XML 34 R24.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Loans - Additional Information (Detail) (USD $) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for sale |  | $ 556,000 |
Residential mortgage loan | 22,000,000 | 24,200,000 |
Impaired loans classified as troubled debt restructured | 824,400 | 861,200 | 378,000
Troubled debt restructuring | 0 |  | 0
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 |  |
Consumer Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans held for sale | $ 678,000 |  |
Maximum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Leverage position of balance sheet | 1.50 |  |
Leverage position of customers | 2.00 |  |
Minimum [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Repayment period of loan with a reasonable reduction of principal balance | 2 years |  |

X
- Definition Delinquent period for charging down commercial and agricultural credits. + References No definition available. + Details
Name: | fmao_DelinquentPeriodForChargingDownCommercialAndAgriculturalCredits
Namespace Prefix: | fmao_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Delinquent period for charging down consumer loans + References No definition available. + Details
Name: | fmao_DelinquentPeriodForChargingDownConsumerLoans
Namespace Prefix: | fmao_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Impaired loans classified as troubled debt restructured. + References No definition available. + Details
Name: | fmao_ImpairedLoansClassifiedAsTroubledDebtRestructured
Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Leverage position of balance sheet. + References No definition available. + Details
Name: | fmao_LeveragePositionOfBalanceSheet
Namespace Prefix: | fmao_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Leverage ratio. + References No definition available. + Details
Name: | fmao_LeverageRatio
Namespace Prefix: | fmao_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum time for reevaluation. + References No definition available. + Details
Name: | fmao_MaximumTimeForReevaluation
Namespace Prefix: | fmao_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Re evaluation period for real estate. + References No definition available. + Details
Name: | fmao_ReEvaluationPeriodForRealEstate
Namespace Prefix: | fmao_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Repayment period of loan with reasonable reduction of principal balance. + References No definition available. + Details
Name: | fmao_RepaymentPeriodOfLoanWithReasonableReductionOfPrincipalBalance
Namespace Prefix: | fmao_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Residential mortgage loan. + References No definition available. + Details
Name: | fmao_ResidentialMortgageLoan
Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unsecured consumer loans credit card credits and overdraft. + References No definition available. + Details
Name: | fmao_UnsecuredConsumerLoansCreditCardCreditsAndOverdraft
Namespace Prefix: | fmao_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LoansReceivableHeldForSaleNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_TroubledDebtRestructuringDebtorSubsequentPeriodsContingentPaymentsAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant