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FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value on Recurring and Non-recurring Basis (Details) - USD ($) | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Transfers between levels of fair value hierarchy | $ 0 | $ 0
Available For Sale |  |
Mortgage-backed securities available for sale, at fair value | 1,017,029,000 | 453,607,000
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets, net | 2,077,000 | 9,957,000
Level 1 |  |
Available For Sale |  |
Total debt securities AFS | 0 | 0
Common equities and mutual funds | 12,668,000 | 2,969,000
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Level 2 |  |
Available For Sale |  |
Total debt securities AFS | 1,864,899,000 | 1,268,102,000
Common equities and mutual funds | 0 | 0
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Level 3 |  |
Available For Sale |  |
Total debt securities AFS | 0 | 0
Common equities and mutual funds | 0 | 0
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 3,616,646,000 | 3,307,037,000
Recurring |  |
Available For Sale |  |
Corporate securities | 25,000,000 |
SBA securities | 157,209,000 | 164,955,000
Obligations of states and political subdivisions | 2,507,000 | 841,000
Non-bank qualified obligations of states and political subdivisions | 268,295,000 | 323,774,000
Asset-backed securities | 394,859,000 | 324,925,000
Mortgage-backed securities available for sale, at fair value | 1,017,029,000 | 453,607,000
Total debt securities AFS | 1,864,899,000 | 1,268,102,000
Common equities and mutual funds | 12,668,000 | 2,969,000
Investment securities available for sale, at fair value | 4,560,000 | 2,784,000
Recurring | Level 1 |  |
Available For Sale |  |
Corporate securities | 0 |
SBA securities | 0 | 0
Obligations of states and political subdivisions | 0 | 0
Non-bank qualified obligations of states and political subdivisions | 0 | 0
Asset-backed securities | 0 | 0
Mortgage-backed securities available for sale, at fair value | 0 | 0
Total debt securities AFS | 0 | 0
Common equities and mutual funds | 12,668,000 | 2,969,000
Investment securities available for sale, at fair value | 0 | 0
Recurring | Level 2 |  |
Available For Sale |  |
Corporate securities | 25,000,000 |
SBA securities | 157,209,000 | 164,955,000
Obligations of states and political subdivisions | 2,507,000 | 841,000
Non-bank qualified obligations of states and political subdivisions | 268,295,000 | 323,774,000
Asset-backed securities | 394,859,000 | 324,925,000
Mortgage-backed securities available for sale, at fair value | 1,017,029,000 | 453,607,000
Total debt securities AFS | 1,864,899,000 | 1,268,102,000
Common equities and mutual funds | 0 | 0
Investment securities available for sale, at fair value | 0 | 0
Recurring | Level 3 |  |
Available For Sale |  |
Corporate securities | 0 |
SBA securities | 0 | 0
Obligations of states and political subdivisions | 0 | 0
Non-bank qualified obligations of states and political subdivisions | 0 | 0
Asset-backed securities | 0 | 0
Mortgage-backed securities available for sale, at fair value | 0 | 0
Total debt securities AFS | 0 | 0
Common equities and mutual funds | 0 | 0
Investment securities available for sale, at fair value | 0 | 0
Nonrecurring |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 14,852,000 | 19,217,000
Nonrecurring | National Lending |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 3,404,000 | 9,240,000
Nonrecurring | Community Banking |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 9,371,000 | 20,000
Nonrecurring | Impaired Loans |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 12,775,000 | 9,260,000
Nonrecurring | Foreclosed Assets |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets, net | 2,077,000 | 9,957,000
Nonrecurring | Level 1 |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 1 | National Lending |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 1 | Community Banking |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 1 | Impaired Loans |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 1 | Foreclosed Assets |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets, net | 0 | 0
Nonrecurring | Level 2 |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 2 | National Lending |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 2 | Community Banking |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 2 | Impaired Loans |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 0 | 0
Nonrecurring | Level 2 | Foreclosed Assets |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets, net | 0 | 0
Nonrecurring | Level 3 |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 14,852,000 | 19,217,000
Nonrecurring | Level 3 | National Lending |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 3,404,000 | 9,240,000
Nonrecurring | Level 3 | Community Banking |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 9,371,000 | 20,000
Nonrecurring | Level 3 | Impaired Loans |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Loans and leases | 12,775,000 | 9,260,000
Nonrecurring | Level 3 | Foreclosed Assets |  |
Fair value of assets measured on non-recurring basis [Abstract] |  |
Foreclosed real estate and repossessed assets, net | $ 2,077,000 | $ 9,957,000

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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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