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Loans - Analysis of Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | $ 5,357 us-gaap_FinancingReceivableAllowanceForCreditLosses | $ 5,386 us-gaap_FinancingReceivableAllowanceForCreditLosses |
Charge Offs | (778)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | (1,262)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | (891)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries | 298 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | 374 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | 286 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Provision | 1,191 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries | 858 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries |
Other Non-interest expense related to unfunded | 44 fmb_OtherNonInterestExpenseRecoveryRelatedToUnfunded | 1 fmb_OtherNonInterestExpenseRecoveryRelatedToUnfunded |
Ending Balance | 6,112 us-gaap_FinancingReceivableAllowanceForCreditLosses | 5,357 us-gaap_FinancingReceivableAllowanceForCreditLosses | 5,386 us-gaap_FinancingReceivableAllowanceForCreditLosses
Ending balance: individually evaluated for impairment | 387 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 | 516 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 |
Ending balance: collectively evaluated for impairment | 5,725 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment | 4,841 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment |
Ending balance: loans acquired with deteriorated credit quality | 2 fmb_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod | 1 fmb_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod |
FINANCING RECEIVABLES: |  |  |
Ending balance, net of deferred fees | 621,926 fmb_FinancingReceivablesCurrentAndPastDue | 576,113 fmb_FinancingReceivablesCurrentAndPastDue |
Ending balance: individually evaluated for impairment | 1,843 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | 2,440 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment |
Ending balance: collectively evaluated for impairment | 620,083 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 573,673 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment |
Ending balance: loans acquired with deteriorated credit quality | 526 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality | 540 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality |
Consumer Real Estate [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 257 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 368 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Charge Offs | (168)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | (147)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Recoveries | 34 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 20 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Provision | 414 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 16 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Ending Balance | 537 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 257 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Ending balance: individually evaluated for impairment | 36 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 78 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Ending balance: collectively evaluated for impairment | 501 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 179 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Ending balance: loans acquired with deteriorated credit quality | 2 fmb_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 1 fmb_FinancingReceivableAllowanceForCreditLossesAcquiredWithDeterioratedCreditQualityEndingPeriod / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
FINANCING RECEIVABLES: |  |  |
Ending balance, net of deferred fees | 97,550 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 92,438 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Ending balance: individually evaluated for impairment | 301 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 300 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Ending balance: collectively evaluated for impairment | 97,249 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 92,138 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Ending balance: loans acquired with deteriorated credit quality | 526 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember | 540 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / us-gaap_FinancialInstrumentAxis = fmb_ConsumerRealEstateMember |
Agricultural Real Estate [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 131 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 113 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Provision | 53 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 18 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Ending Balance | 184 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 131 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Ending balance: individually evaluated for impairment |  | 9 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Ending balance: collectively evaluated for impairment | 184 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 122 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
FINANCING RECEIVABLES: |  |  |
Ending balance, net of deferred fees | 50,895 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 44,301 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Ending balance: individually evaluated for impairment |  | 88 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Ending balance: collectively evaluated for impairment | 50,895 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember | 44,213 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgricultureRealEstateMember |
Agricultural [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 326 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 290 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Recoveries | 44 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 5 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Provision | 177 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 31 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Ending Balance | 547 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 326 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Ending balance: individually evaluated for impairment | 25 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |  |
Ending balance: collectively evaluated for impairment | 522 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 326 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
FINANCING RECEIVABLES: |  |  |
Ending balance, net of deferred fees | 74,611 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 65,449 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Ending balance: individually evaluated for impairment | 25 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |  |
Ending balance: collectively evaluated for impairment | 74,586 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember | 65,449 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_AgriculturalLoanMember |
Commercial Real Estate [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 2,107 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,749 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Charge Offs | (229)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | (164)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Recoveries | 4 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 23 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Provision | 485 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 499 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Ending Balance | 2,367 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 2,107 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Ending balance: individually evaluated for impairment | 111 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 295 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Ending balance: collectively evaluated for impairment | 2,256 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,812 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
FINANCING RECEIVABLES: |  |  |
Ending balance, net of deferred fees | 270,188 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 248,893 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Ending balance: individually evaluated for impairment | 1,179 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,675 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Ending balance: collectively evaluated for impairment | 269,009 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 247,218 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Commercial and Industrial [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 1,359 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 2,183 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Charge Offs |  | (513)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Recoveries | 20 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 141 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Provision | 42 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | (452)fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Ending Balance | 1,421 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 1,359 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Ending balance: individually evaluated for impairment | 204 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 134 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Ending balance: collectively evaluated for impairment | 1,217 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 1,225 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
FINANCING RECEIVABLES: |  |  |
Ending balance, net of deferred fees | 104,824 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 103,856 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Ending balance: individually evaluated for impairment | 327 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 377 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Ending balance: collectively evaluated for impairment | 104,497 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember | 103,479 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_CommercialAndIndustrialMember |
Consumer [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 292 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 268 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Charge Offs | (381)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | (438)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Recoveries | 196 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 185 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Provision | 216 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 277 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Ending Balance | 323 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 292 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Ending balance: individually evaluated for impairment | 11 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Ending balance: collectively evaluated for impairment | 312 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 292 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
FINANCING RECEIVABLES: |  |  |
Ending balance, net of deferred fees | 23,858 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 21,176 fmb_FinancingReceivablesCurrentAndPastDue / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Ending balance: individually evaluated for impairment | 11 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |  |
Ending balance: collectively evaluated for impairment | 23,847 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 21,176 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 163 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember | 162 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember |
Other Non-interest expense related to unfunded | 44 fmb_OtherNonInterestExpenseRecoveryRelatedToUnfunded / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember | 1 fmb_OtherNonInterestExpenseRecoveryRelatedToUnfunded / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember |
Ending Balance | 207 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember | 163 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember |
Ending balance: collectively evaluated for impairment | 207 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember | 163 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_UnfundedLoanCommitmentAndLettersOfCreditMember |
Unallocated [Member] |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |
Beginning balance | 722 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnallocatedMember | 253 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnallocatedMember |
Provision | (196)fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_UnallocatedMember | 469 fmb_ProvisionForLoanAndLeaseLossesAndRecoveries / us-gaap_FinancialInstrumentAxis = fmb_UnallocatedMember |
Ending Balance | 526 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnallocatedMember | 722 us-gaap_FinancingReceivableAllowanceForCreditLosses / us-gaap_FinancialInstrumentAxis = fmb_UnallocatedMember |
Ending balance: collectively evaluated for impairment | $ 526 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_UnallocatedMember | $ 722 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = fmb_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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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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