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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2022
Accumulated Other Comprehensive 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 March 31, 2022 | ​ | $ | (705,768) | ​ | $ | 188,266 | ​ | $ | (517,502)
Three months ended June 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (91,352) | ​ | ​ | 24,369 | ​ | ​ | (66,983)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 19,929 | ​ | ​ | (5,317) | ​ | ​ | 14,612
Net change in investment securities | ​ | ​ | (71,423) | ​ | ​ | 19,052 | ​ | ​ | (52,371)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (1,523) | ​ | ​ | 407 | ​ | ​ | (1,116)
Reclassification of net gains included in net income | ​ | ​ | (638) | ​ | ​ | 170 | ​ | ​ | (468)
Net change in cash flow derivative hedges | ​ | ​ | (2,161) | ​ | ​ | 577 | ​ | ​ | (1,584)
Other comprehensive loss | ​ | ​ | (73,584) | ​ | ​ | 19,629 | ​ | ​ | (53,955)
Accumulated other comprehensive loss at June 30, 2022 | ​ | $ | (779,352) | ​ | $ | 207,895 | ​ | $ | (571,457)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Six months ended June 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (629,437) | ​ | ​ | 167,903 | ​ | ​ | (461,534)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 19,929 | ​ | ​ | (5,317) | ​ | ​ | 14,612
Net change in investment securities | ​ | ​ | (609,508) | ​ | ​ | 162,586 | ​ | ​ | (446,922)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (3,239) | ​ | ​ | 865 | ​ | ​ | (2,374)
Reclassification of net gains included in net income | ​ | ​ | (638) | ​ | ​ | 170 | ​ | ​ | (468)
Net change in cash flow derivative hedges | ​ | ​ | (3,877) | ​ | ​ | 1,035 | ​ | ​ | (2,842)
Other comprehensive loss | ​ | ​ | (613,385) | ​ | ​ | 163,621 | ​ | ​ | (449,764)
Accumulated other comprehensive loss at June 30, 2022 | ​ | $ | (779,352) | ​ | $ | 207,895 | ​ | $ | (571,457)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at March 31, 2021 | ​ | $ | (59,238) | ​ | $ | 15,803 | ​ | $ | (43,435)
Three months ended June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 18,831 | ​ | ​ | (5,023) | ​ | ​ | 13,808
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (102) | ​ | ​ | 27 | ​ | ​ | (75)
Net change in investment securities | ​ | ​ | 18,729 | ​ | ​ | (4,996) | ​ | ​ | 13,733
Other comprehensive income | ​ | ​ | 18,729 | ​ | ​ | (4,996) | ​ | ​ | 13,733
Accumulated other comprehensive loss at June 30, 2021 | ​ | $ | (40,509) | ​ | $ | 10,807 | ​ | $ | (29,702)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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
Six months ended June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (83,505) | ​ | ​ | 22,274 | ​ | ​ | (61,231)
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (102) | ​ | ​ | 27 | ​ | ​ | (75)
Net change in investment securities | ​ | ​ | (83,607) | ​ | ​ | 22,301 | ​ | ​ | (61,306)
Other comprehensive loss | ​ | ​ | (83,607) | ​ | ​ | 22,301 | ​ | ​ | (61,306)
Accumulated other comprehensive loss at June 30, 2021 | ​ | $ | (40,509) | ​ | $ | 10,807 | ​ | $ | (29,702)
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 |  | Loss
Three Months Ended June 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (24,390) | ​ | $ | (491,854) | ​ | $ | — | ​ | $ | (1,258) | ​ | $ | (517,502)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity | ​ | ​ | — | ​ | ​ | 338,816 | ​ | ​ | (338,816) | ​ | ​ | — | ​ | ​ | —
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (66,983) | ​ | ​ | 14,612 | ​ | ​ | (1,584) | ​ | ​ | (53,955)
Balance at end of period | ​ | $ | (24,390) | ​ | $ | (220,021) | ​ | $ | (324,204) | ​ | $ | (2,842) | ​ | $ | (571,457)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 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 | ​ | ​ | — | ​ | ​ | 338,816 | ​ | ​ | (338,816) | ​ | ​ | — | ​ | ​ | —
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (461,534) | ​ | ​ | 14,612 | ​ | ​ | (2,842) | ​ | ​ | (449,764)
Balance at end of period | ​ | $ | (24,390) | ​ | $ | (220,021) | ​ | $ | (324,204) | ​ | $ | (2,842) | ​ | $ | (571,457)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,737) | ​ | $ | (11,698) | ​ | $ | — | ​ | $ | — | ​ | $ | (43,435)
Other comprehensive income | ​ | ​ | — | ​ | ​ | 13,733 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 13,733
Balance at end of period | ​ | $ | (31,737) | ​ | $ | 2,035 | ​ | $ | — | ​ | $ | — | ​ | $ | (29,702)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Six Months Ended June 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (31,737) | ​ | $ | 63,341 | ​ | $ | — | ​ | $ | — | ​ | $ | 31,604
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (61,306) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (61,306)
Balance at end of period | ​ | $ | (31,737) | ​ | $ | 2,035 | ​ | $ | — | ​ | $ | — | ​ | $ | (29,702)

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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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