"You are an auditor for XBRL filings. \nGiven two concepts and the provided filing (schema, presentation, calculation, definition, label, instance, and US GAAP taxonomy),\ndetermine which one of the following erroneous relationship types best describes the relationship between the two concepts:\n\n(1) Reversal  \n    Definition: A relationship is flagged as Reversal when the filer\u2019s extension taxonomy redefines element hierarchy inconsistently with the US GAAP taxonomy. Specifically, this occurs when an element that should be a sibling in the US GAAP taxonomy is instead defined as a child of another element (or vice versa, a child element is incorrectly redefined as a sibling).\n\n(2) Inappropriateness  \n    Definition: A relationship is flagged as Inappropriateness when elements appear under an abstract category where they do not belong, contrary to the US GAAP taxonomy.\n\n(3) CombinationErr  \n    Definition: A relationship is flagged as CombinationErr when an axis in the filer\u2019s extension taxonomy is associated with inappropriate members not permitted by the US GAAP taxonomy.\n\nYou must reference the US GAAP taxonomy to retrieve and check the two concepts across the entire filing.\nOutput only one of the following labels exactly, chosen strictly from:\n[\"Reversal\", \"Inappropriateness\", \"CombinationErr\"].\n\nNo explanations. No extra text. Only the label.\n\n    \n##Schema document\nNone\n\n##Presentation linkbase document\n<?xml version='1.0' encoding='US-ASCII'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:roleRef roleURI=\"http://www.chpk.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited\" xlink:type=\"simple\" xlink:href=\"cpk-20230630.xsd#CondensedConsolidatedStatementsofStockholdersEquityUnaudited\"/>\n  <link:presentationLink xlink:role=\"http://www.chpk.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited\" xlink:type=\"extended\">\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementOfStockholdersEquityAbstract_9f7fbc81-5a17-459b-9ccd-cb740d677584\" 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xlink:to=\"loc_us-gaap_SharesIssued_959cfc13-26db-41e8-bd1d-158cc68fe0f5\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/periodEndLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity_f32d688d-5857-48e9-923a-be8aaf559813\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:presentationArc order=\"14\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f114cdaa-7b3a-4497-b2f4-3a3272d0562f\" xlink:to=\"loc_us-gaap_StockholdersEquity_f32d688d-5857-48e9-923a-be8aaf559813\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/periodEndLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_198fc44e-645a-4120-b002-e1922f271c1b\" xlink:href=\"cpk-20230630.xsd#cpk_SharesHeldInTrustForDeferredCompensationPlan\"/>\n    <link:presentationArc order=\"5\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_633164f1-2450-476a-8a9f-1bb988e853c6\" xlink:to=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_198fc44e-645a-4120-b002-e1922f271c1b\" xlink:type=\"arc\" preferredLabel=\"http://www.xbrl.org/2003/role/terseLabel\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2938f920-db56-4244-8b89-4e324c912404\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\"/>\n    <link:presentationArc order=\"6\" xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/parent-child\" xlink:from=\"loc_us-gaap_StatementLineItems_633164f1-2450-476a-8a9f-1bb988e853c6\" xlink:to=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2938f920-db56-4244-8b89-4e324c912404\" xlink:type=\"arc\" 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xlink:href=\"cpk-20230630.xsd#CondensedConsolidatedStatementsofStockholdersEquityUnaudited\"/>\n  <link:definitionLink xlink:role=\"http://www.chpk.com/role/CondensedConsolidatedStatementsofStockholdersEquityUnaudited\" xlink:type=\"extended\" id=\"id593d3bf575e45eda9b2ff57ee093ce1_CondensedConsolidatedStatementsofStockholdersEquityUnaudited\">\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementLineItems_633164f1-2450-476a-8a9f-1bb988e853c6\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockDividendsPerShareDeclared_351a3502-37df-40c8-82e6-9bcd6a5222a6\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockDividendsPerShareDeclared\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_633164f1-2450-476a-8a9f-1bb988e853c6\" 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xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_c80bd1ea-73e3-48a5-9e7a-83091a25c58c\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f114cdaa-7b3a-4497-b2f4-3a3272d0562f\" xlink:to=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_c80bd1ea-73e3-48a5-9e7a-83091a25c58c\" xlink:type=\"arc\" order=\"11\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue_0dd91990-f56c-4622-a4c0-39aa495332a5\" xlink:href=\"cpk-20230630.xsd#cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_f114cdaa-7b3a-4497-b2f4-3a3272d0562f\" xlink:to=\"loc_cpk_TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue_0dd91990-f56c-4622-a4c0-39aa495332a5\" xlink:type=\"arc\" order=\"12\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesIssued_959cfc13-26db-41e8-bd1d-158cc68fe0f5\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity_f32d688d-5857-48e9-923a-be8aaf559813\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_198fc44e-645a-4120-b002-e1922f271c1b\" xlink:href=\"cpk-20230630.xsd#cpk_SharesHeldInTrustForDeferredCompensationPlan\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_633164f1-2450-476a-8a9f-1bb988e853c6\" xlink:to=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan_198fc44e-645a-4120-b002-e1922f271c1b\" xlink:type=\"arc\" order=\"4\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2938f920-db56-4244-8b89-4e324c912404\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_StatementLineItems_633164f1-2450-476a-8a9f-1bb988e853c6\" xlink:to=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_2938f920-db56-4244-8b89-4e324c912404\" xlink:type=\"arc\" order=\"5\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementTable_cf599b0a-0b6a-4d94-a319-cbdf87cfb5c5\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/all\" xlink:from=\"loc_us-gaap_StatementLineItems_633164f1-2450-476a-8a9f-1bb988e853c6\" xlink:to=\"loc_us-gaap_StatementTable_cf599b0a-0b6a-4d94-a319-cbdf87cfb5c5\" xlink:type=\"arc\" order=\"1\" xbrldt:closed=\"true\" xbrldt:contextElement=\"segment\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementEquityComponentsAxis_45b84883-b104-48b4-ad20-6a750b1b5ea4\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/hypercube-dimension\" xlink:from=\"loc_us-gaap_StatementTable_cf599b0a-0b6a-4d94-a319-cbdf87cfb5c5\" xlink:to=\"loc_us-gaap_StatementEquityComponentsAxis_45b84883-b104-48b4-ad20-6a750b1b5ea4\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_EquityComponentDomain_45b84883-b104-48b4-ad20-6a750b1b5ea4_default\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-default\" xlink:from=\"loc_us-gaap_StatementEquityComponentsAxis_45b84883-b104-48b4-ad20-6a750b1b5ea4\" xlink:to=\"loc_us-gaap_EquityComponentDomain_45b84883-b104-48b4-ad20-6a750b1b5ea4_default\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/dimension-domain\" xlink:from=\"loc_us-gaap_StatementEquityComponentsAxis_45b84883-b104-48b4-ad20-6a750b1b5ea4\" xlink:to=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockMember_fb9f36a9-22fd-4986-8e2d-4960facc7c3f\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_CommonStockMember_fb9f36a9-22fd-4986-8e2d-4960facc7c3f\" xlink:type=\"arc\" order=\"0\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AdditionalPaidInCapitalMember_c1efd2e5-89fa-4a51-885b-220f63b92d69\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_AdditionalPaidInCapitalMember_c1efd2e5-89fa-4a51-885b-220f63b92d69\" xlink:type=\"arc\" order=\"1\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RetainedEarningsMember_5c2c4315-507b-4c6b-b45d-8d186422d296\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_RetainedEarningsMember_5c2c4315-507b-4c6b-b45d-8d186422d296\" xlink:type=\"arc\" order=\"2\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_15a0de31-31bc-4974-9fe5-337b2725b8bf\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_15a0de31-31bc-4974-9fe5-337b2725b8bf\" xlink:type=\"arc\" order=\"3\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember_913b239a-d04a-466d-a00e-b20e491a42e9\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationShareBasedPaymentsMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember_913b239a-d04a-466d-a00e-b20e491a42e9\" xlink:type=\"arc\" order=\"4\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockMember_5ee6e1c3-6e0b-4df6-a1e6-06e7540d5157\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_TreasuryStockMember_5ee6e1c3-6e0b-4df6-a1e6-06e7540d5157\" xlink:type=\"arc\" order=\"5\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockPreferredMember_87e99485-e3d6-43c8-afd2-ba619117b3e5\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockPreferredMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_TreasuryStockPreferredMember_87e99485-e3d6-43c8-afd2-ba619117b3e5\" xlink:type=\"arc\" order=\"6\"/>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockCommonMember_5f30f673-4066-4471-87e2-49f4147d0405\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember\"/>\n    <link:definitionArc xlink:arcrole=\"http://xbrl.org/int/dim/arcrole/domain-member\" xlink:from=\"loc_us-gaap_EquityComponentDomain_1774f84d-7d60-4bf1-a440-196122e0220e\" xlink:to=\"loc_us-gaap_TreasuryStockCommonMember_5f30f673-4066-4471-87e2-49f4147d0405\" xlink:type=\"arc\" order=\"7\"/>\n  </link:definitionLink>\n  </link:linkbase>\n\n\n##Label linkbase document\n<?xml version='1.0' encoding='UTF-8'?>\n<link:linkbase xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd\"><link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedPeriodStartLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/netLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedNetLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedTerseLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedPeriodEndLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel\"/>\n  <link:roleRef roleURI=\"http://www.xbrl.org/2009/role/negatedTotalLabel\" xlink:type=\"simple\" xlink:href=\"http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel\"/>\n  <link:labelLink xlink:role=\"http://www.xbrl.org/2003/role/link\" xlink:type=\"extended\"><link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:to=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_f1170ada-6d61-4aaa-b635-211d128d4f07_terseLabel_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation</link:label>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_7b9c76c4-24fa-4170-83b3-efe1e71c8d96_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares issued under the performance incentive plan withheld for employee taxes (shares)</link:label>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_9a987330-7c35-4d0b-9033-e21490bb5759_netLabel_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2009/role/netLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation</link:label>\n    <link:label id=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_label_en-US\" xlink:label=\"lab_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockDividendsPerShareDeclared\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:to=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_CommonStockDividendsPerShareDeclared_2a12f05a-487c-4488-a61e-9f279ad48df0_terseLabel_en-US\" xlink:label=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock, Dividends, Per Share, Declared</link:label>\n    <link:label id=\"lab_us-gaap_CommonStockDividendsPerShareDeclared_60e54814-2651-4e77-96f0-161832c31b37_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Dividend declared (in dollars per share)</link:label>\n    <link:label id=\"lab_us-gaap_CommonStockDividendsPerShareDeclared_label_en-US\" xlink:label=\"lab_us-gaap_CommonStockDividendsPerShareDeclared\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock, Dividends, Per Share, Declared</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementOfStockholdersEquityAbstract\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:to=\"lab_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StatementOfStockholdersEquityAbstract_1942b056-de70-46aa-9bda-953de2ca73e3_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement of Stockholders' Equity [Abstract]</link:label>\n    <link:label id=\"lab_us-gaap_StatementOfStockholdersEquityAbstract_label_en-US\" xlink:label=\"lab_us-gaap_StatementOfStockholdersEquityAbstract\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement of Stockholders' Equity [Abstract]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_TreasuryStockMember\" xlink:to=\"lab_us-gaap_TreasuryStockMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_TreasuryStockMember_608fde82-ea83-4b69-b07c-258537ec2fb8_terseLabel_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock [Member]</link:label>\n    <link:label id=\"lab_us-gaap_TreasuryStockMember_label_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock [Member] (Deprecated 2023)</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockPreferredMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockPreferredMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_TreasuryStockPreferredMember\" xlink:to=\"lab_us-gaap_TreasuryStockPreferredMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_TreasuryStockPreferredMember_a8025d9c-e4e9-46ea-b68f-74dcd00d8776_terseLabel_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockPreferredMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Preferred</link:label>\n    <link:label id=\"lab_us-gaap_TreasuryStockPreferredMember_label_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockPreferredMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Preferred [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_NetIncomeLoss\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_NetIncomeLoss\" xlink:to=\"lab_us-gaap_NetIncomeLoss\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_NetIncomeLoss_6de91352-f0fd-4b4a-8483-3c5aa1ac0f96_totalLabel_en-US\" xlink:label=\"lab_us-gaap_NetIncomeLoss\" xlink:role=\"http://www.xbrl.org/2003/role/totalLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Net Income</link:label>\n    <link:label id=\"lab_us-gaap_NetIncomeLoss_28d75ca7-8ea6-41eb-8ddf-4d2eb4e10024_terseLabel_en-US\" xlink:label=\"lab_us-gaap_NetIncomeLoss\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Net Income</link:label>\n    <link:label id=\"lab_us-gaap_NetIncomeLoss_label_en-US\" xlink:label=\"lab_us-gaap_NetIncomeLoss\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Net Income (Loss)</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_AcceleratedVestedSharesMember\" xlink:href=\"cpk-20230630.xsd#cpk_AcceleratedVestedSharesMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_AcceleratedVestedSharesMember\" xlink:to=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_AcceleratedVestedSharesMember_ec36b1c8-194b-4a6d-a726-a5df3699baa5_terseLabel_en-US\" xlink:label=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Accelerated Vested Shares [Member]</link:label>\n    <link:label id=\"lab_cpk_AcceleratedVestedSharesMember_label_en-US\" xlink:label=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Accelerated Vested Shares [Member]</link:label>\n    <link:label id=\"lab_cpk_AcceleratedVestedSharesMember_documentation_en-US\" xlink:label=\"lab_cpk_AcceleratedVestedSharesMember\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Accelerated Vested Shares [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_Dividends\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Dividends\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_Dividends\" xlink:to=\"lab_us-gaap_Dividends\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_Dividends_6d01ebe5-6506-4f10-9959-d385a8c5bccf_negatedTerseLabel_en-US\" xlink:label=\"lab_us-gaap_Dividends\" xlink:role=\"http://www.xbrl.org/2009/role/negatedTerseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Dividend declared</link:label>\n    <link:label id=\"lab_us-gaap_Dividends_label_en-US\" xlink:label=\"lab_us-gaap_Dividends\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Dividends</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_CommonStockMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_CommonStockMember\" xlink:to=\"lab_us-gaap_CommonStockMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_CommonStockMember_063711a8-5c75-4319-bdd7-c832d8b2e8ce_terseLabel_en-US\" xlink:label=\"lab_us-gaap_CommonStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock [Member]</link:label>\n    <link:label id=\"lab_us-gaap_CommonStockMember_label_en-US\" xlink:label=\"lab_us-gaap_CommonStockMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Common Stock [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_RetainedEarningsMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_RetainedEarningsMember\" xlink:to=\"lab_us-gaap_RetainedEarningsMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_RetainedEarningsMember_5b7c5bad-a834-4e65-8bdc-5c2c991c36b0_terseLabel_en-US\" xlink:label=\"lab_us-gaap_RetainedEarningsMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Retained Earnings [Member]</link:label>\n    <link:label id=\"lab_us-gaap_RetainedEarningsMember_label_en-US\" xlink:label=\"lab_us-gaap_RetainedEarningsMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Retained Earnings [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AdditionalPaidInCapitalMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_AdditionalPaidInCapitalMember\" xlink:to=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_AdditionalPaidInCapitalMember_b97308e9-5b9e-4283-b175-a719d35c42dd_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Additional Paid-In Capital [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AdditionalPaidInCapitalMember_edb34790-d069-473e-bc61-15b1350c35a5_terseLabel_en-US\" xlink:label=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Additional Paid-in Capital [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AdditionalPaidInCapitalMember_label_en-US\" xlink:label=\"lab_us-gaap_AdditionalPaidInCapitalMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Additional Paid-in Capital [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_EquityComponentDomain\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_EquityComponentDomain\" xlink:to=\"lab_us-gaap_EquityComponentDomain\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_EquityComponentDomain_c4cab279-0dc4-4d3a-a054-de2644f8018b_terseLabel_en-US\" xlink:label=\"lab_us-gaap_EquityComponentDomain\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Component [Domain]</link:label>\n    <link:label id=\"lab_us-gaap_EquityComponentDomain_label_en-US\" xlink:label=\"lab_us-gaap_EquityComponentDomain\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Component [Domain]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockParOrStatedValuePerShare\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:to=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare_b1e99f9e-22fe-4338-880c-8ad9179aa014_terseLabel_en-US\" xlink:label=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Par or Stated Value Per Share</link:label>\n    <link:label id=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare_label_en-US\" xlink:label=\"lab_us-gaap_PreferredStockParOrStatedValuePerShare\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Par or Stated Value Per Share</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:to=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_0cece0f9-234b-42fa-8187-7f36f270894c_verboseLabel_en-US\" xlink:label=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Accumulated Other Comprehensive Loss [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ebbeb82d-f885-429f-b838-0b0582828cda_terseLabel_en-US\" xlink:label=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">AOCI Attributable to Parent [Member]</link:label>\n    <link:label id=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember_label_en-US\" xlink:label=\"lab_us-gaap_AccumulatedOtherComprehensiveIncomeMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">AOCI Attributable to Parent [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredCompensationShareBasedPaymentsMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:to=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember_80beb46a-4a8d-429b-ac5b-717efccee478_terseLabel_en-US\" xlink:label=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred Compensation [Member]</link:label>\n    <link:label id=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember_label_en-US\" xlink:label=\"lab_us-gaap_DeferredCompensationShareBasedPaymentsMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred Compensation, Share-Based Payments [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_SharesIssued\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesIssued\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_SharesIssued\" xlink:to=\"lab_us-gaap_SharesIssued\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_SharesIssued_656626cb-39f5-4c79-81ff-d9233594bed3_periodStartLabel_en-US\" xlink:label=\"lab_us-gaap_SharesIssued\" xlink:role=\"http://www.xbrl.org/2003/role/periodStartLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Beginning Balances (shares)</link:label>\n    <link:label id=\"lab_us-gaap_SharesIssued_889f6824-3814-4bb1-90b7-cde82d81dd22_periodEndLabel_en-US\" xlink:label=\"lab_us-gaap_SharesIssued\" xlink:role=\"http://www.xbrl.org/2003/role/periodEndLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Ending Balances (shares)</link:label>\n    <link:label id=\"lab_us-gaap_SharesIssued_label_en-US\" xlink:label=\"lab_us-gaap_SharesIssued\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares, Issued</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:to=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_9a021a6b-9c57-40e6-8b53-df16a54877c6_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Share-based compensation and tax benefit</link:label>\n    <link:label id=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_label_en-US\" xlink:label=\"lab_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:href=\"cpk-20230630.xsd#cpk_SharesHeldInTrustForDeferredCompensationPlan\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:to=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_50fb8b11-e5ae-4839-a46c-8042299c4046_terseLabel_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares Held In Trust For Deferred Compensation Plan</link:label>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_968d3e48-bc66-406a-81b4-169f5cee0b02_verboseLabel_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/verboseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred compensation plan held Rabbi Trust (shares)</link:label>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_label_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Shares Held In Trust For Deferred Compensation Plan</link:label>\n    <link:label id=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan_documentation_en-US\" xlink:label=\"lab_cpk_SharesHeldInTrustForDeferredCompensationPlan\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Deferred compensation plan held Rabbi Trust.</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StockholdersEquity\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StockholdersEquity\" xlink:to=\"lab_us-gaap_StockholdersEquity\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_1ddfaf1a-065f-4693-9071-fc4de5f498b9_totalLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/totalLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Total stockholders\u2019 equity</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_49352f39-5749-4a4b-8f3b-10459d48910e_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Stockholders' Equity Attributable to Parent</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_d1ef787d-787a-4a12-a2e5-b5c047d91a5d_periodStartLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/periodStartLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Beginning Balances</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_7e3fc5b5-b1aa-4ebe-8123-9c62d1241691_periodEndLabel_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/periodEndLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Ending Balances</link:label>\n    <link:label id=\"lab_us-gaap_StockholdersEquity_label_en-US\" xlink:label=\"lab_us-gaap_StockholdersEquity\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity, Attributable to Parent</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_PreferredStockSharesAuthorized\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_PreferredStockSharesAuthorized\" xlink:to=\"lab_us-gaap_PreferredStockSharesAuthorized\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_PreferredStockSharesAuthorized_1fb01a7f-49d2-47f9-b268-d2a0fc23954a_terseLabel_en-US\" xlink:label=\"lab_us-gaap_PreferredStockSharesAuthorized\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Shares Authorized</link:label>\n    <link:label id=\"lab_us-gaap_PreferredStockSharesAuthorized_label_en-US\" xlink:label=\"lab_us-gaap_PreferredStockSharesAuthorized\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Preferred Stock, Shares Authorized</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementTable\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StatementTable\" xlink:to=\"lab_us-gaap_StatementTable\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StatementTable_74009309-a022-4761-aa00-921420afb3ee_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StatementTable\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement [Table]</link:label>\n    <link:label id=\"lab_us-gaap_StatementTable_label_en-US\" xlink:label=\"lab_us-gaap_StatementTable\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Statement [Table]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_AwardTypeAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_AwardTypeAxis\" xlink:to=\"lab_us-gaap_AwardTypeAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_AwardTypeAxis_3a5c4290-1b83-4adf-a1ab-276ba9eb45e2_terseLabel_en-US\" xlink:label=\"lab_us-gaap_AwardTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Award Type [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_AwardTypeAxis_label_en-US\" xlink:label=\"lab_us-gaap_AwardTypeAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Award Type [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_StatementEquityComponentsAxis\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_StatementEquityComponentsAxis\" xlink:to=\"lab_us-gaap_StatementEquityComponentsAxis\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_StatementEquityComponentsAxis_4039caf5-111f-49f3-b619-9c4bfafa864e_terseLabel_en-US\" xlink:label=\"lab_us-gaap_StatementEquityComponentsAxis\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Components [Axis]</link:label>\n    <link:label id=\"lab_us-gaap_StatementEquityComponentsAxis_label_en-US\" xlink:label=\"lab_us-gaap_StatementEquityComponentsAxis\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Equity Components [Axis]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:href=\"cpk-20230630.xsd#cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:to=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_f854e437-9761-45a8-9172-d8649d2faa4f_terseLabel_en-US\" xlink:label=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan</link:label>\n    <link:label id=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_label_en-US\" xlink:label=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan</link:label>\n    <link:label id=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan_documentation_en-US\" xlink:label=\"lab_cpk_StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan\" xlink:role=\"http://www.xbrl.org/2003/role/documentation\" xlink:type=\"resource\" xml:lang=\"en-US\">Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_us-gaap_TreasuryStockCommonMember\" xlink:href=\"https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_us-gaap_TreasuryStockCommonMember\" xlink:to=\"lab_us-gaap_TreasuryStockCommonMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_us-gaap_TreasuryStockCommonMember_6a72d8d6-028f-46e7-b498-fb15858f5029_terseLabel_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockCommonMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Common</link:label>\n    <link:label id=\"lab_us-gaap_TreasuryStockCommonMember_label_en-US\" xlink:label=\"lab_us-gaap_TreasuryStockCommonMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Treasury Stock, Common [Member]</link:label>\n    <link:loc xlink:type=\"locator\" xlink:label=\"loc_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:href=\"cpk-20230630.xsd#cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\"/>\n    <link:labelArc xlink:arcrole=\"http://www.xbrl.org/2003/arcrole/concept-label\" xlink:from=\"loc_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:to=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:type=\"arc\" order=\"1\"/>\n    <link:label id=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember_e5e992bc-7608-402d-bb50-59d5585bcc74_terseLabel_en-US\" xlink:label=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:role=\"http://www.xbrl.org/2003/role/terseLabel\" xlink:type=\"resource\" xml:lang=\"en-US\">Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member]</link:label>\n    <link:label id=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember_label_en-US\" xlink:label=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember\" xlink:role=\"http://www.xbrl.org/2003/role/label\" xlink:type=\"resource\" xml:lang=\"en-US\">Accumulated (Gain) Loss from Interest Rate Swap Cash Flows Hedges [Member]</link:label>\n    <link:label id=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesMember_documentation_en-US\" xlink:label=\"lab_cpk_AccumulatedGainLossfromInterestRateSwapCashFl\n\n##Instance document\n<?xml version='1.0' encoding='UTF-8'?>\n<xbrl xmlns=\"http://www.xbrl.org/2003/instance\" xmlns:cpk=\"http://www.chpk.com/20230630\" xmlns:dei=\"http://xbrl.sec.gov/dei/2023\" xmlns:iso4217=\"http://www.xbrl.org/2003/iso4217\" xmlns:link=\"http://www.xbrl.org/2003/linkbase\" xmlns:srt=\"http://fasb.org/srt/2023\" xmlns:us-gaap=\"http://fasb.org/us-gaap/2023\" xmlns:utr=\"http://www.xbrl.org/2009/utr\" xmlns:xbrldi=\"http://xbrl.org/2006/xbrldi\" xmlns:xhtml=\"http://www.w3.org/1999/xhtml\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xml:lang=\"en-US\"><link:schemaRef xlink:href=\"cpk-20230630.xsd\" xlink:type=\"simple\"/>\n\t<context id=\"c-5\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <startDate>2022-04-01</startDate>\n            <endDate>2022-06-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-6\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        </entity>\n        <period>\n            <startDate>2022-01-01</startDate>\n            <endDate>2022-06-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-4\">\n        <entity>\n            <identifier scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n        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scheme=\"http://www.sec.gov/CIK\">0000019745</identifier>\n            <segment>\n                <xbrldi:explicitMember dimension=\"us-gaap:StatementEquityComponentsAxis\">us-gaap:TreasuryStockCommonMember</xbrldi:explicitMember>\n            </segment>\n        </entity>\n        <period>\n            <startDate>2023-01-01</startDate>\n            <endDate>2023-06-30</endDate>\n        </period>\n    </context>\n\t<context id=\"c-394\">\n        <entity>\n            <identifier scheme=\"h\n\n##US GAAP Taxonomy\nNone\n\nQuestion: What erroneous relationship type exists between StatementEquityComponentsAxis and TreasuryStockMember, based on the provided XBRL filing and the US GAAP taxonomy?\nAnswer:\n\n    "

Answer: "CombinationErr"