Annual report pursuant to Section 13 and 15(d)

REGULATORY MATTERS (The Company's And Bank's Actual Capital Amounts And Ratios) (Details)

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REGULATORY MATTERS (The Company's And Bank's Actual Capital Amounts And Ratios) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Servisfirst Bank [Member]    
CET I Capital to Risk Weighted Assets, Amount $ 560,731 $ 439,279
CET I Capital to Risk Weighted Assets, Ratio 10.77% 9.89%
CET I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount $ 234,232 $ 199,806
CET I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Ratio 4.50% 4.50%
CET I Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 338,335 $ 288,608
CET I Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.50% 6.50%
Tier I Capital to Risk Weighted Assets, Actual Amount $ 561,108 $ 439,656
Tier I Capital to Risk Weighted Assets, Actual Ratio 10.78% 9.90%
Tier I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount $ 312,309 $ 266,407
Tier I Capital to Risk Weighted Assets, For Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Tier I Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 416,413 $ 355,210
Tier I Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 8.00% 8.00%
Total Capital to Risk Weighted Assets, Actual Amount $ 613,501 $ 483,575
Total Capital to Risk Weighted Assets, Actual Ratio 11.79% 10.89%
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount $ 416,413 $ 355,210
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Total Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 520,516 $ 444,012
Total Capital to Risk Weighted Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 10.00% 10.00%
Tier I Capital to Average Assets, Actual Amount $ 561,108 $ 439,656
Tier I Capital to Average Assets, Actual Ratio 9.06% 8.71%
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Amount $ 247,760 $ 202,023
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4.00% 4.00%
Tier I Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 309,700 $ 252,529
Tier I Capital to Average Assets, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 5.00% 5.00%
Consolidated Entities [Member]    
CET I Capital to Risk Weighted Assets, Amount $ 508,982 $ 431,642
CET I Capital to Risk Weighted Assets, Ratio 9.78% 9.72%
CET I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount $ 234,262 $ 199,836
CET I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Ratio 4.50% 4.50%
Tier I Capital to Risk Weighted Assets, Actual Amount $ 509,359 $ 432,019
Tier I Capital to Risk Weighted Assets, Actual Ratio 9.78% 9.73%
Tier I Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount $ 312,350 $ 266,448
Tier I Capital to Risk Weighted Assets, For Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Total Capital to Risk Weighted Assets, Actual Amount $ 616,415 $ 530,688
Total Capital to Risk Weighted Assets, Actual Ratio 11.84% 11.95%
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Amount $ 416,467 $ 355,264
Total Capital to Risk Weighted Assets, For Capital Adequacy Purposes, Ratio 8.00% 8.00%
Tier I Capital to Average Assets, Actual Amount $ 509,359 $ 432,019
Tier I Capital to Average Assets, Actual Ratio 8.22% 8.55%
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Amount $ 247,777 $ 202,043
Tier I Capital to Average Assets, For Capital Adequacy Purposes, Ratio 4.00% 4.00%