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Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Other Comprehensive Income (Loss) | Other Comprehensive Income (Loss) The following table presents the components of other comprehensive income (loss) both gross and net of tax, for the years ended December 31, 2020, 2019 and 2018 (in thousands):
| For the Years Ended December 31,
| 2020 |  | 2019 |  | 2018
| Before Tax |  | Tax Effect |  | After Tax |  | Before Tax |  | Tax Effect |  | After Tax |  | Before Tax |  | Tax Effect |  | After Tax
Components of Other Comprehensive Income ( Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized losses on available for sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gains (losses) arising during the period | $ | 20,134 |  |  | (5,190) |  |  | 14,944 |  |  | 24,987 |  |  | (6,636) |  |  | 18,351 |  |  | (8,425) |  |  | 2,296 |  |  | (6,129) |
Reclassification adjustment for gains included in net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total | 20,134 |  |  | (5,190) |  |  | 14,944 |  |  | 24,987 |  |  | (6,636) |  |  | 18,351 |  |  | (8,425) |  |  | 2,296 |  |  | (6,129) |
Unrealized (losses) gains on derivatives (cash flow hedges) | (7,099) |  |  | 1,830 |  |  | (5,269) |  |  | (780) |  |  | 201 |  |  | (579) |  |  | 304 |  |  | (83) |  |  | 221 |
Amortization related to post-retirement obligations | 5,604 |  |  | (1,445) |  |  | 4,159 |  |  | (2,176) |  |  | 561 |  |  | (1,615) |  |  | 1,678 |  |  | (457) |  |  | 1,221 |
Total other comprehensive income (loss) | $ | 18,639 |  |  | (4,805) |  |  | 13,834 |  |  | 22,031 |  |  | (5,874) |  |  | 16,157 |  |  | (6,443) |  |  | 1,756 |  |  | (4,687) |
The following table presents the changes in the components of accumulated other comprehensive loss, net of tax, for the years ended December 31, 2020 and 2019 (in thousands):
|  | Changes in Accumulated Other Comprehensive Income by Component, net of tax For the Years Ended December 31,
|  | 2020 |  | 2019
|  | Unrealized Gains on Available for Sale Debt Securities |  | Post-Retirement Obligations |  | Unrealized Gains (Losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive Income |  | Unrealized Gains (Losses) on Available for Sale Debt Securities |  | Post-Retirement Obligations |  | Unrealized Gains (Losses) on Derivatives (cash flow hedges) |  | Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of the period |  | $ | 8,746 |  |  | (5,240) |  |  | 315 |  |  | 3,821 |  |  | (9,605) |  |  | (3,625) |  |  | 894 |  |  | (12,336) |
Current period change in other comprehensive income (loss) |  | 14,944 |  |  | 4,159 |  |  | (5,269) |  |  | 13,834 |  |  | 18,351 |  |  | (1,615) |  |  | (579) |  |  | 16,157 |
Balance at the end of the period |  | $ | 23,690 |  |  | (1,081) |  |  | (4,954) |  |  | 17,655 |  |  | 8,746 |  |  | (5,240) |  |  | 315 |  |  | 3,821 |
The following table summarizes the reclassifications out of accumulated other comprehensive (loss) income for the years ended December 31, 2020, 2019 and 2018 (in thousands):
|  | Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
|  | Amount reclassified from AOCI for the years ended December 31, |  | Affected line item in the Consolidated Statement of Income
|  | 2020 |  | 2019 |  | 2018 |  |
Details of AOCI: |  |  |  |  |  |  |  |
Available for sale debt securities: |  |  |  |  |  |  |  |
Realized net gains on the sale of securities available for sale |  | $ | — |  |  | — |  |  | — |  |  | Net gain on securities transactions
|  | — |  |  | — |  |  | — |  |  | Income tax expense
|  | — |  |  | — |  |  | — |  |  | Net of tax
Post-retirement obligations: |  |  |  |  |  |  |  |
Amortization of actuarial losses |  | 448 |  |  | 189 |  |  | 399 |  |  | Compensation and employee benefits (1)
|  | (115) |  |  | (49) |  |  | (109) |  |  | Income tax expense
|  | 333 |  |  | 140 |  |  | 290 |  |  | Net of tax
Total reclassifications |  | $ | 333 |  |  | 140 |  |  | 290 |  |  | Net of tax
(1) This item is included in the computation of net periodic benefit cost. See Note 13. Benefit Plans

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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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