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v2.4.1.9

Loans - Additional Information (Detail) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Residential mortgage loan | $ 20,100,000 fmao_ResidentialMortgageLoan | $ 20,800,000 fmao_ResidentialMortgageLoan |
Impaired loans classified as troubled debt restructured | 1,300,000 fmao_ImpairedLoansClassifiedAsTroubledDebtRestructured | 797,200 fmao_ImpairedLoansClassifiedAsTroubledDebtRestructured | 974,000 fmao_ImpairedLoansClassifiedAsTroubledDebtRestructured
Troubled debt restructuring | 0 us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsContingentPaymentsAmount |  | 0 us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsContingentPaymentsAmount
Maximum time for re-evaluation (in months) | 12 months |  |
Re-evaluation period for real estate | 2 years |  |
Unsecured consumer loans, credit card credits and overdraft lines of credit reach | 90 days |  |
Delinquent period for charging down consumer loans | 120 days |  |
Delinquent period for charging down commercial and agricultural credits | 120 days |  |
Foreclosed residential real estate property | 1,098,000 us-gaap_RealEstateAcquiredThroughForeclosure | 1,094,000 us-gaap_RealEstateAcquiredThroughForeclosure |
Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Repayment period of loan with a reasonable reduction of principal balance | 2 years |  |
Other Real Estate Owned - Residential [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Foreclosed residential real estate property | 452,000 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember |  |
Residential real estate properties foreclosure proceedings | 465,000 fmao_MortgageLoanInProcessOfForeclosureAmount / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember |  |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for sale | $ 457,000 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | $ 459,000 us-gaap_LoansReceivableHeldForSaleNet / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Good [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Leverage position | 150.00%fmao_LeverageRatioTwo / us-gaap_InternalCreditAssessmentAxis = fmao_GoodMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
3 [Member] | Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Leverage position | 200.00%fmao_LeverageRatioTwo / us-gaap_InternalCreditAssessmentAxis = fmao_SatisfactoryMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Delinquent period for charging down commercial and agricultural credits. + References No definition available. + Details
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- Definition Delinquent period for charging down consumer loans + References No definition available. + Details
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- Definition Impaired loans classified as troubled debt restructured. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Leverage ratio. + References No definition available. + Details
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- Definition Maximum time for reevaluation. + References No definition available. + Details
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- Definition Mortgage loan in process of foreclosure amount. + References No definition available. + Details
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Balance Type: | debit
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- Definition Re evaluation period for real estate. + References No definition available. + Details
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- Definition Repayment period of loan with reasonable reduction of principal balance. + References No definition available. + Details
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- Definition Residential mortgage loan. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Unsecured consumer loans credit card credits and overdraft. + References No definition available. + Details
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- Details
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- Definition Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 35 -Paragraph 49 -URI http://asc.fasb.org/extlink&oid=35742846&loc=d3e3084-111518 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490209&loc=d3e48214-111002 + Details
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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Period Type: | instant

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- Definition Amount of restructured debt contingently payable based on the occurrence of future events or circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6402221&loc=d3e15765-112638 + Details
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- Details
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- Details
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- Details
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- Details
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