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Fair Value of Financial Instruments - Additional Information (Detail)
12 Months Ended
Jun. 30, 2019
USD ($)
Security
Jun. 30, 2018
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale, Fair value $ 544,333,000  
Pipeline of loans held-for-sale 46,200,000  
Assets, Fair Value 718,119,000 $ 756,966,000
Financing receivable, allowance for credit losses, individually evaluated for impairment 31,000 306,000
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, Fair Value 3,878,000 4,469,000
Debt Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale, Fair value 544,333,000 590,562,000
Loan Origination Commitments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Pipeline of loans held-for-sale 46,200,000 10,800,000
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, Fair Value 1,000,000 1,000,000
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Financing receivable, allowance for credit losses, individually evaluated for impairment 31,000 306,000
Loans and Leases Receivable, Gross 3,900,000 4,800,000
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, Fair Value 3,878,000 4,469,000
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Assets, Fair Value $ 0 0
Significant Unobservable Inputs (Level 3) [Member] | Debt Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Number of trust preferred securities | Security 1  
Securities available for sale, Fair value $ 1,000,000 $ 1,000,000
Significant Unobservable Inputs (Level 3) [Member] | Debt Securities [Member] | One Trust Preferred Security [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale, Fair value $ 1,000,000