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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental Retirement Plan |
Benefit plans |
Schedule of change in projected benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |
​ | ​ | (Dollars in thousands) |
Change in projected benefit obligation: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Projected benefit obligation at beginning of year | ​ | $ | 33,689 | ​ | $ | 26,781 | ​
Projected benefit obligation of SERP agreements acquired from Presidio | ​ | ​ | — | ​ | ​ | 2,541 | ​
Service cost | ​ |  | 492 | ​ |  | 263 | ​
Actuarial loss (gain) | ​ |  | 3,008 | ​ |  | 4,182 | ​
Interest cost | ​ |  | 935 | ​ |  | 1,059 | ​
Benefits paid | ​ |  | (3,118) | ​ |  | (1,137) | ​
Plan amendment | ​ | ​ | 398 | ​ | ​ | — | ​
Projected benefit obligation at end of year | ​ | $ | 35,404 | ​ | $ | 33,689 | ​
Amounts recognized in accumulated other comprehensive loss: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial loss | ​ | $ | 12,445 | ​ | $ | 9,714 | ​
Schedule of weighted-average assumptions used to determine the benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |
Discount rate |  | 2.26 | % | 3.01 | %
Rate of compensation increase |  | N/A | ​ | N/A | ​
Schedule of estimated benefit payments over the next ten years, which reflect anticipated future events, service and other assumptions | ​
​ | ​ | ​ | ​ | ​
​ |  | Estimated |
​ | ​ | Benefit |
Year | ​ | Payments |
​ | ​ | (Dollars in thousands) |
2021 | ​ | $ | 2,123 | ​
2022 | ​ |  | 1,814 | ​
2023 | ​ |  | 1,918 | ​
2024 | ​ |  | 1,954 | ​
2025 | ​ |  | 2,026 | ​
2026 to 2030 | ​ | ​ | 11,465 | ​
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 | ​
​ | ​ | (Dollars in thousands) | ​
Components of net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 492 | ​ | $ | 263 | ​
Interest cost | ​ |  | 935 | ​ |  | 1,059 | ​
Amortization of prior transition obligation | ​ | ​ | 299 | ​ | ​ | — | ​
Amortization of net actuarial loss | ​ |  | 387 | ​ |  | 184 | ​
Accelerated benefits for Presidio SERP agreements | ​ | ​ | ​ | ​ | ​ | ​ | ​
due to change in control | ​ | ​ | — | ​ | ​ | 1,465 | ​
Net periodic benefit cost | ​ | $ | 2,113 | ​ | $ | 2,971 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amount recognized in other comprehensive income | ​ | $ | 1,924 | ​ | $ | 2,847 | ​
Schedule of assumption used to determine the net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |
Discount rate |  | 3.01 | % | 4.03 | %
Rate of compensation increase |  | N/A | ​ | N/A | ​
Split-Dollar Life Insurance Benefit Plan |
Benefit plans |
Schedule of change in projected benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31, |
​ | ​ | 2020 |  | 2019 | ​
​ | ​ | (Dollars in thousands) |
Change in projected benefit obligation: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Projected benefit obligation at beginning of year | ​ | $ | 8,198 | ​ | $ | 6,903 | ​
Interest cost | ​ |  | 246 | ​ |  | 278 | ​
Actuarial loss (gain) | ​ |  | 1,245 | ​ |  | 1,017 | ​
Projected benefit obligation at end of period | ​ | $ | 9,689 | ​ | $ | 8,198 | ​
Schedule of weighted-average assumptions used to determine the benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |
Discount rate |  | 2.26 | % | 3.01 | %
Schedule of amounts recognized in accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31, |
​ | ​ | 2020 |  | 2019 | ​
​ | ​ | (Dollars in thousands) |
Net actuarial loss | ​ | $ | 5,170 | ​ | $ | 3,776 | ​
Prior transition obligation | ​ |  | 970 | ​ |  | 1,059 | ​
Accumulated other comprehensive loss | ​ | $ | 6,140 | ​ | $ | 4,835 | ​
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 | ​
​ | ​ | (Dollars in thousands) |
Amortization of prior transition obligation and actuarial losses | ​ | $ | (60) | ​ | $ | (96) | ​
Interest cost | ​ |  | 246 | ​ |  | 278 | ​
Net periodic benefit cost | ​ | $ | 186 | ​ | $ | 182 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amount recognized in other comprehensive income | ​ | $ | 1,305 | ​ | $ | 1,113 | ​
Schedule of assumption used to determine the net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |
Discount rate |  | 3.01 | % | 4.03 | %

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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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