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Accumulated Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss). |
Accumulated Other Comprehensive Income (Loss) | 9. Accumulated Other Comprehensive Income (Loss) ​ Accumulated other comprehensive income (loss) is defined as the revenues, expenses, gains and losses that are included in comprehensive income but excluded from net income. The Company’s significant items of accumulated other comprehensive income (loss) are pension and other benefits and net unrealized gains or losses on investment securities. ​ Changes in accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2021 and 2020 are presented below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Income | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Tax | ​ | ​ | ​
​ | ​ | Pre-tax | ​ | Benefit | ​ | Net of
(dollars in thousands) |  | Amount |  | (Expense) |  | Tax
Accumulated other comprehensive income at June 30, 2020 | ​ | $ | 71,911 | ​ | $ | (19,180) | ​ | $ | 52,731
Three months ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net losses arising during the period | ​ | ​ | (1,991) | ​ | ​ | 532 | ​ | ​ | (1,459)
Reclassification of net gains to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities gains, net | ​ | ​ | (24) | ​ | ​ | 6 | ​ | ​ | (18)
Net change in investment securities | ​ | ​ | (2,015) | ​ | ​ | 538 | ​ | ​ | (1,477)
Other comprehensive loss | ​ | ​ | (2,015) | ​ | ​ | 538 | ​ | ​ | (1,477)
Accumulated other comprehensive income at September 30, 2020 | ​ | $ | 69,896 | ​ | $ | (18,642) | ​ | $ | 51,254
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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)
Nine months ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Pension and other benefits: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Change in Company tax rate | ​ | ​ | — | ​ | ​ | (96) | ​ | ​ | (96)
Net change in pension and other benefits | ​ | ​ | — | ​ | ​ | (96) | ​ | ​ | (96)
Investment securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized net gains arising during the period | ​ | ​ | 113,244 | ​ | ​ | (30,220) | ​ | ​ | 83,024
Reclassification of net losses to net income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment securities losses, net | ​ | ​ | 102 | ​ | ​ | (27) | ​ | ​ | 75
Net change in investment securities | ​ | ​ | 113,346 | ​ | ​ | (30,247) | ​ | ​ | 83,099
Other comprehensive income | ​ | ​ | 113,346 | ​ | ​ | (30,343) | ​ | ​ | 83,003
Accumulated other comprehensive income at September 30, 2020 | ​ | $ | 69,896 | ​ | $ | (18,642) | ​ | $ | 51,254
​ The following table summarizes changes in accumulated other comprehensive income (loss), net of tax, for the periods indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pensions | ​ | ​ | ​ | Accumulated
​ | ​ | and | ​ | ​ | ​ | Other
​ | ​ | Other | ​ | Investment | ​ | Comprehensive
(dollars in thousands) |  | Benefits |  | Securities |  | Income (Loss)
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 period | ​ | $ | (31,737) | ​ | $ | 63,341 | ​ | $ | 31,604
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (93,067) | ​ | ​ | (93,067)
Balance at end of period | ​ | $ | (31,737) | ​ | $ | (29,726) | ​ | $ | (61,463)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Three Months Ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,178) | ​ | $ | 80,909 | ​ | $ | 52,731
Other comprehensive loss | ​ | ​ | — | ​ | ​ | (1,477) | ​ | ​ | (1,477)
Balance at end of period | ​ | $ | (28,178) | ​ | $ | 79,432 | ​ | $ | 51,254
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Nine Months Ended September 30, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | (28,082) | ​ | $ | (3,667) | ​ | $ | (31,749)
Other comprehensive income | ​ | ​ | (96) | ​ | ​ | 83,099 | ​ | ​ | 83,003
Balance at end of period | ​ | $ | (28,178) | ​ | $ | 79,432 | ​ | $ | 51,254
​

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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