Annual report pursuant to Section 13 and 15(d)

Note 16 - Regulatory Matters - The Company's and Bank's Actual Capital Amounts and Ratios (Details)

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Note 16 - Regulatory Matters - The Company's and Bank's Actual Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
CET 1 Capital to risk weighted assets, amount $ 593,111 $ 508,982
CET 1 Capital to risk weighted assets, ratio 9.51% 9.78%
CET 1 Capital to risk weighted assets, for capital adequacy purposes, amount $ 280,553 $ 234,262
CET 1 capital to risk weighted assets, for capital adequacy purposes, ratio 4.50% 4.50%
Tier 1 capital to risk weighted assets, amount $ 593,613 $ 509,359
Tier 1 capital to risk weighted assets, ratio 9.52% 9.78%
Tier 1 capital to risk weighted assets, for capital adequacy purposes, amount $ 374,070 $ 312,350
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio 6.00% 6.00%
Total capital to risk weighted assets, amount $ 718,151 $ 616,415
Total capital to risk weighted assets, ratio 11.52% 11.84%
Total capital to risk weighted assets, for capital adequacy purposes, amount $ 498,760 $ 416,467
Total capital to risk weighted assets, for capital adequacy purposes, ratio 8.00% 8.00%
Tier 1 capital to average assets, amount $ 593,613 $ 509,359
Tier 1 capital to average assets, ratio 8.51% 8.22%
Tier 1 capital to average assets, for capital adequacy purposes, amount $ 278,970 $ 247,777
Tier 1 capital to average assets, for capital adequacy purposes, ratio 4.00% 4.00%
Servisfirst Bank [Member]    
CET 1 Capital to risk weighted assets, amount $ 651,201 $ 560,731
CET 1 Capital to risk weighted assets, ratio 10.45% 10.77%
CET 1 Capital to risk weighted assets, for capital adequacy purposes, amount $ 280,523 $ 234,232
CET 1 capital to risk weighted assets, for capital adequacy purposes, ratio 4.50% 4.50%
CET 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, amount $ 405,199 $ 338,335
CET 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, ratio 6.50% 6.50%
Tier 1 capital to risk weighted assets, amount $ 651,703 $ 561,108
Tier 1 capital to risk weighted assets, ratio 10.45% 10.78%
Tier 1 capital to risk weighted assets, for capital adequacy purposes, amount $ 374,030 $ 312,309
Tier 1 capital to risk weighted assets, for capital adequacy purposes, ratio 6.00% 6.00%
Tier 1 capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, amount $ 498,707 $ 416,413
Tier 1 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, amount $ 711,609 $ 613,501
Total capital to risk weighted assets, ratio 11.42% 11.79%
Total capital to risk weighted assets, for capital adequacy purposes, amount $ 498,707 $ 416,413
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 $ 623,384 $ 520,516
Total capital to risk weighted assets, to be well capitalized under prompt corrective action provisions, ratio 10.00% 10.00%
Tier 1 capital to average assets, amount $ 651,703 $ 561,108
Tier 1 capital to average assets, ratio 9.35% 9.06%
Tier 1 capital to average assets, for capital adequacy purposes, amount $ 278,954 $ 247,760
Tier 1 capital to average assets, for capital adequacy purposes, ratio 4.00% 4.00%
Tier 1 capital to average assets, to be well capitalized under prompt corrective action provisions, amount $ 348,693 $ 309,700
Tier 1 capital to average assets, to be well capitalized uner prompt corrective action provisions, ratio 5.00% 5.00%