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Comprehensive Income/Loss (Tables) | 6 Months Ended
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Jun. 30, 2023
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 June 30, 2023 |  | Six Months Ended June 30, 2023
| 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 | $ | (14,993) |  |  | $ | 3,542 |  |  | $ | (11,451) |  |  | $ | 7,192 |  |  | $ | (1,575) |  |  | $ | 5,617 |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (14,993) |  |  | 3,542 |  |  | (11,451) |  |  | 7,192 |  |  | (1,575) |  |  | 5,617 |
Change in fair value of cash flow hedges | (14,599) |  |  | 4,105 |  |  | (10,494) |  |  | (6,700) |  |  | 1,884 |  |  | (4,816) |
Less: net cash flow hedge losses reclassified into interest income or interest expense | (7,020) |  |  | 1,974 |  |  | (5,046) |  |  | (13,259) |  |  | 3,728 |  |  | (9,531) |
Net change in fair value of cash flow hedges | (7,579) |  |  | 2,131 |  |  | (5,448) |  |  | 6,559 |  |  | (1,844) |  |  | 4,715 |
Amortization of net actuarial gains | (137) |  |  | 39 |  |  | (98) |  |  | (274) |  |  | 77 |  |  | (197) |
Amortization of net prior service costs | 9 |  |  | (2) |  |  | 7 |  |  | 19 |  |  | (5) |  |  | 14 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | (128) |  |  | 37 |  |  | (91) |  |  | (255) |  |  | 72 |  |  | (183) |
Total other comprehensive (loss) income | $ | (22,700) |  |  | $ | 5,710 |  |  | $ | (16,990) |  |  | $ | 13,496 |  |  | $ | (3,347) |  |  | $ | 10,149 |
| Three Months Ended June 30, 2022 |  | Six Months Ended June 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 | $ | (30,734) |  |  | $ | 7,000 |  |  | $ | (23,734) |  |  | $ | (112,353) |  |  | $ | 26,063 |  |  | $ | (86,290) |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (30,734) |  |  | 7,000 |  |  | (23,734) |  |  | (112,353) |  |  | 26,063 |  |  | (86,290) |
Change in fair value of cash flow hedges | (7,126) |  |  | 2,004 |  |  | (5,122) |  |  | (27,606) |  |  | 7,772 |  |  | (19,834) |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 3,515 |  |  | (988) |  |  | 2,527 |  |  | 8,020 |  |  | (2,255) |  |  | 5,765 |
Net change in fair value of cash flow hedges | (10,641) |  |  | 2,992 |  |  | (7,649) |  |  | (35,626) |  |  | 10,027 |  |  | (25,599) |
Amortization of net actuarial losses | 158 |  |  | (44) |  |  | 114 |  |  | 317 |  |  | (89) |  |  | 228 |
Amortization of net prior service costs | 9 |  |  | (2) |  |  | 7 |  |  | 19 |  |  | (5) |  |  | 14 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 167 |  |  | (46) |  |  | 121 |  |  | 336 |  |  | (94) |  |  | 242 |
Total other comprehensive loss | $ | (41,208) |  |  | $ | 9,946 |  |  | $ | (31,262) |  |  | $ | (147,643) |  |  | $ | 35,996 |  |  | $ | (111,647) |
(1)The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 13 - Employee Benefit Plans within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2022 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)
| 2023
Beginning balance: January 1, 2023 | $ | (128,657) |  |  | $ | (36,630) |  |  |  |  | $ | 2,203 |  |  | $ | (163,084) |
Net change in other comprehensive income (loss) | 5,617 |  |  | 4,715 |  |  |  |  | (183) |  |  | 10,149 |
Ending balance: June 30, 2023 | $ | (123,040) |  |  | $ | (31,915) |  |  |  |  | $ | 2,020 |  |  | $ | (152,935) |
| 2022
Beginning balance: January 1, 2022 | $ | (9,667) |  |  | $ | 14,137 |  |  |  |  | $ | (2,287) |  |  | $ | 2,183 |
Net change in other comprehensive income (loss) | (86,290) |  |  | (25,599) |  |  |  |  | 242 |  |  | (111,647) |
Ending balance: June 30, 2022 | $ | (95,957) |  |  | $ | (11,462) |  |  |  |  | $ | (2,045) |  |  | $ | (109,464) |

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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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