XML 62 R51.htm IDEA: XBRL DOCUMENT
v3.21.2

Loans (Impaired Loans) - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 30, 2021 | Jun. 30, 2021 Loan | May 31, 2020 Loan | Sep. 30, 2021 USD ($) Loan | Sep. 30, 2020 USD ($) Loan | Sep. 30, 2021 USD ($) Contract Loan | Sep. 30, 2020 USD ($) Contract Loan | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Additional funds available to be advanced in connection with impaired loans |  |  |  | $ 0 |  | $ 0 |  |  |
Impaired loans classified as troubled debt restructured |  |  |  | $ 6,000,000.0 | $ 6,400,000 | $ 6,000,000.0 | $ 6,400,000 | $ 6,500,000 |
Number of contracts modified | Loan |  |  |  | 1 | 1 | 2 | 6 |  |
TDR impaired loans paid off | Loan |  | 2 | 1 |  |  |  |  |  |
Term of loan | 5 years |  |  |  |  | 3 years |  |  |
Loan amortization period |  |  |  |  |  | 10 years |  |  |
Allowance for loan losses |  |  |  | $ 15,698,000 |  | $ 15,698,000 |  | 13,672,000 | $ 7,228,000
TDR loans, subsequently defaulted during the period |  |  |  | 0 | 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 |  |  |  |  |  | 90 days |  |  |
Delinquent period for charging down commercial and agricultural credits |  |  |  |  |  | 120 days |  |  |
Foreclosed residential real estate property |  |  |  | $ 167,000 |  | $ 167,000 |  | 71,000 |
Maximum [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Litigation and any deficiency charged off period |  |  |  |  |  | 150 days |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  |  |  | 86,000 | $ 481,000 | $ 86,000 | $ 481,000 |  |
Number of contracts modified | Contract |  |  |  |  |  | 1 | 2 |  |
TDR impaired loans paid off | Loan |  |  |  |  |  | 1 |  |  |
Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Impaired loans classified as troubled debt restructured |  |  |  | 480,000 |  | $ 480,000 |  |  |
TDR impaired loans paid off | Loan |  |  |  |  |  | 1 |  |  |
Allowance for loan losses |  |  |  | 0 |  | $ 0 |  |  |
TDR impaired loans charged off | Loan |  |  |  |  |  | 3 |  |  |
TDR impaired loans charged off amount |  |  |  |  |  | $ 809,000 |  |  |
Consumer Real Estate [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Foreclosed residential real estate property |  |  |  | 167,000 | 71,000 | 167,000 | $ 71,000 | 71,000 |
Residential real estate properties foreclosure proceedings |  |  |  | 129,000 | $ 849,000 | $ 129,000 | $ 849,000 | $ 910,000 |
Principal Forgiveness [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Number of contracts modified | Contract |  |  |  |  |  | 0 |  |  |
Specific Allocation on Principal Balance [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  | $ 1,000,000.0 |  | $ 1,000,000.0 |  |  |

X
- Definition Additional funds available to be advanced in connection with impaired loans. + References No definition available. + Details
Name: | fmao_AdditionalFundsAvailableToBeAdvancedInConnectionWithImpairedLoans
Namespace Prefix: | fmao_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Financing receivables impaired number of troubled debt restructuring charged off. + References No definition available. + Details
Name: | fmao_FinancingReceivablesImpairedNumberOfTroubledDebtRestructuringChargedOff
Namespace Prefix: | fmao_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing receivables impaired number of troubled debt restructuring write down. + References No definition available. + Details
Name: | fmao_FinancingReceivablesImpairedNumberOfTroubledDebtRestructuringWriteDown
Namespace Prefix: | fmao_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Litigation and any deficiency charged off period. + References No definition available. + Details
Name: | fmao_LitigationAndAnyDeficiencyChargedOffPeriod
Namespace Prefix: | fmao_
Data Type: | xbrli:durationItemType
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 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
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL49126937-111524 + Details
Name: | us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522 + Details
Name: | us-gaap_RealEstateAcquiredThroughForeclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PrincipalForgivenessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=fmao_SpecificAllocationOnPrincipalBalanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |