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Loan Quality and Allowance for Loan Losses - Troubled Debt Restructurings of Loans Receivable (Detail) $ in Thousands | 9 Months Ended
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Mar. 31, 2019 USD ($) Loan | Mar. 31, 2018 USD ($) Loan
Financing Receivable Modifications [Line Items] |  |
Number of loans | Loan | 12 | 8
Pre-modification outstanding recorded investment | $ 5,692 | $ 1,908
Post-modification outstanding recorded investment | 5,752 | 2,214
Reserves included in and charge offs against the allowance for loan loss recognized at modification | $ 4 | $ 153
Residential Mortgage [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans | Loan | 5 | 5
Pre-modification outstanding recorded investment | $ 1,267 | $ 1,521
Post-modification outstanding recorded investment | 1,309 | 1,813
Reserves included in and charge offs against the allowance for loan loss recognized at modification | $ 2 | $ 145
Non-Residential Mortgage [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans | Loan | 1 | 2
Pre-modification outstanding recorded investment | $ 2,957 | $ 315
Post-modification outstanding recorded investment | 2,955 | 330
Reserves included in and charge offs against the allowance for loan loss recognized at modification | $ 2 | $ 7
Commercial Business [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans | Loan | 6 |
Pre-modification outstanding recorded investment | $ 1,468 |
Post-modification outstanding recorded investment | $ 1,488 |
Home Equity Loans [Member] |  |
Financing Receivable Modifications [Line Items] |  |
Number of loans | Loan |  | 1
Pre-modification outstanding recorded investment |  | $ 72
Post-modification outstanding recorded investment |  | 71
Reserves included in and charge offs against the allowance for loan loss recognized at modification |  | $ 1

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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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