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Regulatory Matters (Company's and Bank's actual capital amounts and ratios) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Parent Company [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount, Capital $ 519,179 $ 511,845
Actual Amount, Tier One Risk Based Capital 478,284 474,042
Actual Amount, Common Equity Tier 1 Capital 443,284  
Actual Amount, Tier One Leverage Capital $ 478,284 $ 474,042
Actual Ratio, Capital 14.25% 15.06%
Actual Ratio, Tier One Risk Based Capital 13.13% 13.95%
Actual Ratio, Common Equity Tier 1 Capital 12.17%  
Actual Ratio, Tier One Leverage Capital 10.60% 11.26%
For Capital Adequacy Purposes Amount, Capital $ 291,444 $ 271,925
For Capital Adequacy Purposes Amount, Tier One Risk Based Capital 218,583 135,962
For Capital Adequacy Purposes Amount, Common Equity Tier 1 Capital 163,937  
For Capital Adequacy Purposes Amount, Tier One Leverage Capital $ 180,463 $ 126,261
For Capital Adequacy Purposes Ratio, Capital 8.00% 8.00%
For Capital Adequacy Purposes Ratio, Tier One Risk Based Capital 6.00% 4.00%
For Capital Adequacy Purposes Ratio, Common Equity Tier 1 Capital 4.50%  
For Capital Adequacy Purposes Ratio, Tier One Leverage Capital 4.00% 3.00%
Sandy Spring Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount, Capital $ 505,510 $ 497,832
Actual Amount, Tier One Risk Based Capital 429,615 425,029
Actual Amount, Common Equity Tier 1 Capital 429,615  
Actual Amount, Tier One Leverage Capital $ 429,615 $ 425,029
Actual Ratio, Capital 13.90% 14.66%
Actual Ratio, Tier One Risk Based Capital 11.81% 12.52%
Actual Ratio, Common Equity Tier 1 Capital 11.81%  
Actual Ratio, Tier One Leverage Capital 9.53% 10.11%
For Capital Adequacy Purposes Amount, Capital $ 290,920 $ 271,676
For Capital Adequacy Purposes Amount, Tier One Risk Based Capital 218,190 135,838
For Capital Adequacy Purposes Amount, Common Equity Tier 1 Capital 163,642  
For Capital Adequacy Purposes Amount, Tier One Leverage Capital $ 180,279 $ 126,152
For Capital Adequacy Purposes Ratio, Capital 8.00% 8.00%
For Capital Adequacy Purposes Ratio, Tier One Risk Based Capital 6.00% 4.00%
For Capital Adequacy Purposes Ratio, Common Equity Tier 1 Capital 4.50%  
For Capital Adequacy Purposes Ratio, Tier One Leverage Capital 4.00% 3.00%
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% 6.00%
To Be Well Capitalized Under Prompt Action Provisions Ratio, Common Equity Tier 1 Capital 6.50%  
To Be Well Capitalized Under Prompt Action Provisions Ratio, Tier One Leverage Capital 5.00% 5.00%