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Loans & Leases (Narrative) (Detail) (USD $)	Mar. 31, 2013
Financing Receivable Recorded Investment [Line Items]
Significant Credit Rating Loans	$ 1,000,000

X

- Definition

Significant Credit Rating Loans

+ References

No definition available.

+ Details

Name:	susq_SignificantCreditRatingLoans
Namespace Prefix:	susq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration