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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, 2021 | Jun. 30, 2021
Pass |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | $ 12,100,000 | $ 3,200,000
Watch |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | 0 | 9,000,000.0
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 | 2,800,000 | 2,700,000
Doubtful |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
PCD loans receivable, net of ACL | $ 0 | $ 0

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- Definition Amount at purchase price of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919265-210447 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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