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Accumulated Other Comprehensive Income (Loss) - Changes in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity [Abstract] |  |  |  |
Unrealized loss on securities, before tax amount | $ (27,975) | $ 5,565 | $ (20,796) | $ 72,146
Unrealized loss on securities, tax effect | 6,353 | (1,232) | 4,723 | (15,960)
Unrealized loss on securities, net of tax amount | (21,622) | 4,333 | (16,073) | 56,186
Reclassification adjustment for securities gain included in net income, before tax amount | 0 | (2) | (33,511) | (3,053)
Reclassification adjustment for securities gain included in net income, tax effect | 0 | 1 | 7,610 | 676
Reclassification adjustment for securities gain included in net income, net of tax amount | 0 | (1) | (25,901) | (2,377)
Amortization of net unrealized losses on AFS securities transferred to HTM. before-tax amount | 824 | 1,192 | 2,787 | 3,232
Amortization of net unrealized losses on AFS securities transferred to HTM, tax | (187) | (264) | (633) | (715)
Amortization of net unrealized losses on AFS securities transferred to HTM, net of tax amount | 637 | 928 | 2,154 | 2,517
Net unrealized losses on interest rate swaps used in cash flow hedges, before-tax amount | (1,153) |  | (678) |
Net unrealized losses on interest rate swaps used in cash flow hedges, tax | (262) |  | (154) |
Net unrealized losses on interest rate swaps used in cash flow hedges, net of tax amount | (891) |  | (524) |
Amortization of net unrecognized pension and postretirement items, before tax amount | 371 | 329 | 1,111 | 984
Amortization of net unrecognized pension and postretirement items, tax effect | (81) | (73) | (243) | (219)
Amortization of net unrecognized pension and postretirement items, net of tax amount | 290 | 255 | 868 | 765
Total Other Comprehensive Income, Before Tax Amount | (27,933) | 7,083 | (51,087) | 73,309
Total Other Comprehensive Income, Tax Effect | 6,347 | (1,568) | 11,611 | (16,218)
Other Comprehensive (Loss)/Income | $ (21,586) | $ 5,515 | $ (39,476) | $ 57,091

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- Definition Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + 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=124509347&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration