XML 100 R49.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Securities (Schedule Of Amortized Cost And Fair Value Of Securities Held To Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,178,558 | $ 917,212
Gross Unrealized Gains | 36,420 | 36,700
Gross Unrealized Losses | (2,152) | (1,879)
Securities Held To Maturity, Fair Value | 1,212,826 | 952,033
U.S. Treasury And Other U.S. Government Agencies And Corporations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 4,441 | 4,523
Gross Unrealized Gains | 340 | 360
Securities Held To Maturity, Fair Value | 4,781 | 4,883
Agency Mortgage-Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 888,484 | 683,100
Gross Unrealized Gains | 29,006 | 28,722
Gross Unrealized Losses | (471) |
Securities Held To Maturity, Fair Value | 917,019 | 711,822
Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 115,104 | 54,319
Gross Unrealized Gains | 731 | 573
Gross Unrealized Losses | (88) | (11)
Securities Held To Maturity, Fair Value | 115,747 | 54,881
Non-Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 19,652 | 24,348
Gross Unrealized Gains | 107 | 143
Gross Unrealized Losses | (1,313) | (1,373)
Securities Held To Maturity, Fair Value | 18,446 | 23,118
States Of The U.S. And Political Subdivisions [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 147,990 | 147,748
Gross Unrealized Gains | 6,236 | 6,877
Gross Unrealized Losses | (81) |
Securities Held To Maturity, Fair Value | 154,145 | 154,625
Collateralized Debt Obligations [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,563 | 1,592
Gross Unrealized Losses | (176) | (314)
Securities Held To Maturity, Fair Value | 1,387 | 1,278
Other Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,324 | 1,582
Gross Unrealized Gains |  | 25
Gross Unrealized Losses | (23) | (181)
Securities Held To Maturity, Fair Value | $ 1,301 | $ 1,426

X
- Definition Held to maturity debt securities unrecognized holding gains. + References No definition available. + Details
Name: | fnb_HeldToMaturityDebtSecuritiesUnrecognizedHoldingGains
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Held to maturity debt securities unrecognized holding losses. + References No definition available. + Details
Name: | fnb_HeldToMaturityDebtSecuritiesUnrecognizedHoldingLosses
Namespace Prefix: | fnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNetCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt securities as of the balance sheet date and which are categorized as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 137 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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