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Loans and Leases - Aging Analysis of Accruing and Nonaccrual Modified Loans to Borrowers Experiencing Financial Difficult (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | $ 6,785,482 | $ 6,730,734
Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 16,462 | 20,150
Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 13,853 | 2,799
Current | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 16,462 | 18,250
Current | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 3,209 | 2,799
Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 | 1,900
Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 10,644 | 0
90 Days or more Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 | 0
90 Days or more Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 | 0
Commercial, financial and agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 996,612 | 1,044,043
Commercial, financial and agricultural | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 11,291 | 12,092
Commercial, financial and agricultural | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 1,485 |
Commercial, financial and agricultural | Current | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 11,291 | 12,092
Commercial, financial and agricultural | Current | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 1,485 |
Commercial, financial and agricultural | Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 | 0
Commercial, financial and agricultural | Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 |
Commercial, financial and agricultural | 90 Days or more Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 | 0
Commercial, financial and agricultural | 90 Days or more Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 |
Real estate-construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 309,365 | 285,616
Real estate-construction | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 5,171 |
Real estate-construction | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | 2,799
Real estate-construction | Current | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 5,171 |
Real estate-construction | Current | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | 2,799
Real estate-construction | Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 |
Real estate-construction | Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | 0
Real estate-construction | 90 Days or more Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 0 |
Real estate-construction | 90 Days or more Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | 0
Real estate-commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 3,517,803 | 3,442,083
Real estate-commercial | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | 8,058
Real estate-commercial | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 12,368 |
Real estate-commercial | Current | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | 6,158
Real estate-commercial | Current | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 1,724 |
Real estate-commercial | Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | 1,900
Real estate-commercial | Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | 10,644 |
Real estate-commercial | 90 Days or more Past Due | Accrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross |  | $ 0
Real estate-commercial | 90 Days or more Past Due | Nonaccrual Modified Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financial receivables, gross | $ 0 |

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