XML 94 R92.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011
Fair Value Measurements [Abstract] |  |
Percentage of securities using market-based information | 97.00% |
Percentage of securities using model-based techniques | 3.00% |
Change in unrealized gains or losses included in earnings relating to assets still held |  | $ 37
Impaired loans, carrying amount | 9,386 |
Allocated allowance for loan losses | 3,688 |
Fair value of allocated allowance | 6,459 |
Estimated costs to sell | 760 |
Provision for fair value measurements included in allowance for loan losses | 3,688 |
Carrying amount of OREO | 3,636 |
Write down of OREO | 2,014 |
Fair value of OREO | 2,306 |
Estimated cost to sell OREO | 292 |
Loss from OREO included in earnings | 1,622 |
Minimum corporation reserves for commercial loan | $ 500 |

X
- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Gain Loss Included In Earnings Relating To Assets Still Held. + References No definition available. + Details
Name: | fnb_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsRelatingToAssetsStillHeld
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of OREO. + References No definition available. + Details
Name: | fnb_FairValueOfOtherRealEstateOwned
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loss from OREO included in earnings. + References No definition available. + Details
Name: | fnb_GainsLossesIncludedInEarningOnNonRecurringAssetsWriteDown
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Impaired loans. + References No definition available. + Details
Name: | fnb_ImpairedLoans
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Impaired Loans Cost To Sell + References No definition available. + Details
Name: | fnb_ImpairedLoansCostToSell
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum corporation reserves for commercial loan. + References No definition available. + Details
Name: | fnb_MinimumCorporationReservesForCommercialLoan
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other Real Estate Fair Value Disclosure + References No definition available. + Details
Name: | fnb_OtherRealEstateFairValueDisclosure
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated cost to sell OREO. + References No definition available. + Details
Name: | fnb_OtherRealEstateOwnedCostToSell
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other real estate owned written down value. + References No definition available. + Details
Name: | fnb_OtherRealEstateOwnedWrittenDownValue
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of securities using market based information. + References No definition available. + Details
Name: | fnb_PercentageOfSecuritiesUsingMarketBasedInformation
Namespace Prefix: | fnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of securities using model based techniques. + References No definition available. + Details
Name: | fnb_PercentageOfSecuritiesUsingModelBasedTechniques
Namespace Prefix: | fnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Provision For Loan And Lease Losses Fair Value Disclosure + References No definition available. + Details
Name: | fnb_ProvisionForLoanAndLeaseLossesFairValueDisclosure
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The recorded investment related to impaired financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953550-111524 -Subparagraph (b) + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5212-111524 -Subparagraph (a)(3) + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant