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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income |  | $ 34,873 | $ 51,845 | $ 86,526 | $ 117,698
Other comprehensive income (loss), net of tax |  |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax |  | (709) | 2,175 | 10,333 | 12,349
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | (2,729) | 3,030 | 20,452 | 14,905
Net change in other comprehensive income for defined benefit postretirement plans | [1] | 225 | 41 | (322) | 121
Total other comprehensive income (loss) |  | (3,213) | 5,246 | 30,463 | 27,375
Total comprehensive income |  | $ 31,660 | $ 57,091 | $ 116,989 | $ 145,073
[1] | 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, 2020 |  | Nine Months Ended September 30, 2020
| 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 | $ | (857) |  |  | $ | 148 |  |  | $ | (709) |  |  | $ | 13,598 |  |  | $ | (3,265) |  |  | $ | 10,333 |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (857) |  |  | 148 |  |  | (709) |  |  | 13,598 |  |  | (3,265) |  |  | 10,333 |
Change in fair value of cash flow hedges | (143) |  |  | 41 |  |  | (102) |  |  | 37,674 |  |  | (10,597) |  |  | 27,077 |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 4,339 |  |  | (1,220) |  |  | 3,119 |  |  | 9,901 |  |  | (2,784) |  |  | 7,117 |
Less: Loss on termination of hedge reclassified into noninterest expense | (684) |  |  | 192 |  |  | (492) |  |  | (684) |  |  | 192 |  |  | (492) |
Net change in fair value of cash flow hedges | (3,798) |  |  | 1,069 |  |  | (2,729) |  |  | 28,457 |  |  | (8,005) |  |  | 20,452 |
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period | (2) |  |  | 1 |  |  | (1) |  |  | (1,392) |  |  | 392 |  |  | (1,000) |
Amortization of net actuarial losses | 245 |  |  | (69) |  |  | 176 |  |  | 736 |  |  | (207) |  |  | 529 |
Amortization of net prior service costs | 69 |  |  | (19) |  |  | 50 |  |  | 207 |  |  | (58) |  |  | 149 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 312 |  |  | (87) |  |  | 225 |  |  | (449) |  |  | 127 |  |  | (322) |
Total other comprehensive income (loss) | $ | (4,343) |  |  | $ | 1,130 |  |  | $ | (3,213) |  |  | $ | 41,606 |  |  | $ | (11,143) |  |  | $ | 30,463 |
| Three Months Ended September 30, 2019 |  | Nine Months Ended September 30, 2019
| 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 | $ | 2,858 |  |  | $ | (683) |  |  | $ | 2,175 |  |  | $ | 14,699 |  |  | $ | (3,401) |  |  | $ | 11,298 |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | (1,462) |  |  | 411 |  |  | (1,051) |
Net change in fair value of securities available for sale | 2,858 |  |  | (683) |  |  | 2,175 |  |  | 16,161 |  |  | (3,812) |  |  | 12,349 |
Change in fair value of cash flow hedges | 4,568 |  |  | (1,285) |  |  | 3,283 |  |  | 21,913 |  |  | (6,167) |  |  | 15,746 |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 352 |  |  | (99) |  |  | 253 |  |  | 1,170 |  |  | (329) |  |  | 841 |
Net change in fair value of cash flow hedges | 4,216 |  |  | (1,186) |  |  | 3,030 |  |  | 20,743 |  |  | (5,838) |  |  | 14,905 |
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period | (11) |  |  | 3 |  |  | (8) |  |  | (33) |  |  | 9 |  |  | (24) |
Amortization of net actuarial gains | (2) |  |  | 1 |  |  | (1) |  |  | (6) |  |  | 2 |  |  | (4) |
Amortization of net prior service costs | 69 |  |  | (19) |  |  | 50 |  |  | 207 |  |  | (58) |  |  | 149 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 56 |  |  | (15) |  |  | 41 |  |  | 168 |  |  | (47) |  |  | 121 |
Total other comprehensive income | $ | 7,130 |  |  | $ | (1,884) |  |  | $ | 5,246 |  |  | $ | 37,072 |  |  | $ | (9,697) |  |  | $ | 27,375 |
(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.

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