XML 108 R94.htm IDEA: XBRL DOCUMENT v3.8.0.1

Short-term borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 4,785	$ 12,876
Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	1.70%	2.69%
Pledged
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 215,000	$ 120,000
Pledged | Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	1.46%	0.63%
Pledged | Repurchase advance
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 125,000	$ 100,000
Pledged | Repurchase advance | Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	1.47%	0.63%
Pledged | Fixed rate advances
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 90,000	$ 0
Pledged | Fixed rate advances | Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	1.45%	0.00%
Pledged | Cash management advance
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 0	$ 20,000
Pledged | Cash management advance | Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	0.00%	0.59%

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://www.xbrl.org/2003/role/presentationRef
-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

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_AssetsSoldUnderAgreementsToRepurchaseLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_CollateralPledgedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fmnb_RepurchaseAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fmnb_FixedRateAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fmnb_CashManagementAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: