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Comprehensive Income/Loss (Tables) | 9 Months Ended
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Sep. 30, 2022
Equity [Abstract] |
Comprehensive income | The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the periods indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
| Three Months Ended September 30, 2022 |  | Nine Months Ended September 30, 2022
| Pre-Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | (55,461) |  |  | $ | 12,879 |  |  | $ | (42,582) |  |  | $ | (167,814) |  |  | $ | 38,942 |  |  | $ | (128,872) |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (55,461) |  |  | 12,879 |  |  | (42,582) |  |  | (167,814) |  |  | 38,942 |  |  | (128,872) |
Change in fair value of cash flow hedges | (37,357) |  |  | 10,505 |  |  | (26,852) |  |  | (64,963) |  |  | 18,277 |  |  | (46,686) |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 407 |  |  | (115) |  |  | 292 |  |  | 8,427 |  |  | (2,370) |  |  | 6,057 |
Net change in fair value of cash flow hedges | (37,764) |  |  | 10,620 |  |  | (27,144) |  |  | (73,390) |  |  | 20,647 |  |  | (52,743) |
Amortization of net actuarial losses | 159 |  |  | (45) |  |  | 114 |  |  | 476 |  |  | (134) |  |  | 342 |
Amortization of net prior service costs | 10 |  |  | (3) |  |  | 7 |  |  | 29 |  |  | (8) |  |  | 21 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 169 |  |  | (48) |  |  | 121 |  |  | 505 |  |  | (142) |  |  | 363 |
Total other comprehensive loss | $ | (93,056) |  |  | $ | 23,451 |  |  | $ | (69,605) |  |  | $ | (240,699) |  |  | $ | 59,447 |  |  | $ | (181,252) |
| Three Months Ended September 30, 2021 |  | Nine Months Ended September 30, 2021
| Pre-Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | (10,337) |  |  | $ | 2,440 |  |  | $ | (7,897) |  |  | $ | (15,589) |  |  | $ | 3,711 |  |  | $ | (11,878) |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (10,337) |  |  | 2,440 |  |  | (7,897) |  |  | (15,589) |  |  | 3,711 |  |  | (11,878) |
Change in fair value of cash flow hedges | 84 |  |  | (23) |  |  | 61 |  |  | (2,214) |  |  | 624 |  |  | (1,590) |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 4,791 |  |  | (1,347) |  |  | 3,444 |  |  | 13,869 |  |  | (3,900) |  |  | 9,969 |
Net change in fair value of cash flow hedges | (4,707) |  |  | 1,324 |  |  | (3,383) |  |  | (16,083) |  |  | 4,524 |  |  | (11,559) |
Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period | — |  |  | — |  |  | — |  |  | 653 |  |  | (184) |  |  | 469 |
Amortization of net actuarial losses | 346 |  |  | (97) |  |  | 249 |  |  | 1,037 |  |  | (291) |  |  | 746 |
Amortization of net prior service costs | 44 |  |  | (13) |  |  | 31 |  |  | 131 |  |  | (37) |  |  | 94 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 390 |  |  | (110) |  |  | 280 |  |  | 1,821 |  |  | (512) |  |  | 1,309 |
Total other comprehensive loss | $ | (14,654) |  |  | $ | 3,654 |  |  | $ | (11,000) |  |  | $ | (29,851) |  |  | $ | 7,723 |  |  | $ | (22,128) |
(1)The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 14 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2021 Form 10-K.
Company's accumulated other comprehensive loss, net of tax | Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the dates indicated:
| Unrealized Gain (Loss) on Securities |  | Unrealized Gain (Loss) on Cash Flow Hedge |  |  |  | Defined Benefit Postretirement Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
| 2022
Beginning balance: January 1, 2022 | $ | (9,667) |  |  | $ | 14,137 |  |  |  |  | $ | (2,287) |  |  | $ | 2,183 |
Net change in other comprehensive income (loss) | (128,872) |  |  | (52,743) |  |  |  |  | 363 |  |  | (181,252) |
Ending balance: September 30, 2022 | $ | (138,539) |  |  | $ | (38,606) |  |  |  |  | $ | (1,924) |  |  | $ | (179,069) |
| 2021
Beginning balance: January 1, 2021 | $ | 13,255 |  |  | $ | 33,276 |  |  |  |  | $ | (5,836) |  |  | $ | 40,695 |
Net change in other comprehensive income (loss) | (11,878) |  |  | (11,559) |  |  |  |  | 1,309 |  |  | (22,128) |
Ending balance: September 30, 2021 | $ | 1,377 |  |  | $ | 21,717 |  |  |  |  | $ | (4,527) |  |  | $ | 18,567 |

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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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