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REGULATORY MATTERS (Company's and Bank's actual capital amounts and ratios) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Sandy Spring Bancorp, Inc    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount, Capital $ 818,393 $ 531,070
Actual Amount, Tier One Risk Based Capital 737,883 485,814
Actual Amount, Common Equity Tier 1 Capital 727,481 485,814
Actual Amount, Tier One Leverage Capital $ 737,883 $ 485,814
Actual Ratio, Capital 12.26% 11.85%
Actual Ratio, Tier One Risk Based Capital 11.06% 10.84%
Actual Ratio, Common Equity Tier 1 Capital 10.90% 10.84%
Actual Ratio, Tier One Leverage Capital 9.50% 9.24%
For Capital Adequacy Purposes Amount, Capital $ 533,994 $ 358,501
For Capital Adequacy Purposes Amount, Tier One Risk Based Capital 400,496 268,875
For Capital Adequacy Purposes Amount, Common Equity Tier 1 Capital 300,372 201,657
For Capital Adequacy Purposes Amount, Tier One Leverage Capital $ 310,807 $ 210,407
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 $ 780,858 $ 508,514
Actual Amount, Tier One Risk Based Capital 727,371 463,257
Actual Amount, Common Equity Tier 1 Capital 727,371 463,257
Actual Amount, Tier One Leverage Capital $ 727,371 $ 463,257
Actual Ratio, Capital 11.72% 11.38%
Actual Ratio, Tier One Risk Based Capital 10.92% 10.37%
Actual Ratio, Common Equity Tier 1 Capital 10.92% 10.37%
Actual Ratio, Tier One Leverage Capital 9.38% 8.82%
For Capital Adequacy Purposes Amount, Capital $ 532,970 $ 357,352
For Capital Adequacy Purposes Amount, Tier One Risk Based Capital 399,728 268,014
For Capital Adequacy Purposes Amount, Common Equity Tier 1 Capital 299,796 201,011
For Capital Adequacy Purposes Amount, Tier One Leverage Capital $ 310,224 $ 210,006
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 $ 666,213 $ 446,690
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Tier One Risk Based Capital 532,970 357,352
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Common Equity Tier 1 Capital 433,038 290,349
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount, Tier One Leverage Capital $ 387,780 $ 262,508
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%