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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2023
AOCI Attributable to Parent [Abstract] |
Schedule of changes in accumulated other comprehensive loss | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2023 | ​ | $ | (835,647) | ​ | $ | 222,911 | ​ | $ | (612,736)
Three months ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (61,874) | ​ | ​ | 16,505 | ​ | ​ | (45,369)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 11,434 | ​ | ​ | (3,050) | ​ | ​ | 8,384
Net change in investment securities | ​ | ​ | (50,440) | ​ | ​ | 13,455 | ​ | ​ | (36,985)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (373) | ​ | ​ | 100 | ​ | ​ | (273)
Reclassification of net losses included in net income | ​ | ​ | 1,723 | ​ | ​ | (460) | ​ | ​ | 1,263
Net change in cash flow derivative hedges | ​ | ​ | 1,350 | ​ | ​ | (360) | ​ | ​ | 990
Other comprehensive loss | ​ | ​ | (49,090) | ​ | ​ | 13,095 | ​ | ​ | (35,995)
Accumulated other comprehensive loss at September 30, 2023 | ​ | $ | (884,737) | ​ | $ | 236,006 | ​ | $ | (648,731)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at December 31, 2022 | ​ | $ | (871,813) | ​ | $ | 232,559 | ​ | $ | (639,254)
Nine months ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (50,861) | ​ | ​ | 13,567 | ​ | ​ | (37,294)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 36,206 | ​ | ​ | (9,658) | ​ | ​ | 26,548
Net change in investment securities | ​ | ​ | (14,655) | ​ | ​ | 3,909 | ​ | ​ | (10,746)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (2,868) | ​ | ​ | 765 | ​ | ​ | (2,103)
Reclassification of net losses included in net income | ​ | ​ | 4,599 | ​ | ​ | (1,227) | ​ | ​ | 3,372
Net change in cash flow derivative hedges | ​ | ​ | 1,731 | ​ | ​ | (462) | ​ | ​ | 1,269
Other comprehensive loss | ​ | ​ | (12,924) | ​ | ​ | 3,447 | ​ | ​ | (9,477)
Accumulated other comprehensive loss at September 30, 2023 | ​ | $ | (884,737) | ​ | $ | 236,006 | ​ | $ | (648,731)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2022 | ​ | $ | (779,352) | ​ | $ | 207,895 | ​ | $ | (571,457)
Three months ended September 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (130,000) | ​ | ​ | 34,677 | ​ | ​ | (95,323)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 15,217 | ​ | ​ | (4,058) | ​ | ​ | 11,159
Net change in investment securities | ​ | ​ | (114,783) | ​ | ​ | 30,619 | ​ | ​ | (84,164)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (4,372) | ​ | ​ | 1,165 | ​ | ​ | (3,207)
Reclassification of net losses included in net income | ​ | ​ | 98 | ​ | ​ | (26) | ​ | ​ | 72
Net change in cash flow derivative hedges | ​ | ​ | (4,274) | ​ | ​ | 1,139 | ​ | ​ | (3,135)
Other comprehensive loss | ​ | ​ | (119,057) | ​ | ​ | 31,758 | ​ | ​ | (87,299)
Accumulated other comprehensive loss at September 30, 2022 | ​ | $ | (898,409) | ​ | $ | 239,653 | ​ | $ | (658,756)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Nine months ended September 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (759,437) | ​ | ​ | 202,580 | ​ | ​ | (556,857)
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortization of unrealized holding losses on held-to-maturity securities | ​ | ​ | 35,146 | ​ | ​ | (9,375) | ​ | ​ | 25,771
Net change in investment securities | ​ | ​ | (724,291) | ​ | ​ | 193,205 | ​ | ​ | (531,086)
Cash flow derivative hedges: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (7,611) | ​ | ​ | 2,030 | ​ | ​ | (5,581)
Reclassification of net gains included in net income | ​ | ​ | (540) | ​ | ​ | 144 | ​ | ​ | (396)
Net change in cash flow derivative hedges | ​ | ​ | (8,151) | ​ | ​ | 2,174 | ​ | ​ | (5,977)
Other comprehensive loss | ​ | ​ | (732,442) | ​ | ​ | 195,379 | ​ | ​ | (537,063)
Accumulated other comprehensive loss at September 30, 2022 | ​ | $ | (898,409) | ​ | $ | 239,653 | ​ | $ | (658,756)
Summary of changes in accumulated other comprehensive 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 September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,431) | ​ | $ | (284,100) | ​ | $ | (318,782) | ​ | $ | (4,423) | ​ | $ | (612,736)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (45,369) | ​ | ​ | 8,384 | ​ | ​ | 990 | ​ | ​ | (35,995)
Balance at end of period | ​ | $ | (5,431) | ​ | $ | (329,469) | ​ | $ | (310,398) | ​ | $ | (3,433) | ​ | $ | (648,731)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2023 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (5,431) | ​ | $ | (292,175) | ​ | $ | (336,946) | ​ | $ | (4,702) | ​ | $ | (639,254)
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (37,294) | ​ | ​ | 26,548 | ​ | ​ | 1,269 | ​ | ​ | (9,477)
Balance at end of period | ​ | $ | (5,431) | ​ | $ | (329,469) | ​ | $ | (310,398) | ​ | $ | (3,433) | ​ | $ | (648,731)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (24,390) | ​ | $ | (220,021) | ​ | $ | (324,204) | ​ | $ | (2,842) | ​ | $ | (571,457)
Unrealized net losses related to the transfer of securities from available-for-sale to held-to-maturity | ​ | ​ | — | ​ | ​ | 33,603 | ​ | ​ | (33,603) | ​ | ​ | — | ​ | ​ | —
Other comprehensive (loss) income | ​ | ​ | — | ​ | ​ | (95,323) | ​ | ​ | 11,159 | ​ | ​ | (3,135) | ​ | ​ | (87,299)
Balance at end of period | ​ | $ | (24,390) | ​ | $ | (281,741) | ​ | $ | (346,648) | ​ | $ | (5,977) | ​ | $ | (658,756)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (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 (loss) income | ​ | ​ | — | ​ | ​ | (556,857) | ​ | ​ | 25,771 | ​ | ​ | (5,977) | ​ | ​ | (537,063)
Balance at end of period | ​ | $ | (24,390) | ​ | $ | (281,741) | ​ | $ | (346,648) | ​ | $ | (5,977) | ​ | $ | (658,756)
​

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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 -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1 + Details
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