Branch Acquisitions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012 store
Significant Acquisitions and Disposals [Line Items]
Reduction in goodwill	$ 432
HSBC Bank USA [Member]
Significant Acquisitions and Disposals [Line Items]
Number of bank branches		4
First Niagara Bank [Member]
Significant Acquisitions and Disposals [Line Items]
Number of bank branches		4
Estimated fair value refinement period, number of years	1 year
Loan portfolio at fair value discount	824
Time deposit premium	$ 335