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

FAIR VALUE MEASUREMENT (Carrying Amount And Estimated Fair Value Of Financial Instruments) (Detail) (Fair Value Measurements Nonrecurring [Member], 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]
Impaired loans	$ 21,631	$ 25,696
Other real estate owned and repossessed assets	6,840us-gaap_OtherAssetsFairValueDisclosure	12,861us-gaap_OtherAssetsFairValueDisclosure
Total assets at fair value	28,471us-gaap_AssetsFairValueDisclosure	38,557us-gaap_AssetsFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other real estate owned and repossessed assets	0	0
Total assets at fair value	0	0
Fair Value Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Other real estate owned and repossessed assets	0	0
Total assets at fair value	0	0
Fair Value Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	21,631	25,696
Other real estate owned and repossessed assets	6,840	12,861
Total assets at fair value	$ 28,471	$ 38,557