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Comprehensive Income/Loss | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
COMPREHENSIVE INCOME/LOSS | OTHER COMPREHENSIVE INCOME (LOSS) 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 March 31, 2021
|  |  |  |  |  |  | Pre Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
|  |  |  |  |  |  | (Dollars in thousands)
Change in fair value of securities available for sale |  |  |  |  |  |  | $ | (10,361) |  |  | $ | 2,587 |  |  | $ | (7,774) |
Less: net security losses reclassified into other noninterest expense |  |  |  |  |  |  | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale |  |  |  |  |  |  | (10,361) |  |  | 2,587 |  |  | (7,774) |
Change in fair value of cash flow hedges |  |  |  |  |  |  | (4,779) |  |  | 1,344 |  |  | (3,435) |
Less: net cash flow hedge gains reclassified into interest income or interest expense |  |  |  |  |  |  | 4,380 |  |  | (1,232) |  |  | 3,148 |
Net change in fair value of cash flow hedges |  |  |  |  |  |  | (9,159) |  |  | 2,576 |  |  | (6,583) |
Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period |  |  |  |  |  |  | 653 |  |  | (184) |  |  | 469 |
Amortization of net actuarial losses |  |  |  |  |  |  | 442 |  |  | (124) |  |  | 318 |
Amortization of net prior service costs |  |  |  |  |  |  | 44 |  |  | (12) |  |  | 32 |
Net change in other comprehensive income for defined benefit postretirement plans (1) |  |  |  |  |  |  | 1,139 |  |  | (320) |  |  | 819 |
Total other comprehensive loss |  |  |  |  |  |  | $ | (18,381) |  |  | $ | 4,843 |  |  | $ | (13,538) |
|  |  | 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 |
(1)The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 15 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2020 Form 10-K. 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 on Cash Flow Hedge |  |  |  | Defined Benefit Postretirement Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in thousands)
| 2021
Beginning balance: January 1, 2021 | $ | 13,255 |  |  | $ | 33,276 |  |  |  |  | $ | (5,836) |  |  | $ | 40,695 |
Net change in other comprehensive income (loss) | (7,774) |  |  | (6,583) |  |  |  |  | 819 |  |  | (13,538) |
Ending balance: March 31, 2021 | $ | 5,481 |  |  | $ | 26,693 |  |  |  |  | $ | (5,017) |  |  | $ | 27,157 |
| 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 |

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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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