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Leases (Tables) | 3 Months Ended
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Mar. 31, 2021
Leases [Abstract] |
Summary of supplemental balance sheet information related to leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ | ​
(Dollars in thousands) | ​ | March 31, 2021 | ​ | December 31, 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease ROU asset | ​ | $ | 53,802 | ​ | $ | 50,743 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating lease liability | ​ | $ | 58,080 | ​ | $ | 59,100 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average remaining lease term-operating leases | ​ |  | 7.9 years | ​ |  | 8.3 years | ​
Weighted average discount rate-operating leases | ​ |  | 3.2 | % |  | 3.2 | %
Schedule of components of lease expense and cash flow information related to leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | At or for the three months ended | ​
(Dollars in thousands) | ​ | March 31, 2021 | ​ | March 31, 2020 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease Cost | ​ |  |  | ​ |  |  | ​
Operating lease cost | ​ | $ | 2,104 | ​ | $ | 1,885 | ​
Short-term lease cost | ​ |  | 35 | ​ |  | 34 | ​
Variable lease cost | ​ |  | 298 | ​ |  | 264 | ​
Total lease cost | ​ | $ | 2,437 | ​ | $ | 2,183 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other information | ​ |  |  | ​ |  |  | ​
Cash paid for amounts included in the measurement of lease liabilities | ​ |  |  | ​ |  |  | ​
Operating cash flows from operating leases | ​ | $ | 5,630 | ​ | $ | 1,982 | ​
Right-of-use assets obtained in exchange for new operating lease liabilities | ​ | $ | 4,760 | ​ | $ | 23 | ​
Schedule of Minimum annual rental payments for Bank facilities due under non-cancelable leases | The Company’s minimum annual rental payments for Bank facilities due under non-cancelable leases are as follows as of March 31, 2021: ​
​ | ​ | ​ | ​
​ | ​ | Minimum Rental
​ | ​ | (In thousands)
Years ended December 31: | ​ | ​ | ​
2021 | ​ | $ | 6,758
2022 | ​ | ​ | 9,145
2023 | ​ | ​ | 9,276
2024 | ​ | ​ | 9,119
2025 | ​ | ​ | 8,479
Thereafter | ​ | ​ | 22,898
Total minimum payments required | ​ | ​ | 65,675
Less: Implied interest | ​ | ​ | 7,595
Total lease obligations | ​ | $ | 58,080
​ The Company’s minimum annual rental payments for Bank facilities due under non-cancelable leases are as follows as of December 31, 2020: ​
​ | ​ | ​ | ​
​ | ​ | Minimum Rental
​ | ​ | (In thousands)
Years ended December 31: | ​ | ​ | ​
2021 | ​ | $ | 8,757
2022 | ​ | ​ | 8,871
2023 | ​ | ​ | 9,006
2024 | ​ | ​ | 8,847
2024 | ​ | ​ | 8,212
Thereafter | ​ | ​ | 23,547
Total minimum payments required | ​ | $ | 67,240
Less: Implied interest | ​ | ​ | 8,140
Total lease obligations | ​ | $ | 59,100
​ | ​ | ​ | ​

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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=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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