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Retirement Plans (Tables) - Non-contributory defined benefit pension plan | 12 Months Ended
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Dec. 31, 2019
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) | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Change in benefit obligation: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Benefit obligation at beginning of year | ​ | $ | 28,906 | ​ | $ | 31,500 | ​ | $ | 28,800 | ​
Service cost | ​ | ​ | 121 | ​ | ​ | 77 | ​ | ​ | 127 | ​
Interest cost | ​ |  | 1,158 | ​ |  | 1,080 | ​ |  | 1,124 | ​
Actuarial (gain) loss | ​ |  | 2,471 | ​ |  | (2,442) | ​ |  | 2,665 | ​
Benefits paid | ​ |  | (538) | ​ |  | (1,188) | ​ |  | (1,138) | ​
Expenses | ​ | ​ | (318) | ​ | ​ | (121) | ​ | ​ | (78) | ​
Plan termination settlements | ​ | ​ | (31,800) | ​ | ​ | — | ​ | ​ | — | ​
Benefit obligation at end of year | ​ |  | — | ​ |  | 28,906 | ​ |  | 31,500 | ​
Change in plan assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ |  | 30,545 | ​ |  | 31,387 | ​ |  | 28,216 | ​
Actual return on plan assets | ​ |  | 2,111 | ​ |  | 467 | ​ |  | 4,387 | ​
Benefits paid | ​ |  | (538) | ​ |  | (1,188) | ​ |  | (1,138) | ​
Expenses | ​ | ​ | (318) | ​ | ​ | (121) | ​ | ​ | (78) | ​
Plan termination settlements | ​ | ​ | (31,800) | ​ | ​ | — | ​ | ​ | — | ​
Fair value of plan assets at end of year | ​ |  | — | ​ |  | 30,545 | ​ |  | 31,387 | ​
Funded (unfunded) status | ​ | $ | — | ​ | $ | 1,639 | ​ | $ | (113) | ​
Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31,
(Dollars in thousands) |  | ​ | 2019 | ​ | 2018 | ​ | 2017
Interest cost | ​ |  | $ | 1,157 |  | $ | 1,079 |  | $ | 1,124
Service cost | ​ | ​ | ​ | 121 | ​ | ​ | 78 | ​ | ​ | 127
Expected return on plan assets | ​ | ​ |  | (2,361) | ​ |  | (2,328) | ​ |  | (2,213)
Recognized net actuarial loss | ​ | ​ |  | 483 | ​ |  | 775 | ​ |  | 751
Net periodic pension benefit | ​ | ​ |  | (600) | ​ |  | (396) | ​ |  | (211)
Plan termination settlement | ​ | ​ | ​ | 10,126 | ​ | ​ | — | ​ | ​ | —
Net periodic pension cost with settlement | ​ | ​ | ​ | 9,526 | ​ | ​ | (396) | ​ | ​ | —
Net (gain) loss | ​ | ​ |  | 2,722 | ​ |  | (581) | ​ |  | 491
Amortization of net gain | ​ | ​ |  | (483) | ​ |  | (775) | ​ |  | (751)
Plan termination settlement adjustment | ​ | ​ | ​ | (10,126) | ​ | ​ | — | ​ | ​ | —
Total amount recognized in other comprehensive income | ​ | ​ |  | (7,887) | ​ |  | (1,356) | ​ |  | (260)
Total recognized in net periodic benefit cost and other comprehensive income | ​ | ​ | $ | 1,639 | ​ | $ | (1,752) | ​ | $ | (471)
Schedule of accumulated benefit obligations in excess of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2019 | ​ | 2018 |
Projected benefit obligation |  | $ | — |  | $ | 28,906 | ​
Accumulated benefit obligation | ​ |  | — | ​ |  | 28,906 | ​
Fair value of plan assets | ​ |  | — | ​ |  | 30,545 | ​
Schedule of weighted average assumptions used to determine benefit obligations and net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended |
​ | ​ | December 31, |
​ | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Discount rate |  | 4.10 | % | 3.50 | % | 4.00 | %
Expected long-term return on plan assets |  | 7.75 | % | 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) | ​ | 2019 | ​ | 2018 | ​ | 2017 |
Pension |  | $ | — |  | $ | (309) |  | $ | (351) | ​
Pension plan termination expense | ​ | ​ | 9,526 | ​ | ​ | — | ​ | ​ | — | ​
Employee savings plan/ 401(k) | ​ |  | 6,659 | ​ |  | 7,948 | ​ |  | 7,381 | ​
Supplemental executive retirement plan | ​ |  | 2,343 | ​ |  | 368 | ​ |  | 1,334 | ​
Post-retirement benefits | ​ |  | 144 | ​ |  | 254 | ​ |  | 251 | ​
​ | ​ | $ | 18,672 | ​ | $ | 8,261 | ​ | $ | 8,615 | ​

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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 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://fasb.org/us-gaap/role/ref/legacyRef -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 benefit obligation and plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + 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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