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Regulatory Capital Requirements (Schedule Of Total Risk-Based, Tier 1 Risk-Based, And Tier 1 Leverage Ratios) (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
Stifel Financial Corp. [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Common equity tier 1, Actual Amount $ 1,812,069
Common equity tier 1, Actual Ratio 20.80%
Common equity tier 1, For Capital Adequacy Purposes Amount $ 521,409
Common equity tier 1, For Capital Adequacy Purposes Ratio 6.00%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 695,213
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 8.00%
Total capital, Actual Amount $ 1,863,369
Total capital, Actual Ratio 21.40%
Total capital, For Capital Adequacy Purposes Amount $ 695,213
Total capital, For Capital Adequacy Purposes Ratio 8.00%
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 869,016
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00%
Tier 1 leverage, Actual Amount $ 1,812,069
Tier 1 leverage, Actual Ratio 10.10%
Tier 1 leverage, For Capital Adequacy Purposes Amount $ 715,179
Tier 1 leverage, For Capital Adequacy Purposes Ratio 4.00%
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 893,974
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00%
Stifel Financial Corp. [Member] | Common Stock [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Common equity tier 1, Actual Amount $ 1,602,851
Common equity tier 1, Actual Ratio 18.40%
Common equity tier 1, For Capital Adequacy Purposes Amount $ 391,057
Common equity tier 1, For Capital Adequacy Purposes Ratio 4.50%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 564,860
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 6.50%
Stifel Bank [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Common equity tier 1, Actual Amount $ 928,829
Common equity tier 1, Actual Ratio 15.40%
Common equity tier 1, For Capital Adequacy Purposes Amount $ 362,398
Common equity tier 1, For Capital Adequacy Purposes Ratio 6.00%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 483,198
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 8.00%
Total capital, Actual Amount $ 980,884
Total capital, Actual Ratio 16.20%
Total capital, For Capital Adequacy Purposes Amount $ 483,198
Total capital, For Capital Adequacy Purposes Ratio 8.00%
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 603,997
Total capital, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00%
Tier 1 leverage, Actual Amount $ 928,829
Tier 1 leverage, Actual Ratio 7.20%
Tier 1 leverage, For Capital Adequacy Purposes Amount $ 518,900
Tier 1 leverage, For Capital Adequacy Purposes Ratio 4.00%
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 648,625
Tier 1 leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00%
Stifel Bank [Member] | Common Stock [Member]  
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]  
Common equity tier 1, Actual Amount $ 928,829
Common equity tier 1, Actual Ratio 15.40%
Common equity tier 1, For Capital Adequacy Purposes Amount $ 271,799
Common equity tier 1, For Capital Adequacy Purposes Ratio 4.50%
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 392,598
Common equity tier 1, To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 6.50%