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Loans and Allowance for Credit Losses - Credit risk profile based on rating and payment activity (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Jun. 30, 2023
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | $ 36,400,000 | $ 37,400,000
Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | 11,800,000 | 12,700,000
Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | 0 | 0
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | 6,800,000 | 6,300,000
Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | $ 0 | $ 0

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