XML 120 R104.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Long-Term Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Summary of long-term advances from the Federal Home Loan Bank |  |
Amount of Advances | $ 3,775 | $ 4,785
Weighted Average |  |
Summary of long-term advances from the Federal Home Loan Bank |  |
Weighted Average Interest Rate | 1.70% | 1.70%
Fixed-rate constant payment advances |  |
Summary of long-term advances from the Federal Home Loan Bank |  |
Amount of Advances | $ 3,775 | $ 4,785
Fixed-rate constant payment advances | Weighted Average |  |
Summary of long-term advances from the Federal Home Loan Bank |  |
Weighted Average Interest Rate | 1.70% | 1.70%

X
- Definition Federal home loan bank advances branch of FHLB. + References No definition available. + Details
Name: | fmnb_FederalHomeLoanBankAdvancesBranchOfFHLBAbstract
Namespace Prefix: | fmnb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fmnb_FixedRateConstantPaymentAdvancesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |