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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Change in net unrealized gain (loss) on securities available for sale, tax | $ (17,669) | $ 32,166 | $ (29,740)
Change in the non-credit portion of OTTI losses recognized in other comprehensive income (loss), tax | 0 | (821) | (13)
Change in pension and post-retirement obligations, tax | (5,033) | (4,897) | (2,234)
Cash flow hedge, gain (loss), reclassification, tax | (376) |  |
Reclassification adjustment for sales of available-for-sale securities, tax | 1,527 | $ (4) | $ 1,245
Cash flow hedges tax component | $ 43 |  |

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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale category and out of the held-to-maturity category. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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