2.4.1.9 Html 198 232 1 false 55 0 false 5 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.coastway.com/role/DocumentDocumentAndEntityInformation Document and Entity Information true false R2.htm 00100 - Statement - Consolidated Balance Sheets Sheet http://www.coastway.com/role/StatementConsolidatedBalanceSheets Consolidated Balance Sheets false false R3.htm 00105 - Statement - Consolidated Balance Sheets (Parenthetical) Sheet http://www.coastway.com/role/StatementConsolidatedBalanceSheetsParenthetical Consolidated Balance Sheets (Parenthetical) false false R4.htm 00200 - Statement - Consolidated Statements of Net Income (Loss) and Comprehensive Income (Loss) Sheet http://www.coastway.com/role/StatementConsolidatedStatementsOfNetIncomeLossAndComprehensiveIncomeLoss Consolidated Statements of Net Income (Loss) and Comprehensive Income (Loss) false false R5.htm 00300 - Statement - Consolidated Statements of Changes in Stockholders' Equity Sheet http://www.coastway.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquity Consolidated Statements of Changes in Stockholders' Equity false false R6.htm 00305 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) Sheet http://www.coastway.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquityParenthetical Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) false false R7.htm 00400 - Statement - Consolidated Statements of Cash Flows Sheet http://www.coastway.com/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R8.htm 10101 - Disclosure - Basis of Presentation and Consolidation Sheet http://www.coastway.com/role/DisclosureBasisOfPresentationAndConsolidation Basis of Presentation and Consolidation false false R9.htm 10201 - Disclosure - Certificates of Deposit Sheet http://www.coastway.com/role/DisclosureCertificatesOfDeposit Certificates of Deposit false false R10.htm 10301 - Disclosure - Loans Sheet http://www.coastway.com/role/DisclosureLoans Loans false false R11.htm 10401 - Disclosure - Employee Benefits Sheet http://www.coastway.com/role/DisclosureEmployeeBenefits Employee Benefits false false R12.htm 10501 - Disclosure - Earnings per Common Share Sheet http://www.coastway.com/role/DisclosureEarningsPerCommonShare Earnings per Common Share false false R13.htm 10601 - Disclosure - Off-Balance Sheets Activities and Derivatives Sheet http://www.coastway.com/role/DisclosureOffBalanceSheetsActivitiesAndDerivatives Off-Balance Sheets Activities and Derivatives false false R14.htm 10701 - Disclosure - Fair Value Measurements Sheet http://www.coastway.com/role/DisclosureFairValueMeasurements Fair Value Measurements false false R15.htm 20102 - Disclosure - Basis of Presentation and Consolidation (Policies) Sheet http://www.coastway.com/role/DisclosureBasisOfPresentationAndConsolidationPolicies Basis of Presentation and Consolidation (Policies) false false R16.htm 30303 - Disclosure - Loans (Tables) Sheet http://www.coastway.com/role/DisclosureLoansTables Loans (Tables) false false R17.htm 30403 - Disclosure - Employee Benefits (Tables) Sheet http://www.coastway.com/role/DisclosureEmployeeBenefitsTables Employee Benefits (Tables) false false R18.htm 30503 - Disclosure - Earnings per Common Share (Tables) Sheet http://www.coastway.com/role/DisclosureEarningsPerCommonShareTables Earnings per Common Share (Tables) false false R19.htm 30603 - Disclosure - Off-Balance Sheets Activities and Derivatives (Tables) Sheet http://www.coastway.com/role/DisclosureOffBalanceSheetsActivitiesAndDerivativesTables Off-Balance Sheets Activities and Derivatives (Tables) false false R20.htm 30703 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.coastway.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) false false R21.htm 40101 - Disclosure - Basis of Presentation and Consolidation (Details) Sheet http://www.coastway.com/role/DisclosureBasisOfPresentationAndConsolidationDetails Basis of Presentation and Consolidation (Details) false false R22.htm 40201 - Disclosure - Certificates of Deposit (Details) Sheet http://www.coastway.com/role/DisclosureCertificatesOfDepositDetails Certificates of Deposit (Details) false false R23.htm 40301 - Disclosure - Loans (Details) Sheet http://www.coastway.com/role/DisclosureLoansDetails Loans (Details) false false R24.htm 40302 - Disclosure - Loans (Detail 2) Sheet http://www.coastway.com/role/DisclosureLoansDetail2 Loans (Detail 2) false false R25.htm 40303 - Disclosure - Loans (Details 3) Sheet http://www.coastway.com/role/DisclosureLoansDetails3 Loans (Details 3) false false R26.htm 40304 - Disclosure - Loans (Details 4) Sheet http://www.coastway.com/role/DisclosureLoansDetails4 Loans (Details 4) false false R27.htm 40305 - Disclosure - Loans (Details 5) Sheet http://www.coastway.com/role/DisclosureLoansDetails5 Loans (Details 5) false false R28.htm 40306 - Disclosure - Loans (Details 6) Sheet http://www.coastway.com/role/DisclosureLoansDetails6 Loans (Details 6) false false R29.htm 40401 - Disclosure - Employee Benefits (Details) Sheet http://www.coastway.com/role/DisclosureEmployeeBenefitsDetails Employee Benefits (Details) false false R30.htm 40501 - Disclosure - Earnings per Common Share (Details) Sheet http://www.coastway.com/role/DisclosureEarningsPerCommonShareDetails Earnings per Common Share (Details) false false R31.htm 40601 - Disclosure - Off-Balance Sheets Activities and Derivatives (Details) Sheet http://www.coastway.com/role/DisclosureOffBalanceSheetsActivitiesAndDerivativesDetails Off-Balance Sheets Activities and Derivatives (Details) false false R32.htm 40602 - Disclosure - Off-Balance Sheets Activities and Derivatives (Details 2) Sheet http://www.coastway.com/role/DisclosureOffBalanceSheetsActivitiesAndDerivativesDetails2 Off-Balance Sheets Activities and Derivatives (Details 2) false false R33.htm 40603 - Disclosure - Off-Balance Sheets Activities and Derivatives (Details 3) Sheet http://www.coastway.com/role/DisclosureOffBalanceSheetsActivitiesAndDerivativesDetails3 Off-Balance Sheets Activities and Derivatives (Details 3) false false R34.htm 40701 - Disclosure - Fair Value Measurements (Details) Sheet http://www.coastway.com/role/DisclosureFairValueMeasurementsDetails Fair Value Measurements (Details) false false R35.htm 40702 - Disclosure - Fair Value Measurements (Details 2) Sheet http://www.coastway.com/role/DisclosureFairValueMeasurementsDetails2 Fair Value Measurements (Details 2) false false R36.htm 40703 - Disclosure - Fair Value Measurements (Details 3) Sheet http://www.coastway.com/role/DisclosureFairValueMeasurementsDetails3 Fair Value Measurements (Details 3) false false R37.htm 40704 - Disclosure - Fair Value Measurements (Details 4) Sheet http://www.coastway.com/role/DisclosureFairValueMeasurementsDetails4 Fair Value Measurements (Details 4) false false All Reports Book All Reports Element us-gaap_InterestReceivable had a mix of decimals attribute values: -5 -3. Element us-gaap_LoansHeldForSaleFairValueDisclosure had a mix of decimals attribute values: -5 -3. Columns in Cash Flows statement 'Consolidated Statements of Cash Flows (USD $)' have maximum duration 89 days and at least 35 values. Shorter duration columns must have at least one fourth (8) as many values. Column '9/30/2013' is shorter (-735140 days) and has only 2 values, so it is being removed. 'Monetary' elements on report '40101 - Disclosure - Basis of Presentation and Consolidation (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40301 - Disclosure - Loans (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40304 - Disclosure - Loans (Details 4)' had a mix of different decimal attribute values. 'Monetary' elements on report '40305 - Disclosure - Loans (Details 5)' had a mix of different decimal attribute values. 'Monetary' elements on report '40401 - Disclosure - Employee Benefits (Details)' had a mix of different decimal attribute values. 'Monetary' elements on report '40602 - Disclosure - Off-Balance Sheets Activities and Derivatives (Details 2)' had a mix of different decimal attribute values. 'Monetary' elements on report '40704 - Disclosure - Fair Value Measurements (Details 4)' had a mix of different decimal attribute values. Process Flow-Through: 00100 - Statement - Consolidated Balance Sheets Process Flow-Through: Removing column 'Apr. 30, 2015' Process Flow-Through: Removing column 'Dec. 31, 2013' Process Flow-Through: Removing column 'Sep. 30, 2013' Process Flow-Through: 00105 - Statement - Consolidated Balance Sheets (Parenthetical) Process Flow-Through: Removing column 'Mar. 31, 2014' Process Flow-Through: Removing column 'Dec. 31, 2013' Process Flow-Through: 00200 - Statement - Consolidated Statements of Net Income (Loss) and Comprehensive Income (Loss) Process Flow-Through: Removing column '0 Months Ended Jan. 14, 2014' Process Flow-Through: 00305 - Statement - Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) Process Flow-Through: 00400 - Statement - Consolidated Statements of Cash Flows cway-20150331.xml cway-20150331.xsd cway-20150331_cal.xml cway-20150331_def.xml cway-20150331_lab.xml cway-20150331_pre.xml true true