| **Shareholders' Equity (Share-based Compensation - Narrative) (Details) (USD $)**                         | 12 Months Ended |          |          | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |         | 12 Months Ended |         | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------|-----------------|----------|----------|-----------------|----------------|-----------------|----------------|---------|-----------------|---------|-----------------|
||
| **Share-based Compensation Arrangement by Share-based Payment Award [Line Items]**                        |            |     |     |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Number of share-based compensation plans                                                                  | 5               | 5        | 5        |            |           |            | 3              |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Share-based compensation expense                                                                          | $ 3,000         | $ 23,000 | $ 50,000 |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Share-based compensation expense related income tax benefit                                               | 1,000           | 9,000    | 7,000    |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Shares authorized for issuance                                                                            |            |     |     |            |           |            |           |    |            |    |            |   |   |   | 600,000 |   |   |   |   |   |   |   |
| Maximum number of shares of FNB common stock each employee may be granted during any calendar year period |            |     |     |            |           |            |           |    |            |    |            |   |   |   | 50,000 |   |   |   |   |   |   |   |
| Awards granted (in shares)                                                                                |            |     |     |            |           |            |           | 110,059 | 0               |    |            |   | 110,059 |   |   | 110,059 |   |   |   |   |   |   |
| Number of officers granted                                                                                |            |     |     |            |           |            |           |    |            |    |            |   | 6 |   |   | 6 |   |   |   |   |   |   |
| Award become exercisable period                                                                           |            |     |     |            |           |            |           |    |            |    |            |   |   |   |   |   |   | 1 year |   |   | 1 year |   |
| Award vesting period                                                                                      |            |     |     |            |           |            |           |    |            |    |            |   |   |   |   |   |   | 5 years |   |   | 5 years |   |
| Award expiration period                                                                                   |            |     |     |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   | 10 years |   |   | 10 years |
| Number of shares available for grants                                                                     |            |     |     |            |           | 0               |           |    |            |    |            |   |   |   |   |   | 0 |   |   | 8,243 |   |   |
| Maximum number of shares of common stock reserved for issuance                                            |            |     |     |            |           | 235             |           |    |            |    |            |   |   |   |   |   | 729 |   |   | 10,985 |   |   |
| Stock options assumed from acquisition (in shares)                                                        | 0               | 78       | 0        |            | 78             |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Stock options exercisable (in shares)                                                                     |            |     |     | 0               |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Stock options expired (in shares)                                                                         |            |     |     | 78              |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Stock options granted (in shares)                                                                         | 0               | 0        | 0        |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Stock options exercised, intrinsic value                                                                  | 0               | 0        | 0        |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Stock options vested, grant date fair value                                                               | 0               | 0        | 0        |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Stock options exercised (in shares)                                                                       | 0               | 0        | 0        |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Awards vested, fair value                                                                                 |            |     |     |            |           |            |           | 1,040   | 1,040           | 114,600 |            |   |   |   |   |   |   |   |   |   |   |   |
| Award vesting percentage                                                                                  |            |     |     |            |           |            |           |    |            |    | 66.67%          | 33.33% |   |   |   |   |   |   |   |   |   |   |
| Unrecognized compensation cost related to non-vested share-based compensation arrangements                | $ 1,200,000     |     |     |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| **Black-Scholes option pricing model, fair value assumptions:**                                           |            |     |     |            |           |            |           |    |            |    |            |   |   |   |   |   |   |   |   |   |   |   |
| Expected volatility, period of historical volatility                                                      |            |     |     |            |           |            |           |    |            |    |            |   |   | 6 years |   |   |   |   |   |   |   |   |
| Expected life of options                                                                                  |            |     |     |            |           |            |           |    |            |    |            |   |   | 6 years |   |   |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                             |
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| - Definition
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| - Definition
Percentage of vesting of share-based compensation awards.
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No definition available.
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| - Definition
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| - Definition
Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
No definition available.
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| - Definition
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Historical Period
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No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
+ References
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| - Definition
Aggregate number of common shares reserved for future issuance.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.
+ References
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| - Definition
The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.
+ References
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| - Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| - Definition
The highest quantity of shares an employee can purchase under the plan per period.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.
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| - Definition
The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.
+ References
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| - Definition
Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Gross number of share options (or share units) granted during the period.
+ References
No definition available.
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| - Definition
The addition or reduction in the number of reserved shares that could potentially be issued under the option plan attributable to reasons other than grants, exercises, forfeitures, and expirations during the reporting period.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) -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.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of share options (or share units) exercised during the current period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770
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