ServisFirst Bancshares, Inc. Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENT (Financial Assets And Financial Liabilities Carried At Fair Value On A Recurring Basis) (Detail)

FAIR VALUE MEASUREMENT (Financial Assets And Financial Liabilities Carried At Fair Value On A Recurring Basis) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 298,310us-gaap_AvailableForSaleSecurities	$ 265,728us-gaap_AvailableForSaleSecurities
Fair Value Measurements Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	298,310	265,728
Fair Value Measurements Recurring [Member] \| U.S. Treasury and Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	51,138	32,274
Fair Value Measurements Recurring [Member] \| Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	95,523	87,748
Fair Value Measurements Recurring [Member] \| State and Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	135,663	129,831
Fair Value Measurements Recurring [Member] \| Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	15,986	15,875
Fair Value Measurements Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Fair Value Measurements Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| U.S. Treasury and Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value Measurements Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value Measurements Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| State and Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value Measurements Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	298,310	265,728
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| U.S. Treasury and Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	51,138	32,274
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	95,523	87,748
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| State and Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	135,663	129,831
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 2 [Member] \| Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	15,986	15,875
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| U.S. Treasury and Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| State and Municipal Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	0	0
Fair Value Measurements Recurring [Member] \| Fair Value Inputs Level 3 [Member] \| Corporate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities	$ 0	$ 0