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Loans - Analysis of Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | $ 6,112 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 5,357 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 5,357 us-gaap_FinancingReceivableAllowanceForCreditLosses |
Charge Offs | (92)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | (366)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | (778)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs |
Recoveries | 50 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | 69 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | 298 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts |
Provision (Credit) | 114 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries | 428 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries |  |
Other Non-interest expense related to unfunded | (5)fmao_OtherNonInterestExpenseRecoveryRelatedToUnfunded | 17 fmao_OtherNonInterestExpenseRecoveryRelatedToUnfunded |  |
Ending Balance | 6,179 us-gaap_FinancingReceivableAllowanceForCreditLosses | 5,505 us-gaap_FinancingReceivableAllowanceForCreditLosses | 6,112 us-gaap_FinancingReceivableAllowanceForCreditLosses |
Ending balance: individually evaluated for impairment | 428 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 | 261 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 |  |
Ending balance: collectively evaluated for impairment | 5,751 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment | 5,244 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment |  |
Ending balance: loans acquired with deteriorated credit quality | 1 fmao_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod | 2 fmao_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod |  |
FINANCING RECEIVABLES: |  |  |  |
Ending balance | 614,709 fmao_FinancingReceivablesCurrentAndPastDue | 582,872 fmao_FinancingReceivablesCurrentAndPastDue | 621,926 fmao_FinancingReceivablesCurrentAndPastDue |
Ending balance: individually evaluated for impairment | 2,243 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | 2,059 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment |  |
Ending balance: collectively evaluated for impairment | 612,466 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 580,813 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment |  |
Ending balance: loans acquired with deteriorated credit quality | 520 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality | 536 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality |  |
Consumer Real Estate [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 537 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 257 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 257 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Charge Offs |  | (64)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Recoveries | 2 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 10 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Provision (Credit) | (42)fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 199 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Ending Balance | 497 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 402 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Ending balance: individually evaluated for impairment | 35 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 44 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Ending balance: collectively evaluated for impairment | 462 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 358 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Ending balance: loans acquired with deteriorated credit quality | 1 fmao_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 2 fmao_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
FINANCING RECEIVABLES: |  |  |  |
Ending balance | 97,019 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 91,368 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 97,550 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |
Ending balance: individually evaluated for impairment | 253 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 181 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Ending balance: collectively evaluated for impairment | 96,766 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 91,187 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Ending balance: loans acquired with deteriorated credit quality | 520 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember | 536 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / us-gaap_FinancialInstrumentAxis = fmao_ConsumerRealEstateMember |  |
Agricultural Real Estate [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 184 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |  | 131 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Provision (Credit) | 3 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |  |
Ending Balance | 187 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 131 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  | 131 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember
Ending balance: collectively evaluated for impairment | 187 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 131 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |
FINANCING RECEIVABLES: |  |  |  |
Ending balance | 51,396 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 49,629 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 50,895 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |
Ending balance: individually evaluated for impairment |  | 141 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |
Ending balance: collectively evaluated for impairment | 51,396 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember | 49,488 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgricultureRealEstateMember |  |
Agricultural [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 547 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 326 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 326 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |
Recoveries | 1 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 1 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |
Provision (Credit) | (24)fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | (3)fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |
Ending Balance | 524 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 324 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |
Ending balance: individually evaluated for impairment | 24 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |  |
Ending balance: collectively evaluated for impairment | 500 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 324 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |
FINANCING RECEIVABLES: |  |  |  |
Ending balance | 71,571 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 64,859 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 74,611 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |
Ending balance: individually evaluated for impairment | 24 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |  |
Ending balance: collectively evaluated for impairment | 71,547 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember | 64,859 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_AgriculturalLoanMember |  |
Commercial Real Estate [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 2,367 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 2,107 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 2,107 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Charge Offs |  | (201)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Recoveries | 1 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 2 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Provision (Credit) | (156)fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 50 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Ending Balance | 2,212 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,958 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Ending balance: individually evaluated for impairment | 131 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 107 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Ending balance: collectively evaluated for impairment | 2,081 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,851 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
FINANCING RECEIVABLES: |  |  |  |
Ending balance | 271,201 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 261,634 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 270,188 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Ending balance: individually evaluated for impairment | 1,139 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,385 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Ending balance: collectively evaluated for impairment | 270,062 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 260,249 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |  |
Commercial and Industrial [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 1,421 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 1,359 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 1,359 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Recoveries | 5 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 5 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
Provision (Credit) | (7)fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | (34)fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
Ending Balance | 1,419 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 1,330 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
Ending balance: individually evaluated for impairment | 238 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 110 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
Ending balance: collectively evaluated for impairment | 1,181 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 1,220 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
FINANCING RECEIVABLES: |  |  |  |
Ending balance | 99,895 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 94,358 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 104,824 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |
Ending balance: individually evaluated for impairment | 827 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 352 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
Ending balance: collectively evaluated for impairment | 99,068 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember | 94,006 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_CommercialAndIndustrialMember |  |
Consumer [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 323 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 292 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 292 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Charge Offs | (92)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | (101)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Recoveries | 41 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 51 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Provision (Credit) | 12 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 28 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Ending Balance | 284 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 270 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Ending balance: collectively evaluated for impairment | 284 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 270 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
FINANCING RECEIVABLES: |  |  |  |
Ending balance | 23,627 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 21,024 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 23,858 fmao_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Ending balance: collectively evaluated for impairment | 23,627 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 21,024 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 207 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember | 163 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember | 163 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember |
Other Non-interest expense related to unfunded | (5)fmao_OtherNonInterestExpenseRecoveryRelatedToUnfunded / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember | 17 fmao_OtherNonInterestExpenseRecoveryRelatedToUnfunded / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember |  |
Ending Balance | 202 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember | 180 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember |  |
Ending balance: collectively evaluated for impairment | 202 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember | 180 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_UnfundedLoanCommitmentAndLettersOfCreditMember |  |
Unallocated [Member] |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |
Beginning balance | 526 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember | 722 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember | 722 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember |
Provision (Credit) | 328 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember | 188 fmao_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember |  |
Ending Balance | 854 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember | 910 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember |  |
Ending balance: collectively evaluated for impairment | $ 854 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember | $ 910 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmao_UnallocatedMember |  |

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: 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(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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