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Fair Value of Financial Instruments - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Detail) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Sep. 30, 2019

Jun. 30, 2019

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

$ 1,234,121

$ 718,119

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

3,975

3,878

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

3,157

3,071

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Non-Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

791

791

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Commercial Business [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

27

16

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

3,975

3,878

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

$ 3,157

$ 3,071

Valuation Techniques

^[1]

Market valuation of underlying collateral

Unobservable Input

^[2]

Adjustments to reflect current conditions/selling costs

Weighted Average

7.29%

7.03%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Non-Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

$ 791

$ 791

Valuation Techniques

^[1]

Market valuation of underlying collateral

Unobservable Input

^[2]

Adjustments to reflect current conditions/selling costs

Weighted Average

10.52%

10.08%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Commercial Business [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Assets, Fair Value

$ 27

$ 16

Valuation Techniques

^[1]

Market valuation of underlying collateral

Unobservable Input

^[2]

Adjustments to reflect current conditions/selling costs

Weighted Average

8.91%

9.36%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Minimum [Member] | Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Range

6.00%

6.00%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Minimum [Member] | Non-Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Range

10.00%

10.00%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Minimum [Member] | Commercial Business [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Range

8.00%

9.00%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Maximum [Member] | Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Range

8.00%

8.00%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Maximum [Member] | Non-Residential Mortgage [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Range

11.00%

11.00%

Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Market Valuation of Underlying Collateral [Member] | Adjustments to Reflect Current Conditions or Selling Costs [Member] | Maximum [Member] | Commercial Business [Member]

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]

Range

9.00%

10.00%

[1]	The fair value of impaired loans is generally determined based on an independent appraisal of the fair value of a loan’s underlying collateral.
[2]	The fair value basis of impaired loans is adjusted to reflect management’s estimates of selling costs including, but not necessarily limited to, real estate brokerage commissions and title transfer fees

X

- Definition

Percentage of collateral or property market value.

+ References

No definition available.

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X

- Definition

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+ References

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-SubTopic 10
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-Paragraph 2
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