Credit Quality Assessment (Activity in Allowance for Loan and Lease Losses by Respective Loan Portfolio Segment) (Detail) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	$ 37,802,000	$ 38,766,000	$ 38,766,000
Provision (credit)	597,000		(163,000)
Charge-offs	(1,114,000)		(2,687,000)
Loan and lease recoveries	190,000	959,000	1,886,000
Net charge-offs	(924,000)	242,000	(801,000)
Balance at period end	37,475,000	38,026,000	37,802,000
Total loans and leases	3,164,706,000		3,127,392,000
Allowance for loans and leases to total loans and leases ratio	1.18%		1.21%
Balance of loans specifically evaluated for impairment	31,204,000		29,419,000
Allowance for loans specifically evaluated for impairment	2,650,000		2,894,000
Specific allowance to specific loans ratio	8.49%		9.84%
Balance of loans collectively evaluated	3,133,502,000		3,097,973,000
Allowance for loans collectively evaluated	34,825,000		34,908,000
Collective allowance to collective loans ratio	1.11%sasr_PercentageAllowanceOnLosses		1.13%sasr_PercentageAllowanceOnLosses
Commercial
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	5,852,000	6,308,000	6,308,000
Provision (credit)	(312,000)		(1,204,000)
Charge-offs	(19,000)		(729,000)
Loan and lease recoveries	108,000		1,477,000
Net charge-offs	89,000		748,000
Balance at period end	5,629,000		5,852,000
Total loans and leases	385,452,000		390,781,000
Allowance for loans and leases to total loans and leases ratio	1.46%		1.50%
Balance of loans specifically evaluated for impairment	4,860,000		3,894,000
Allowance for loans specifically evaluated for impairment	1,058,000		788,000
Specific allowance to specific loans ratio	21.77%		20.24%
Balance of loans collectively evaluated	380,592,000		386,887,000
Allowance for loans collectively evaluated	4,571,000		5,064,000
Collective allowance to collective loans ratio	1.20%		1.31%
Leases
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	9,000	16,000	16,000
Provision (credit)	0		(7,000)
Charge-offs	0		0
Loan and lease recoveries	0		0
Net charge-offs	0		0
Balance at period end	9,000		9,000
Total loans and leases	36,000		54,000
Allowance for loans and leases to total loans and leases ratio	25.02%		16.80%
Balance of loans collectively evaluated	36,000		54,000
Allowance for loans collectively evaluated	9,000		9,000
Collective allowance to collective loans ratio	25.02%		16.80%
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	3,592,000	4,142,000	4,142,000
Provision (credit)	318,000		119,000
Charge-offs	(99,000)		(834,000)
Loan and lease recoveries	56,000		165,000
Net charge-offs	(43,000)		(669,000)
Balance at period end	3,867,000		3,592,000
Total loans and leases	428,531,000		425,552,000
Allowance for loans and leases to total loans and leases ratio	0.90%		0.84%
Balance of loans collectively evaluated	428,531,000		425,552,000
Allowance for loans collectively evaluated	3,867,000		3,592,000
Collective allowance to collective loans ratio	0.90%		0.84%
Commercial Real Estate Portfolio Segment \| Commercial Acquisition, Development and Construction
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	4,267,000	3,754,000	3,754,000
Provision (credit)	(112,000)		1,042,000
Charge-offs	(706,000)		(529,000)
Loan and lease recoveries	0		0
Net charge-offs	(706,000)		(529,000)
Balance at period end	3,449,000		4,267,000
Total loans and leases	203,731,000		205,124,000
Allowance for loans and leases to total loans and leases ratio	1.69%		2.08%
Balance of loans specifically evaluated for impairment	1,363,000		2,464,000
Allowance for loans specifically evaluated for impairment	48,000		741,000
Specific allowance to specific loans ratio	3.52%		30.07%
Balance of loans collectively evaluated	202,368,000		202,660,000
Allowance for loans collectively evaluated	3,401,000		3,526,000
Collective allowance to collective loans ratio	1.68%		1.74%
Commercial Real Estate Portfolio Segment \| Commercial Investor Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	9,784,000	9,263,000	9,263,000
Provision (credit)	261,000		486,000
Charge-offs	0		(3,000)
Loan and lease recoveries	5,000		38,000
Net charge-offs	5,000		35,000
Balance at period end	10,050,000		9,784,000
Total loans and leases	668,931,000		640,193,000
Allowance for loans and leases to total loans and leases ratio	1.50%		1.53%
Balance of loans specifically evaluated for impairment	12,194,000		10,279,000
Allowance for loans specifically evaluated for impairment	545,000		541,000
Specific allowance to specific loans ratio	4.47%		5.26%
Balance of loans collectively evaluated	656,737,000		629,914,000
Allowance for loans collectively evaluated	9,505,000		9,243,000
Collective allowance to collective loans ratio	1.45%		1.47%
Commercial Real Estate Portfolio Segment \| Commercial Owner Occupied Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	7,143,000	6,308,000	6,308,000
Provision (credit)	328,000		1,094,000
Charge-offs	(213,000)		(265,000)
Loan and lease recoveries	1,000		6,000
Net charge-offs	(212,000)		(259,000)
Balance at period end	7,259,000		7,143,000
Total loans and leases	618,846,000		611,061,000
Allowance for loans and leases to total loans and leases ratio	1.17%		1.17%
Balance of loans specifically evaluated for impairment	8,974,000		8,941,000
Allowance for loans specifically evaluated for impairment	999,000		824,000
Specific allowance to specific loans ratio	11.13%		9.22%
Balance of loans collectively evaluated	609,872,000		602,120,000
Allowance for loans collectively evaluated	6,260,000		6,319,000
Collective allowance to collective loans ratio	1.03%		1.05%
Residential Real Estate Portfolio Segment \| Residential Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	6,232,000	7,819,000	7,819,000
Provision (credit)	143,000		(1,385,000)
Charge-offs	(77,000)		(323,000)
Loan and lease recoveries	12,000		121,000
Net charge-offs	(65,000)		(202,000)
Balance at period end	6,310,000		6,232,000
Total loans and leases	728,858,000		717,886,000
Allowance for loans and leases to total loans and leases ratio	0.87%		0.87%
Balance of loans specifically evaluated for impairment	3,813,000		3,535,000
Allowance for loans specifically evaluated for impairment	0		0
Balance of loans collectively evaluated	725,045,000		714,351,000
Allowance for loans collectively evaluated	6,310,000		6,232,000
Collective allowance to collective loans ratio	0.87%		0.87%
Residential Real Estate Portfolio Segment \| Residential Construction
Financing Receivable Allowance For Credit Losses [Line Items]
Balance at beginning of year	923,000	1,156,000	1,156,000
Provision (credit)	(29,000)		(308,000)
Charge-offs	0		(4,000)
Loan and lease recoveries	8,000		79,000
Net charge-offs	8,000		75,000
Balance at period end	902,000		923,000
Total loans and leases	130,321,000		136,741,000
Allowance for loans and leases to total loans and leases ratio	0.69%		0.67%
Balance of loans specifically evaluated for impairment			306,000
Allowance for loans specifically evaluated for impairment			0
Balance of loans collectively evaluated	130,321,000		136,435,000
Allowance for loans collectively evaluated	$ 902,000		$ 923,000
Collective allowance to collective loans ratio	0.00%		0.68%

Reflects the percentage derived from dividing total credit loss allowance by total loans.

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Financing Receivable, Allowance for Credit Losses, Net Charge Offs

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Percentage of credit loss allowance to loans for loans collectively evaluated for impairment.

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Percentage of credit loss allowance for loans specifically evaluated for impairment.

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A valuation allowance for financing receivables that are expected to be uncollectible.

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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