ServisFirst Bancshares, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Amortized Cost And Fair Value Of Available For Sale And Held To Maturity Securities (Detail)

Amortized Cost And Fair Value Of Available For Sale And Held To Maturity Securities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 223,877	$ 282,647
Gross Unrealized Gain	12,714	11,256
Gross Unrealized Loss	(9)	(94)
Market Value	236,582	293,809
Amortized Cost	20,791	15,209
Gross Unrealized Gain	1,536	790
Gross Unrealized Loss	0	0
Market Value	22,327	15,999
U S Treasury And Government [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	32,355	98,169
Gross Unrealized Gain	1,139	1,512
Gross Unrealized Loss	0	(59)
Market Value	33,494	99,622
Mortgage Backed Securities [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	77,067	88,118
Gross Unrealized Gain	4,890	4,462
Gross Unrealized Loss	0	0
Market Value	81,957	92,580
Amortized Cost	15,254	9,676
Gross Unrealized Gain	860	410
Gross Unrealized Loss	0
Market Value	16,114	10,086
U S States And Political Subdivisions [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	108,682	95,331
Gross Unrealized Gain	6,523	5,230
Gross Unrealized Loss	(9)	(35)
Market Value	115,196	100,526
Amortized Cost	5,537	5,533
Gross Unrealized Gain	676	380
Gross Unrealized Loss	0	0
Market Value	6,213	5,913
Corporate Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Amortized Cost	5,773	1,029
Gross Unrealized Gain	162	52
Gross Unrealized Loss	0	0
Market Value	$ 5,935	$ 1,081

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name FASB Staff Position (FSP)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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-Name Accounting Standards Codification

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

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-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 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-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 9: http://www.xbrl.org/2003/role/presentationRef

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Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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+ Details

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References + Details

- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References + Details

- 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 + Details

- Definition

As of the balance sheet date, the excess of fair value over carrying value (amortized cost) of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding gain.

+ References + Details

- Definition

As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a debt security categorized as held-to-maturity, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss.

+ References + Details