XML 139 R106.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Short-term borrowings (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of securities sold under agreements to repurchase |  |  |
Average balance during the year | $ 3,343 | $ 51,694 | $ 82,627
Average interest rate during the year | 1.36% | 0.67% | 0.13%
Maximum month-end balance during the year | $ 5,505 | $ 87,163 | $ 94,208
Weighted average year-end interest rate | 1.36% | 0.67% | 0.14%
Balance at year-end | $ 1,700 | $ 4,409 | $ 74,215

X
- Definition Assets sold under agreements to repurchase average during year. + References No definition available. + Details
Name: | fmnb_AssetsSoldUnderAgreementsToRepurchaseAverageDuringYear
Namespace Prefix: | fmnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assets sold under agreements to repurchase average interest rate during year. + References No definition available. + Details
Name: | fmnb_AssetsSoldUnderAgreementsToRepurchaseAverageInterestRateDuringYear
Namespace Prefix: | fmnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Assets sold under agreements to repurchase maximum month end during year. + References No definition available. + Details
Name: | fmnb_AssetsSoldUnderAgreementsToRepurchaseMaximumMonthEndDuringYear
Namespace Prefix: | fmnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assets sold under agreements to repurchase weighted average year end interest rate. + References No definition available. + Details
Name: | fmnb_AssetsSoldUnderAgreementsToRepurchaseWeightedAverageYearEndInterestRate
Namespace Prefix: | fmnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Summary of securities sold under agreements to repurchase. + References No definition available. + Details
Name: | fmnb_SummaryOfSecuritiesSoldUnderAgreementsToRepurchaseAbstract
Namespace Prefix: | fmnb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant