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REGULATORY MATTERS (Company's and Bank's actual capital amounts and ratios) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Sandy Spring Bancorp, Inc    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount, Capital $ 531,070 $ 529,990
Actual Amount, Tier One Risk Based Capital 485,814 485,923
Actual Amount, Common Equity Tier 1 Capital 485,814 455,923
Actual Amount, Tier One Leverage Capital $ 485,814 $ 485,923
Actual Ratio, Capital 11.85% 12.80%
Actual Ratio, Tier One Risk Based Capital 10.84% 11.74%
Actual Ratio, Common Equity Tier 1 Capital 10.84% 11.01%
Actual Ratio, Tier One Leverage Capital 9.24% 10.14%
For Capital Adequacy Purposes Amount, Capital $ 358,501 $ 331,177
For Capital Adequacy Purposes Amount, Tier One Risk Based Capital 268,875 248,383
For Capital Adequacy Purposes Amount, Common Equity Tier 1 Capital 201,657 186,287
For Capital Adequacy Purposes Amount, Tier One Leverage Capital $ 210,407 $ 191,776
For Capital Adequacy Purposes Ratio, Capital 8.00% 8.00%
For Capital Adequacy Purposes Ratio, Tier One Risk Based Capital 6.00% 6.00%
For Capital Adequacy Purposes Ratio, Common Equity Tier 1 Capital 4.50% 4.50%
For Capital Adequacy Purposes Ratio, Tier One Leverage Capital 4.00% 4.00%
Sandy Spring Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount, Capital $ 508,514 $ 508,593
Actual Amount, Tier One Risk Based Capital 463,257 434,526
Actual Amount, Common Equity Tier 1 Capital 463,257 434,526
Actual Amount, Tier One Leverage Capital $ 463,257 $ 434,526
Actual Ratio, Capital 11.38% 12.33%
Actual Ratio, Tier One Risk Based Capital 10.37% 10.53%
Actual Ratio, Common Equity Tier 1 Capital 10.37% 10.53%
Actual Ratio, Tier One Leverage Capital 8.82% 9.09%
For Capital Adequacy Purposes Amount, Capital $ 357,352 $ 330,023
For Capital Adequacy Purposes Amount, Tier One Risk Based Capital 268,014 247,517
For Capital Adequacy Purposes Amount, Common Equity Tier 1 Capital 201,011 185,638
For Capital Adequacy Purposes Amount, Tier One Leverage Capital $ 210,006 $ 191,304
For Capital Adequacy Purposes Ratio, Capital 8.00% 8.00%
For Capital Adequacy Purposes Ratio, Tier One Risk Based Capital 6.00% 6.00%
For Capital Adequacy Purposes Ratio, Common Equity Tier 1 Capital 4.50% 4.50%
For Capital Adequacy Purposes Ratio, Tier One Leverage Capital 4.00% 4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Capital $ 446,690 $ 412,529
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Tier One Risk Based Capital 357,352 330,023
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Common Equity Tier 1 Capital 290,349 268,144
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Tier One Leverage Capital $ 262,508 $ 239,130
To Be Well Capitalized Under Prompt Action Provisions Ratio, Capital 10.00% 10.00%
To Be Well Capitalized Under Prompt Action Provisions Ratio, Tier One Risk Based Capital 8.00% 8.00%
To Be Well Capitalized Under Prompt Action Provisions Ratio, Common Equity Tier 1 Capital 6.50% 6.50%
To Be Well Capitalized Under Prompt Action Provisions Ratio, Tier One Leverage Capital 5.00% 5.00%