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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) | Mar. 31, 2020 | Jun. 30, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Held-to-maturity Securities | $ 0 |
Accrued interest receivable for investment securities | 7,100,000 |
Threshold Net Book Balance, Individually Evaluated Loans | 250,000 |
Interest Receivable | 30,200,000 |
Liability Recorded for Expected Credit Losses on Unfunded Commitments | $ 8,600,000 |
Other Assets |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Interest Receivable |  | $ 30,200,000
Other Liabilities |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Liability Recorded for Expected Credit Losses on Unfunded Commitments |  | $ 8,600,000

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