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Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Benefit Plans |
Schedule of amounts recognized in other comprehensive income from benefit plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Other Benefits | ​
(dollars in thousands) |  | 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |
Amounts arising during the year: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss (gain) on pension assets | ​ | $ | 3,581 | ​ | $ | (4,839) | ​ | $ | (16,278) | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​
Net (gain) loss on pension obligations | ​ | ​ | (4,614) | ​ | ​ | 14,935 | ​ | ​ | 21,512 | ​ | ​ | (2,074) | ​ | ​ | 303 | ​ | ​ | 540 | ​
Reclassification adjustments recognized as components of net periodic benefit cost during the year: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net (gain) loss | ​ | ​ | (6,961) | ​ | ​ | (5,806) | ​ | ​ | (6,995) | ​ | ​ | 48 | ​ | ​ | 211 | ​ | ​ | 385 | ​
Prior service credit | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 51 | ​ | ​ | 429 | ​
Amount recognized in other comprehensive income | ​ | $ | (7,994) | ​ | $ | 4,290 | ​ | $ | (1,761) | ​ | $ | (2,026) | ​ | $ | 565 | ​ | $ | 1,354 | ​
Schedule of amounts within accumulated other comprehensive income not yet recognized in net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Other Benefits
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Net actuarial loss (gain) | ​ | $ | 36,357 | ​ | $ | 44,351 | ​ | $ | (3,094) | ​ | $ | (1,068)
Prior service credit | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total, pretax effect | ​ | ​ | 36,357 | ​ | ​ | 44,351 | ​ | ​ | (3,094) | ​ | ​ | (1,068)
Tax impact | ​ | ​ | (9,698) | ​ | ​ | (11,831) | ​ | ​ | 825 | ​ | ​ | 285
Ending balance in accumulated other comprehensive loss | ​ | $ | 26,659 | ​ | $ | 32,520 | ​ | $ | (2,269) | ​ | $ | (783)
Summary of changes to projected or accumulated benefit obligation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Other Benefits
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Benefit obligation at beginning of year | ​ | $ | 219,392 | ​ | $ | 213,285 | ​ | $ | 22,538 | ​ | $ | 21,305
Service cost | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 874 | ​ | ​ | 768
Interest cost | ​ | ​ | 5,065 | ​ | ​ | 6,519 | ​ | ​ | 515 | ​ | ​ | 640
Actuarial (gain) loss | ​ | ​ | (4,614) | ​ | ​ | 14,935 | ​ | ​ | (2,074) | ​ | ​ | 303
Benefit payments | ​ | ​ | (15,411) | ​ | ​ | (15,347) | ​ | ​ | (491) | ​ | ​ | (478)
Benefit obligation at end of year | ​ | $ | 204,432 | ​ | $ | 219,392 | ​ | $ | 21,362 | ​ | $ | 22,538
Summary of changes to fair value of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Other Benefits
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Fair value of plan assets at beginning of year | ​ | $ | 114,795 | ​ | $ | 112,659 | ​ | $ | — | ​ | $ | —
Actual return on plan assets | ​ | ​ | (536) | ​ | ​ | 9,637 | ​ | ​ | — | ​ | ​ | —
Benefit payments from trust | ​ | ​ | (7,611) | ​ | ​ | (7,501) | ​ | ​ | — | ​ | ​ | —
Fair value of plan assets at end of year | ​ | $ | 106,648 | ​ | $ | 114,795 | ​ | $ | — | ​ | $ | —
Summary of funded status of plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Other Benefits
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Pension assets for overfunded plans | ​ | $ | 15,345 | ​ | $ | 16,237 | ​ | $ | — | ​ | $ | —
Pension liabilities for underfunded plans | ​ | ​ | (113,129) | ​ | ​ | (120,834) | ​ | ​ | (21,362) | ​ | ​ | (22,538)
Funded status | ​ | $ | (97,784) | ​ | $ | (104,597) | ​ | $ | (21,362) | ​ | $ | (22,538)
Schedule of projected and accumulated benefit obligation and fair value of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Funded Pension Plan | ​ | Unfunded Pension Plans | ​ | Total Pension Plans
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Projected benefit obligation | ​ | $ | 91,303 | ​ | $ | 98,558 | ​ | $ | 113,129 | ​ | $ | 120,834 | ​ | $ | 204,432 | ​ | $ | 219,392
Accumulated benefit obligation | ​ | ​ | 91,303 | ​ | ​ | 98,558 | ​ | ​ | 113,129 | ​ | ​ | 120,766 | ​ | ​ | 204,432 | ​ | ​ | 219,324
Fair value of plan assets | ​ | ​ | 106,648 | ​ | ​ | 114,795 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 106,648 | ​ | ​ | 114,795
Overfunded (underfunded) portion of PBO/ABO | ​ | ​ | 15,345 | ​ | ​ | 16,237 | ​ | ​ | (113,129) | ​ | ​ | (120,834) | ​ | ​ | (97,784) | ​ | ​ | (104,597)
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Income line item where recognized in | ​ | Pension Benefits | ​ | Other Benefits | ​
(dollars in thousands) | ​ | the consolidated statements of income |  | 2021 |  | 2020 |  | 2019 |  | 2021 |  | 2020 |  | 2019 |
Service cost | ​ | Salaries and employee benefits | ​ | $ | — | ​ | $ | — | ​ | $ | 14 | ​ | $ | 874 | ​ | $ | 768 | ​ | $ | 710 | ​
Interest cost | ​ | Other noninterest expense | ​ | ​ | 5,065 | ​ | ​ | 6,519 | ​ | ​ | 8,261 | ​ | ​ | 515 | ​ | ​ | 640 | ​ | ​ | 808 | ​
Expected return on plan assets | ​ | Other noninterest expense | ​ | ​ | (3,044) | ​ | ​ | (4,800) | ​ | ​ | (4,585) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​
Prior service credit | ​ | Other noninterest expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (51) | ​ | ​ | (429) | ​
Recognized net actuarial loss (gain) | ​ | Other noninterest expense | ​ | ​ | 6,961 | ​ | ​ | 5,806 | ​ | ​ | 6,995 | ​ | ​ | (48) | ​ | ​ | (211) | ​ | ​ | (385) | ​
Total net periodic benefit cost | ​ | ​ | ​ | $ | 8,982 | ​ | $ | 7,525 | ​ | $ | 10,685 | ​ | $ | 1,341 | ​ | $ | 1,146 | ​ | $ | 704 | ​
Schedule of funded pension benefit amounts included in pension benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Funded Pension Benefits
(dollars in thousands) |  | 2021 |  | 2020 |  | 2019
Interest cost | ​ | $ | 2,261 | ​ | $ | 2,946 | ​ | $ | 3,808
Expected return on plan assets | ​ | ​ | (3,044) | ​ | ​ | (4,800) | ​ | ​ | (4,585)
Recognized net actuarial loss | ​ | ​ | 1,609 | ​ | ​ | 1,421 | ​ | ​ | 3,714
Total net periodic benefit cost | ​ | $ | 826 | ​ | $ | (433) | ​ | $ | 2,937
Schedule of assumptions used to determine benefit obligations and net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | FHI ERP Pension Benefits | ​ | SERP Pension Benefits | ​ | Other Benefits | ​
​ |  | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020 | ​
Discount rate | ​ | 2.77 | % | 2.37 | % | 2.77 | % | 2.37 | % | 2.77 | % | 2.37 | %
Rate of compensation increase | ​ | NA | ​ | NA | ​ | NA | ​ | NA | ​ | NA | ​ | NA | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | FHI ERP Pension Benefits | ​ | SERP Pension Benefits | ​ | Other Benefits | ​
​ |  | 2021 | ​ | 2020 | ​ | 2019 | ​ | 2021 | ​ | 2020 | ​ | 2019 | ​ | 2021 | ​ | 2020 | ​ | 2019 | ​
Discount rate | ​ | 2.37 | % | 3.16 | % | 4.30 | % | 2.37 | % | 3.16 | % | 4.30 | % | 2.37 | % | 3.16 | % | 4.30 | %
Expected long-term return on plan assets | ​ | 2.75 | % | 4.40 | % | 4.75 | % | NA | ​ | NA | ​ | NA | ​ | NA | ​ | NA | ​ | NA | ​
Rate of compensation increase | ​ | NA | ​ | NA | ​ | NA | ​ | NA | ​ | NA | ​ | 4.00 | % | NA | ​ | NA | ​ | NA | ​
Schedule of assumed healthcare cost trend rates | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 | ​ | 2020 | ​ | 2019 | ​
Healthcare cost trend rate assumed for next year | ​ | 6.00 | % | 6.25 | % | 6.50 | %
Rate to which the cost trend is assumed to decline (the ultimate trend rate) | ​ | 5.00 | % | 5.00 | % | 5.00 | %
Year that the rate reaches the ultimate trend rate | ​ | 2026 | ​ | 2026 | ​ | 2026 | ​
Schedule of allocation of employee retirement plan assets | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Asset Allocation | ​
​ |  | 2021 |  | 2020 | ​
Equity securities | ​ | 11 | % | 13 | %
Debt securities | ​ | 85 | % | 85 | %
Other securities | ​ | 4 | % | 2 | %
Total | ​ | 100 | % | 100 | %
Schedule of target allocation of employee retirement plan assets | ​
​ | ​ | ​ | ​
​ | ​ | Target
​ |  | Allocation
Equity securities | ​ | 10 | %
Debt securities | ​ | 88 | %
Other securities | ​ | 2 | %
Schedule of expected future benefit payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension | ​ | Other
(dollars in thousands) |  | Benefits |  | Benefits
2022 | ​ | $ | 15,787 | ​ | $ | 1,204
2023 | ​ | ​ | 15,466 | ​ | ​ | 1,321
2024 | ​ | ​ | 15,053 | ​ | ​ | 1,412
2025 | ​ | ​ | 15,191 | ​ | ​ | 1,455
2026 | ​ | ​ | 15,268 | ​ | ​ | 1,494
2027 to 2031 | ​ | ​ | 65,836 | ​ | ​ | 7,905
Schedule of fair value of employee retirement plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | Quoted Prices | ​ | Significant | ​ | ​ | ​ | ​
​ | ​ | In Active | ​ | Other | ​ | Significant | ​ | ​
​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​
(dollars in thousands) |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Asset classes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 4,451 | ​ | $ | — | ​ | $ | — | ​ | $ | 4,451
Fixed income - U.S. Treasury securities | ​ | ​ | — | ​ | ​ | 8,343 | ​ | ​ | — | ​ | ​ | 8,343
Fixed income - U.S. government agency securities | ​ | ​ | — | ​ | ​ | 9,674 | ​ | ​ | — | ​ | ​ | 9,674
Fixed income - U.S. corporate securities | ​ | ​ | — | ​ | ​ | 69,926 | ​ | ​ | — | ​ | ​ | 69,926
Fixed income - municipal securities | ​ | ​ | — | ​ | ​ | 495 | ​ | ​ | — | ​ | ​ | 495
Fixed income - international securities | ​ | ​ | 1,779 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,779
Equity - large-cap exchange-traded funds | ​ | ​ | 7,840 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,840
Equity - mid-cap exchange-traded funds | ​ | ​ | 1,360 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,360
Equity - small-cap exchange-traded funds | ​ | ​ | 654 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 654
Equity - international funds | ​ | ​ | 2,126 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,126
Total | ​ | $ | 18,210 | ​ | $ | 88,438 | ​ | $ | — | ​ | $ | 106,648
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ | ​ | Quoted Prices | ​ | Significant | ​ | ​ | ​ | ​
​ | ​ | In Active | ​ | Other | ​ | Significant | ​ | ​
​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​
(dollars in thousands) |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total
Asset classes: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash and cash equivalents | ​ | $ | 2,576 | ​ | $ | — | ​ | $ | — | ​ | $ | 2,576
Fixed income - U.S. Treasury securities | ​ | ​ | — | ​ | ​ | 6,776 | ​ | ​ | — | ​ | ​ | 6,776
Fixed income - U.S. government agency securities | ​ | ​ | — | ​ | ​ | 12,441 | ​ | ​ | — | ​ | ​ | 12,441
Fixed income - U.S. corporate securities | ​ | ​ | — | ​ | ​ | 70,401 | ​ | ​ | — | ​ | ​ | 70,401
Fixed income - municipal securities | ​ | ​ | — | ​ | ​ | 521 | ​ | ​ | — | ​ | ​ | 521
Fixed income - mutual funds | ​ | ​ | 5,626 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,626
Fixed income - international securities | ​ | ​ | 1,980 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,980
Equity - large-cap exchange-traded funds | ​ | ​ | 9,321 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 9,321
Equity - mid-cap exchange-traded funds | ​ | ​ | 1,566 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,566
Equity - small-cap exchange-traded funds | ​ | ​ | 785 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 785
Equity - international funds | ​ | ​ | 2,802 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,802
Total | ​ | $ | 24,656 | ​ | $ | 90,139 | ​ | $ | — | ​ | $ | 114,795
Summary of change in net actuarial loss and amortization | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive income at December 31, 2020 | ​ | $ | 43,098 | ​ | $ | (11,494) | ​ | $ | 31,604
Year ended December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial gains arising during the year | ​ | ​ | 3,107 | ​ | ​ | (829) | ​ | ​ | 2,278
Amortization of net loss included in net income | ​ | ​ | 6,913 | ​ | ​ | (1,844) | ​ | ​ | 5,069
Net change in pension and other benefits | ​ | ​ | 10,020 | ​ | ​ | (2,673) | ​ | ​ | 7,347
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the year | ​ | ​ | (218,983) | ​ | ​ | 58,414 | ​ | ​ | (160,569)
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (102) | ​ | ​ | 27 | ​ | ​ | (75)
Net change in investment securities | ​ | ​ | (219,085) | ​ | ​ | 58,441 | ​ | ​ | (160,644)
Other comprehensive loss | ​ | ​ | (209,065) | ​ | ​ | 55,768 | ​ | ​ | (153,297)
Accumulated other comprehensive loss at December 31, 2021 | ​ | $ | (165,967) | ​ | $ | 44,274 | ​ | $ | (121,693)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2019 | ​ | $ | (43,450) | ​ | $ | 11,701 | ​ | $ | (31,749)
Year ended December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial losses arising during the year | ​ | ​ | (10,399) | ​ | ​ | 2,774 | ​ | ​ | (7,625)
Prior service credit | ​ | ​ | (51) | ​ | ​ | 14 | ​ | ​ | (37)
Amortization of net loss included in net income | ​ | ​ | 5,595 | ​ | ​ | (1,492) | ​ | ​ | 4,103
Change in Company tax rate | ​ | ​ | — | ​ | ​ | (96) | ​ | ​ | (96)
Net change in pension and other benefits | ​ | ​ | (4,855) | ​ | ​ | 1,200 | ​ | ​ | (3,655)
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the year | ​ | ​ | 91,289 | ​ | ​ | (24,365) | ​ | ​ | 66,924
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 114 | ​ | ​ | (30) | ​ | ​ | 84
Net change in investment securities | ​ | ​ | 91,403 | ​ | ​ | (24,395) | ​ | ​ | 67,008
Other comprehensive income | ​ | ​ | 86,548 | ​ | ​ | (23,195) | ​ | ​ | 63,353
Accumulated other comprehensive income at December 31, 2020 | ​ | $ | 43,098 | ​ | $ | (11,494) | ​ | $ | 31,604
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2018 | ​ | $ | (180,915) | ​ | $ | 48,720 | ​ | $ | (132,195)
Year ended December 31, 2019 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial losses arising during the year | ​ | ​ | (5,774) | ​ | ​ | 1,555 | ​ | ​ | (4,219)
Prior service credit | ​ | ​ | (429) | ​ | ​ | 115 | ​ | ​ | (314)
Amortization of net loss included in net income | ​ | ​ | 6,610 | ​ | ​ | (1,780) | ​ | ​ | 4,830
Net change in pension and other benefits | ​ | ​ | 407 | ​ | ​ | (110) | ​ | ​ | 297
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the year | ​ | ​ | 134,343 | ​ | ​ | (36,178) | ​ | ​ | 98,165
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 2,715 | ​ | ​ | (731) | ​ | ​ | 1,984
Net change in investment securities | ​ | ​ | 137,058 | ​ | ​ | (36,909) | ​ | ​ | 100,149
Other comprehensive income | ​ | ​ | 137,465 | ​ | ​ | (37,019) | ​ | ​ | 100,446
Accumulated other comprehensive loss at December 31, 2019 | ​ | $ | (43,450) | ​ | $ | 11,701 | ​ | $ | (31,749)
Pension and other benefits, net actuarial losses arising during the period |
Benefit Plans |
Summary of change in net actuarial loss and amortization | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Other Benefits
(dollars in thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Net actuarial loss (gain) at beginning of year | ​ | $ | 44,351 | ​ | $ | 40,061 | ​ | $ | (1,068) | ​ | $ | (1,582)
Amortization cost | ​ | ​ | (6,961) | ​ | ​ | (5,806) | ​ | ​ | 48 | ​ | ​ | 211
Liability loss | ​ | ​ | (4,614) | ​ | ​ | 14,935 | ​ | ​ | (2,074) | ​ | ​ | 303
Asset loss (gain) | ​ | ​ | 3,581 | ​ | ​ | (4,839) | ​ | ​ | — | ​ | ​ | —
Net actuarial loss (gain) at end of year | ​ | $ | 36,357 | ​ | $ | 44,351 | ​ | $ | (3,094) | ​ | $ | (1,068)

X
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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=123447040&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=123450688&loc=d3e4179-114921 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI http://asc.fasb.org/extlink&oid=123447040&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=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e526-108580 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + 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 (l) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + 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 (c) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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