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STOCK-BASED COMPENSATION AND STOCK REPURCHASE PROGRAM (Narrative) (Details) (USD $) | 6 Months Ended | 89 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015
Stock option expenses | $ 0us-gaap_StockOptionPlanExpense | $ 0us-gaap_StockOptionPlanExpense |
Stock award expenses | 9,000us-gaap_RestrictedStockExpense | 9,000us-gaap_RestrictedStockExpense |
Cost of shares repurchased by ESOP trust | 2,300,000mgyr_EmployeeStockOwnershipPlanESOPValueInESOP |  |
Average cost of shares repurchased (per share) | $ 10.58us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased |  |
Description of loan with respect to employee stock ownership plan | The ESOP trust purchased 217,863 shares of common stock in the open market using proceeds of a loan from the Company. The total cost of shares purchased by the ESOP trust was $2.3 million, reflecting an average cost per share of $10.58. The Bank will make cash contributions to the ESOP on an annual basis sufficient to enable the ESOP to make the required loan payments to the Company. The loan bears a variable interest rate that adjusts annually every January 1st to the then published Prime Rate (3.25% at January 1, 2015) with principal and interest payable annually in equal installments over thirty years. The loan is secured by shares of the Company's stock. |  |
Interest rate of loan with respect to employee stock ownership plan | 3.25%mgyr_InterestRateOfLoanWithRespectToEmployeeStockOwnershipPlan |  | 3.25%mgyr_InterestRateOfLoanWithRespectToEmployeeStockOwnershipPlan
Shares allocated | 128,436us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares |  | 128,436us-gaap_EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares
Suspense shares | 89,426us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares |  | 89,426us-gaap_EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares
Fair value of unallocated shares | 752,967us-gaap_EmployeeStockOwnershipPlanESOPDeferredSharesFairValue |  | 752,967us-gaap_EmployeeStockOwnershipPlanESOPDeferredSharesFairValue
ESOP compensation expense | $ 53,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 48,000us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense |
Total ESOP shares | 217,863us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP |  | 217,863us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Stock Options [Member] |  |  |
Vesting period | 5 years |  |
Expiration period | 10 years |  |
Term of treasury security | 7 years |  |
Restricted shares [Member] |  |  |
Vesting period | 5 years |  |
Second Repurchase Program |  |  |
Maximum stock repurchase authorization (as a percent) |  |  | 5.00%mgyr_MaximumPercentageStockRepurchaseAuthorisation / us-gaap_ShareRepurchaseProgramAxis = mgyr_ShareRepurchaseSecondProgramMember
Stock authorized to be repurchased (in shares) | 129,924us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = mgyr_ShareRepurchaseSecondProgramMember |  | 129,924us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = mgyr_ShareRepurchaseSecondProgramMember
Stock repurchased during period (in shares) |  |  | 81,000us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = mgyr_ShareRepurchaseSecondProgramMember
Remaining shares available to be repurchased | 48,924us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = mgyr_ShareRepurchaseSecondProgramMember |  | 48,924us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased / us-gaap_ShareRepurchaseProgramAxis = mgyr_ShareRepurchaseSecondProgramMember
Common stock average cost (in dollars per share) |  |  | $ 8.33us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = mgyr_ShareRepurchaseSecondProgramMember

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- Definition Description of the terms of a loan made to the ESOP by a lender other than the employer, including interest rate and repayment requirements, and description of any guarantee of debt repayment made by the employer to the lender. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Direct Loan -URI http://asc.fasb.org/extlink&oid=6510849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16545-113920 + Details
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- Definition The fair value of shares held by the ESOP as of the balance sheet date in which no ESOP participant has a vested interest and no lender has a claim. The fair value of an ESOP share is the amount the seller could reasonably expect to receive for it in a current sale between a willing buyer and a willing seller, that is, other than in a forced or liquidation sale, which would be the market price of the stock if it is publicly traded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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