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Reclassification of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |  |  |  |
Unrealized holding gains on securities arising during the period | $ (4,025) | $ (3,256) | $ (18,122) | $ 22,069 |  |
Reclassification adjustment for gains on securities included in net income | 0 | (20) | (16) | (47) |  |
Total unrealized gains on securities | (4,025) | (3,276) | (18,138) | 22,022 |  |
Unrealized holding (losses) gains on derivatives arising during the period | (529) | 225 | 776 | (4,892) |  |
Unrealized holding gains on securities arising during the period | 844 | 684 | 3,805 | (4,635) |  |
Reclassification adjustment for gains on derivatives included in net income, before Tax | 0 | 0 | 0 | 0 |  |
Total unrealized gain on derivatives | (529) | 225 | 776 | (4,892) |  |
Reclassification adjustment for gains on securities included in net income | 0 | 4 | 3 | 10 |  |
Total other comprehensive (loss) income | (4,554) | (3,051) | (17,362) | 17,130 |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax | 844 | 688 | 3,808 | (4,625) |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 111 | (48) | (163) | 1,027 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | 0 | 0 | 0 | 0 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total | 111 | (48) | (163) | 1,027 |  |
Other Comprehensive Income (Loss), Tax | 955 | 640 | 3,645 | (3,598) |  |
Other comprehensive income (loss) before reclassification adjustment | (3,181) | (2,572) | (14,317) | 17,434 |  |
Total unrealized (losses) gains on securities | (3,181) | (2,588) | (14,330) | 17,397 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (418) | 177 | 613 | (3,865) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | 0 | 0 | 0 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total | (418) | 177 | 613 | (3,865) |  |
Total other comprehensive (loss) income | (3,599) | (2,411) | (13,717) | 13,532 |  |
Reclassification adjustment for gains on securities included in net income | 0 | 16 | 13 | 37 |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 3,516 |  | 3,516 |  | $ 17,233 |
Other comprehensive income (loss) before reclassification adjustment | (3,181) | (2,572) | (14,317) | 17,434 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | (418) | 177 | 613 | (3,865) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 0 | 0 | 0 | 0 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | (529) | 225 | 776 | (4,892) |  |
Other comprehensive income (loss) | (3,599) | (2,411) | (13,717) | 13,532 |  |
Unrealized holding (losses) gains on securities arising during the period | (4,025) | (3,256) | (18,122) | 22,069 |  |
Unrealized holding gains on securities arising during the period | 844 | 684 | 3,805 | (4,635) |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 0 | 20 | 16 | 47 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 | (4) | (3) | (10) |  |
Reclassification adjustment for gains on securities included in net income | 0 | 16 | 13 | 37 |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax | (4,025) | (3,276) | (18,138) | 22,022 |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax | 844 | 688 | 3,808 | (4,625) |  |
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | (3,181) | (2,588) | (14,330) | 17,397 |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax | (529) | 225 | 776 | (4,892) |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax | 111 | (48) | (163) | 1,027 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 0 | 0 | 0 | 0 |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax | 0 | 0 | 0 | 0 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax | 111 | (48) | (163) | 1,027 |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax | (418) | 177 | 613 | (3,865) |  |
Other Comprehensive Income (Loss), before Tax | (4,554) | (3,051) | (17,362) | 17,130 |  |
Other Comprehensive Income (Loss), Tax | 955 | 640 | 3,645 | (3,598) |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |  |  |  |
Other comprehensive income (loss) before reclassification adjustment | (3,181) | (2,572) | (14,317) | 17,434 |  |
Total other comprehensive (loss) income | (3,181) | (2,588) | (14,330) | 17,397 |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 5,980 | 21,977 | 5,980 | 21,977 | 20,310 | $ 4,580
Other comprehensive income (loss) before reclassification adjustment | (3,181) | (2,572) | (14,317) | 17,434 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | (16) | (13) | (37) |  |
Other comprehensive income (loss) | (3,181) | (2,588) | (14,330) | 17,397 |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |  |  |  |
Other comprehensive income (loss) before reclassification adjustment | 0 | 0 | 0 | 0 |  |
Total other comprehensive (loss) income | 0 | 0 | 0 | 0 |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (182) | 365 | (182) | 365 | (182) | 365
Other comprehensive income (loss) before reclassification adjustment | 0 | 0 | 0 | 0 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |
Other comprehensive income (loss) | 0 | 0 | 0 | 0 |  |
Derivative [Member] |  |  |  |  |  |
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |  |  |  |
Total other comprehensive (loss) income | (418) | 177 | 613 | (3,865) |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | (2,282) | (3,231) | (2,282) | (3,231) | (2,895) | 634
Other comprehensive income (loss) | (418) | 177 | 613 | (3,865) |  |
Accumulated Other Comprehensive Income (Loss), net [Member] |  |  |  |  |  |
Supplemental Comprehensive Income Disclosures [Abstract] |  |  |  |  |  |
Total other comprehensive (loss) income | (3,599) | (2,411) | (13,717) | 13,532 |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 3,516 | 19,111 | 3,516 | 19,111 | $ 17,233 | $ 5,579
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (3,599) | (2,395) | (13,704) | 13,569 |  |
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | (16) | (13) | (37) |  |
Other comprehensive income (loss) | $ (3,599) | $ (2,411) | $ (13,717) | $ 13,532 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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