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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 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 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive loss at June 30, 2021 | ​ | $ | (40,509) | ​ | $ | 10,807 | ​ | $ | (29,702)
Three months ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (43,316) | ​ | ​ | 11,555 | ​ | ​ | (31,761)
Net change in investment securities | ​ | ​ | (43,316) | ​ | ​ | 11,555 | ​ | ​ | (31,761)
Other comprehensive loss | ​ | ​ | (43,316) | ​ | ​ | 11,555 | ​ | ​ | (31,761)
Accumulated other comprehensive loss at September 30, 2021 | ​ | $ | (83,825) | ​ | $ | 22,362 | ​ | $ | (61,463)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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
Nine months ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (126,821) | ​ | ​ | 33,829 | ​ | ​ | (92,992)
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (102) | ​ | ​ | 27 | ​ | ​ | (75)
Net change in investment securities | ​ | ​ | (126,923) | ​ | ​ | 33,856 | ​ | ​ | (93,067)
Other comprehensive loss | ​ | ​ | (126,923) | ​ | ​ | 33,856 | ​ | ​ | (93,067)
Accumulated other comprehensive loss at September 30, 2021 | ​ | $ | (83,825) | ​ | $ | 22,362 | ​ | $ | (61,463)
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 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 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 (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)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (31,737) | ​ | $ | 2,035 | ​ | $ | — | ​ | $ | — | ​ | $ | (29,702)
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (31,761) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (31,761)
Balance at end of period | ​ | $ | (31,737) | ​ | $ | (29,726) | ​ | $ | — | ​ | $ | — | ​ | $ | (61,463)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of year | ​ | $ | (31,737) | ​ | $ | 63,341 | ​ | $ | — | ​ | $ | — | ​ | $ | 31,604
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (93,067) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (93,067)
Balance at end of period | ​ | $ | (31,737) | ​ | $ | (29,726) | ​ | $ | — | ​ | $ | — | ​ | $ | (61,463)

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