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Retirement Plans (Tables) - Non-contributory defined benefit pension plan | 12 Months Ended
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Dec. 31, 2020
Retirement Plans |
Schedule of the pension plan's funded status and amounts recognized in the company's accompanying consolidated financial statements | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Change in benefit obligation: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Benefit obligation at beginning of year | ​ | $ | — | ​ | $ | 28,906 | ​ | $ | 31,500 | ​
Service cost | ​ | ​ | — | ​ | ​ | 121 | ​ | ​ | 77 | ​
Interest cost | ​ |  | — | ​ |  | 1,158 | ​ |  | 1,080 | ​
Actuarial (gain) loss | ​ |  | — | ​ |  | 2,471 | ​ |  | (2,442) | ​
Benefits paid | ​ |  | — | ​ |  | (538) | ​ |  | (1,188) | ​
Expenses | ​ | ​ | — | ​ | ​ | (318) | ​ | ​ | (121) | ​
Plan termination settlements | ​ | ​ | — | ​ | ​ | (31,800) | ​ | ​ | — | ​
Benefit obligation at end of year | ​ |  | — | ​ |  | — | ​ |  | 28,906 | ​
Change in plan assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ |  | — | ​ |  | 30,545 | ​ |  | 31,387 | ​
Actual return on plan assets | ​ |  | — | ​ |  | 2,111 | ​ |  | 467 | ​
Benefits paid | ​ |  | — | ​ |  | (538) | ​ |  | (1,188) | ​
Expenses | ​ | ​ | — | ​ | ​ | (318) | ​ | ​ | (121) | ​
Plan termination settlements | ​ | ​ | — | ​ | ​ | (31,800) | ​ | ​ | — | ​
Fair value of plan assets at end of year | ​ |  | — | ​ |  | — | ​ |  | 30,545 | ​
Funded (unfunded) status | ​ | $ | — | ​ | $ | — | ​ | $ | 1,639 | ​
Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
(Dollars in thousands) | ​ | 2020 | ​ | 2019 | ​ | 2018
Interest cost |  | $ | — |  | $ | 1,157 |  | $ | 1,079
Service cost | ​ | ​ | — | ​ | ​ | 121 | ​ | ​ | 78
Expected return on plan assets | ​ |  | — | ​ |  | (2,361) | ​ |  | (2,328)
Recognized net actuarial loss | ​ |  | — | ​ |  | 483 | ​ |  | 775
Net periodic pension benefit | ​ |  | — | ​ |  | (600) | ​ |  | (396)
Plan termination settlement | ​ | ​ | — | ​ | ​ | 10,126 | ​ | ​ | —
Net periodic pension cost with settlement | ​ | ​ | — | ​ | ​ | 9,526 | ​ | ​ | —
Net (gain) loss | ​ |  | — | ​ |  | 2,722 | ​ |  | (581)
Amortization of net gain | ​ |  | — | ​ |  | (483) | ​ |  | (775)
Plan termination settlement adjustment | ​ | ​ | — | ​ | ​ | (10,126) | ​ | ​ | —
Total amount recognized in other comprehensive income | ​ |  | — | ​ |  | (7,887) | ​ |  | (1,356)
Total recognized in net periodic benefit cost and other comprehensive income | ​ | $ | — | ​ | $ | 1,639 | ​ | $ | (1,752)
Schedule of weighted average assumptions used to determine benefit obligations and net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended |
​ | ​ | December 31, |
​ | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Discount rate |  | — | % | 4.10 | % | 3.50 | %
Expected long-term return on plan assets |  | — | % | 7.75 | % | 7.75 | %
Schedule of expenses incurred and charged against operations with regard to all of the company's retirement plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, |
(Dollars in thousands) | ​ | 2020 | ​ | 2019 | ​ | 2018 |
Pension |  | $ | — |  | $ | — |  | $ | (309) | ​
Pension plan termination expense | ​ | ​ | — | ​ | ​ | 9,526 | ​ | ​ | — | ​
Employee savings plan/ 401(k) | ​ |  | 10,962 | ​ |  | 6,659 | ​ |  | 7,948 | ​
Supplemental executive retirement plan | ​ |  | 2,862 | ​ |  | 2,343 | ​ |  | 368 | ​
Post-retirement benefits | ​ |  | 43 | ​ |  | 144 | ​ |  | 254 | ​
​ | ​ | $ | 13,867 | ​ | $ | 18,672 | ​ | $ | 8,261 | ​

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- Definition Tabular disclosure of amount recognized in net periodic benefit cost and other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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