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Leases (Tables) | 12 Months Ended
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Sep. 30, 2021
Leases |
Schedule of components of lease costs | The components of lease costs are shown below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |  | Year Ended
​ | ​ | September 30, | ​ | September 30,
(Dollars in thousands) |  | 2021 |  | 2020
Finance lease cost: |  | ​ |  | ​ | ​ | ​
Amortization | ​ | $ | 2,413 | ​ | $ | 2,056
Interest on lease liabilities | ​ |  | 1,235 | ​ | ​ | 971
Operating lease cost | ​ |  | 5,879 | ​ | ​ | 5,284
Total lease cost | ​ | $ | 9,527 | ​ | $ | 8,311
Schedule of additional information related to leases | Additional information related to leases is shown below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Year Ended |  | Year Ended |
​ | ​ | September 30, | ​ | September 30, | ​
(Dollars in thousands) | ​ | 2021 | ​ | 2020 | ​
Cash paid for amounts included in the measurement of lease liabilities: | ​ | ​ | ​ |  | ​ |  |
Operating cash flows from operating leases | ​ | $ | 5,504 | ​ | $ | 5,223 |
Operating cash flows from finance leases | ​ | ​ | 1,228 | ​ |  | 971 |
Financing cash flows from finance leases | ​ | ​ | 1,757 | ​ |  | 1,547 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Right-of-use assets obtained in exchange for operating lease liabilities | ​ | $ | 15,609 | ​ | $ | 26,244 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term: | ​ | ​ | ​ | ​ |  |  |
Operating leases | ​ | ​ | 10.3 | yrs. |  | 6.0 | yrs.
Finance leases | ​ | ​ | 11.7 | yrs. |  | 12.5 | yrs.
Weighted-average discount rate: | ​ | ​ | ​ | ​ |  |  |
Operating leases | ​ | ​ | 3.1 | % |  | 3.1 | %
Finance leases | ​ | ​ | 4.2 | % |  | 4.3 | %
Schedule of reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets | The table below is a reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets, presented on our Consolidated Balance Sheet on September 30, 2021: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | Operating |  | Finance
Years Ending September 30: | ​ | Leases | ​ | Leases
2022 | ​ | $ | 5,448 |  | 3,153
2023 | ​ |  | 4,679 |  | 3,235
2024 | ​ |  | 4,032 |  | 3,319
2025 | ​ |  | 3,654 |  | 3,399
2026 and thereafter | ​ |  | 20,453 |  | 25,516
Total minimum lease payments | ​ | ​ | 38,266 |  | 38,622
Less: amounts representing interest | ​ |  | 5,691 |  | 9,092
Present value of net minimum lease payments | ​ | $ | 32,575 |  | 29,530
Less: current portion of lease obligations | ​ |  | 4,543 |  | 2,180
Non-current portion of lease obligations | ​ |  | 28,032 |  | 27,350
ROU assets | ​ | $ | 31,846 | ​ | 24,964
​ The table below is a reconciliation of future undiscounted cash flows to the operating and finance lease liabilities, and the related ROU assets, presented on our Consolidated Balance Sheet on September 30, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | Operating | ​ | Finance | ​
Years Ending September 30: |  | Leases |  | Leases |
2021 | ​ | $ | 5,614 | ​ | ​ | 2,930 | ​
2022 | ​ |  | 4,985 | ​ | ​ | 3,011 | ​
2023 | ​ |  | 3,984 | ​ | ​ | 3,094 | ​
2024 | ​ |  | 2,438 | ​ | ​ | 3,177 | ​
2025 and thereafter | ​ |  | 6,984 | ​ | ​ | 28,323 | ​
Total minimum lease payments | ​ | ​ | 24,005 | ​ | ​ | 40,535 | ​
Less: amounts representing interest | ​ |  | 2,211 | ​ | ​ | 10,270 | ​
Present value of net minimum lease payments | ​ | $ | 21,794 | ​ | ​ | 30,265 | ​
Less: current portion of lease obligations | ​ |  | 5,009 | ​ | ​ | 1,937 | ​
Non-current portion of lease obligations | ​ | ​ | 16,785 | ​ | ​ | 28,328 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
ROU assets | ​ | $ | 21,390 | ​ | ​ | 26,164 | ​

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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