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Accumulated Other Comprehensive Income | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Accumulated Other Comprehensive Income | Accumulated Other Comprehensive Income The following table presents changes in OCI:
| Before-Tax Amount |  | Tax Effect |  | Net of Tax Amount
Three months ended March 31, 2021 | (in thousands)
Unrealized loss on securities | $ | (51,751) |  |  | $ | 11,753 |  |  | $ | (39,999) |
Reclassification adjustment for securities gains included in net income (1) | 487 |  |  | (110) |  |  | 377 |
Amortization of net unrealized losses on AFS securities transferred to HTM (2) | 2,312 |  |  | (525) |  |  | 1,787 |
Net unrealized loss on interest rate swaps used in cash flow hedges (3) | (2,209) |  |  | 502 |  |  | (1,707) |
Amortization of net unrecognized pension and postretirement items (4) | 370 |  |  | (81) |  |  | 289 |
Total OCI | $ | (50,791) |  |  | $ | 11,538 |  |  | $ | (39,253) |
Three months ended March 31, 2020 |  |  |  |  |
Unrealized gain on securities | $ | 22,380 |  |  | $ | (4,949) |  |  | $ | 17,431 |
Reclassification adjustment for securities gains included in net income (1) | (46) |  |  | 10 |  |  | (36) |
Amortization of net unrealized losses on AFS securities transferred to HTM (2) | 1,022 |  |  | (227) |  |  | 795 |
Amortization of net unrecognized pension and postretirement items (4) | 328 |  |  | (73) |  |  | 255 |
Total OCI | $ | 23,684 |  |  | $ | (5,239) |  |  | $ | 18,445 |
(1) Amounts reclassified out of AOCI. Before-tax amounts included in "Investment securities gains, net" on the Consolidated Statements of Income. See Note 3, "Investment Securities," for additional details. (2) Amounts reclassified out of AOCI. Before-tax amounts included as a reduction to "Interest Income" on the Consolidated Statements of Income. (3) Amounts reclassified out of AOCI. Before-tax amounts included in "Interest Income" on the Consolidated Statements of Income. (4) Amounts reclassified out of AOCI. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income. See Note 12, "Employee Benefit Plans," for additional details. The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax:
| Unrealized Gains (Losses) on Investment Securities |  | Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges |  |  |  | Unrecognized Pension and Postretirement Plan Income (Costs) |  | Total
| (in thousands)
Three months ended March 31, 2021 |  |  |  |  |  |  |  |  |
Balance at December 31, 2020 | $ | 81,604 |  |  | $ | — |  |  |  |  | $ | (16,513) |  |  | $ | 65,091 |
OCI before reclassifications | (39,999) |  |  | — |  |  |  |  | — |  |  | (39,999) |
Amounts reclassified from AOCI | 377 |  |  | (1,707) |  |  |  |  | 289 |  |  | (1,042) |
Amortization of net unrealized losses on AFS securities transferred to HTM | 1,787 |  |  | — |  |  |  |  | — |  |  | 1,787 |
Balance at March 31, 2021 | $ | 43,769 |  |  | $ | (1,707) |  |  |  |  | $ | (16,224) |  |  | $ | 25,838 |
Three months ended March 31, 2020 |  |  |  |  |  |  |  |  |
Balance at December 31, 2019 | $ | 14,864 |  |  | $ | — |  |  |  |  | $ | (15,001) |  |  | $ | (137) |
OCI before reclassifications | 17,431 |  |  | — |  |  |  |  | — |  |  | 17,431 |
Amounts reclassified from AOCI | (36) |  |  | — |  |  |  |  | 255 |  |  | 219 |
Amortization of net unrealized losses on AFS securities transferred to HTM | 795 |  |  | — |  |  |  |  | — |  |  | 795 |
Balance at March 31, 2020 | $ | 33,054 |  |  | $ | — |  |  |  |  | $ | (14,746) |  |  | $ | 18,308 |

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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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