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Comprehensive Income/Loss (Tables) | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Comprehensive income | The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the dates indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
| Three Months Ended March 31, 2020
| Pre Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | 12,123 |  |  | $ | (2,776 | ) |  | $ | 9,347 |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | 12,123 |  |  | (2,776 | ) |  | 9,347 |
Change in fair value of cash flow hedges | 33,567 |  |  | (9,443 | ) |  | 24,124 |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 1,586 |  |  | (446 | ) |  | 1,140 |
Net change in fair value of cash flow hedges | 31,981 |  |  | (8,997 | ) |  | 22,984 |
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period | (1,389 | ) |  | 391 |  |  | (998 | )
Amortization of net actuarial losses | 245 |  |  | (69 | ) |  | 176 |
Amortization of net prior service costs | 69 |  |  | (19 | ) |  | 50 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | (1,075 | ) |  | 303 |  |  | (772 | )
Total other comprehensive income | $ | 43,029 |  |  | $ | (11,470 | ) |  | $ | 31,559 |
| Three Months Ended March 31, 2019
| Pre Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | 6,178 |  |  | $ | (1,449 | ) |  | $ | 4,729 |
Less: net security gains reclassified into other noninterest income (expense) | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | 6,178 |  |  | (1,449 | ) |  | 4,729 |
Change in fair value of cash flow hedges | 4,996 |  |  | (1,406 | ) |  | 3,590 |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 424 |  |  | (119 | ) |  | 305 |
Net change in fair value of cash flow hedges | 4,572 |  |  | (1,287 | ) |  | 3,285 |
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period | (11 | ) |  | 3 |  |  | (8 | )
Amortization of net actuarial gains | (2 | ) |  | 1 |  |  | (1 | )
Amortization of net prior service costs | 69 |  |  | (20 | ) |  | 49 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 56 |  |  | (16 | ) |  | 40 |
Total other comprehensive income | $ | 10,806 |  |  | $ | (2,752 | ) |  | $ | 8,054 |
(1) The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2019, filed with the Securities and Exchange Commission.
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 periods indicated:
| Unrealized Gain (Loss) on Securities |  | Unrealized Gain on Cash Flow Hedge |  | Defined Benefit Postretirement Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
| 2020
Beginning balance: January 1, 2020 | $ | 4,398 |  |  | $ | 16,479 |  |  | $ | (2,708 | ) |  | $ | 18,169 |
Net change in other comprehensive income (loss) | 9,347 |  |  | 22,984 |  |  | (772 | ) |  | 31,559 |
Ending balance: March 31, 2020 | $ | 13,745 |  |  | $ | 39,463 |  |  | $ | (3,480 | ) |  | $ | 49,728 |
| 2019
Beginning balance: January 1, 2019 | $ | (5,947 | ) |  | $ | 6,148 |  |  | $ | (1,374 | ) |  | $ | (1,173 | )
Net change in other comprehensive income (loss) | 4,729 |  |  | 3,285 |  |  | 40 |  |  | 8,054 |
Ending balance: March 31, 2019 | $ | (1,218 | ) |  | $ | 9,433 |  |  | $ | (1,334 | ) |  | $ | 6,881 |

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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 http://asc.fasb.org/extlink&oid=118930883&loc=d3e526-108580 + Details
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