketability yield adjustment [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 2 2
Weighted Average [Member] | Discount Rate [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 9.5 9.5
Weighted Average [Member] | Constant Prepayment Rate [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 6.6 6.7
Weighted Average [Member] | Probability of Default [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 0.12 0.12
Weighted Average [Member] | Weighted average coupon [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 3.03 3.03
Weighted Average [Member] | Marketability yield adjustment [Member] | Discounted Cash Flow [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Mortgage servicing rights, measurement input 1.6 1.6