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EMPLOYEE AND DIRECTOR BENEFITS - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2005
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Sep. 30, 2008
Servisfirst Capital Trust I
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Jun. 30, 2012
Stock Options
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Jun. 30, 2012
Restricted Stock
Person
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Jun. 30, 2012
Amended And Restated 2005 Stock Incentive Plan
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Jun. 30, 2012
Stock Incentive Plan 2009
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Jun. 30, 2012
Nonqualified Stock Options
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Jun. 30, 2012
Nonqualified Stock Options
Minimum
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Jun. 30, 2012
Nonqualified Stock Options
Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||
| Share based compensation | $ 262,000 | $ 240,000 | $ 522,000 | $ 465,000 | |||||||||||
| Shares available for grant | 1,025,000 | 425,000 | 55,000 | ||||||||||||
| Option expiration term (years) | 10 years | 10 years | 10 years | ||||||||||||
| Stock option exercise price per share | $ 19.11 | $ 17.34 | $ 19.11 | $ 17.34 | $ 18.33 | $ 15.65 | $ 15.00 | $ 20.00 | |||||||
| Weighted average fair value of options granted | $ 6.43 | $ 8.54 | |||||||||||||
| Unrecognized compensation cost related to non-vested award | $ 1,940,000 | $ 362,000 | |||||||||||||
| Unrecognized compensation cost related to non-vested award, recognition period | 5 years 9 months 18 days | 2 years 6 months | |||||||||||||
| Non vested share issued | 26,000 | ||||||||||||||
| Number of employees participating in restricted stock | 5 | ||||||||||||||
| Vesting Period | 5 years | ||||||||||||||
| Stock warrants granted | 60,000 | ||||||||||||||
| Fair market value of common stock at the date of the grant | $ 10 | ||||||||||||||
| Stock warrants granted, Vesting Period | 3 years | 3 years | |||||||||||||
| Warrants outstanding | 20,000 | 60,000 | 20,000 | 60,000 | |||||||||||
| Issuance Of common stock warrant, Shares | 75,000 | ||||||||||||||
| Common stock warrant, price per Shares | 25 | ||||||||||||||