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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) |
Schedule of changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2021 | ​ | $ | (165,967) | ​ | $ | 44,274 | ​ | $ | (121,693)
Year ended December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net actuarial gains arising during the year | ​ | ​ | 20,710 | ​ | ​ | (5,524) | ​ | ​ | 15,186
Amortization of net loss included in net income | ​ | ​ | 5,146 | ​ | ​ | (1,373) | ​ | ​ | 3,773
Net change in pension and other benefits | ​ | ​ | 25,856 | ​ | ​ | (6,897) | ​ | ​ | 18,959
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the year | ​ | ​ | (773,667) | ​ | ​ | 206,376 | ​ | ​ | (567,291)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 48,378 | ​ | ​ | (12,905) | ​ | ​ | 35,473
Net change in investment securities | ​ | ​ | (725,289) | ​ | ​ | 193,471 | ​ | ​ | (531,818)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the year | ​ | ​ | (6,710) | ​ | ​ | 1,790 | ​ | ​ | (4,920)
Reclassification of net losses included in net income | ​ | ​ | 297 | ​ | ​ | (79) | ​ | ​ | 218
Net change in cash flow derivative hedges | ​ | ​ | (6,413) | ​ | ​ | 1,711 | ​ | ​ | (4,702)
Other comprehensive loss | ​ | ​ | (705,846) | ​ | ​ | 188,285 | ​ | ​ | (517,561)
Accumulated other comprehensive loss at December 31, 2022 | ​ | $ | (871,813) | ​ | $ | 232,559 | ​ | $ | (639,254)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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
​
Summary of changes in accumulated other comprehensive income (loss), net of tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pensions | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | and | ​ | Available-for-Sale | ​ | Held-to-Maturity | ​ | Cash Flow | ​ | Other
​ | ​ | Other | ​ | Investment | ​ | Investment | ​ | Derivative | ​ | Comprehensive
(dollars in thousands) |  | Benefits |  | Securities |  | Securities |  | Hedges |  | Income (Loss)
Year Ended December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (24,390) | ​ | $ | (97,303) | ​ | $ | — | ​ | $ | — | ​ | $ | (121,693)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity | ​ | ​ | — | ​ | ​ | 372,419 | ​ | ​ | (372,419) | ​ | ​ | — | ​ | ​ | —
Other comprehensive income (loss) | ​ | ​ | 18,959 | ​ | ​ | (567,291) | ​ | ​ | 35,473 | ​ | ​ | (4,702) | ​ | ​ | (517,561)
Balance at end of year | ​ | $ | (5,431) | ​ | $ | (292,175) | ​ | $ | (336,946) | ​ | $ | (4,702) | ​ | $ | (639,254)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (31,737) | ​ | $ | 63,341 | ​ | $ | — | ​ | $ | — | ​ | $ | 31,604
Other comprehensive income (loss) | ​ | ​ | 7,347 | ​ | ​ | (160,644) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (153,297)
Balance at end of year | ​ | $ | (24,390) | ​ | $ | (97,303) | ​ | $ | — | ​ | $ | — | ​ | $ | (121,693)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (28,082) | ​ | $ | (3,667) | ​ | $ | — | ​ | $ | — | ​ | $ | (31,749)
Other comprehensive (loss) income | ​ | ​ | (3,655) | ​ | ​ | 67,008 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 63,353
Balance at end of year | ​ | $ | (31,737) | ​ | $ | 63,341 | ​ | $ | — | ​ | $ | — | ​ | $ | 31,604
​

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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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e526-108580 + Details
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