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Commitment and Contingencies (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans in process | $ 2,207,880 | $ 2,232,836
Off-balance-sheet credit reserve | 30,000 | 27,500
Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans in process | $ 4,272,929 | $ 3,804,444

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