Acquisitions (Details) (USD $)	9 Months Ended
Sep. 30, 2011
Tower [Member]
Business Acquisition [Line Items]
Value of business acquired in stock-for-stock and cash transaction	$ 343,000,000
Number of shares of Susquehanna common stock for each share of common stock	3.4696
Cash paid per share, acquisition	28.00
Aggregate consideration paid in cash	88,000,000
Abington [Member]
Business Acquisition [Line Items]
Value of business acquired in stock-for-stock and cash transaction	145,908,000
Book value of business acquired in stock-for-stock and cash transaction	$ 205,866,000
Number of shares of Susquehanna common stock for each share of common stock	1.32

Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 99-12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant