Derivatives and Hedging Activities (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Amounts of Recognized Assets	$ 26,576		$ 30,426
Summary of changes in fair value of residential mortgage loans commitments, forward sales agreements, and loans held for sale
TOTAL CHANGE IN FAIR VALUE
INTEREST RATE LOCK COMMITMENTS [Member]
Summary of changes in fair value of residential mortgage loans commitments, forward sales agreements, and loans held for sale
TOTAL CHANGE IN FAIR VALUE	29	(284)
FORWARD SALES AGREEMENTS [Member]
Summary of changes in fair value of residential mortgage loans commitments, forward sales agreements, and loans held for sale
TOTAL CHANGE IN FAIR VALUE	111	554
LOANS HELD FOR SALE FAIR VALUE ADJUSTMENT [Member]
Summary of changes in fair value of residential mortgage loans commitments, forward sales agreements, and loans held for sale
TOTAL CHANGE IN FAIR VALUE	(140)	(270)
Foreign exchange contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Amounts of Recognized Assets	803		1,748
Other Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Amounts of Recognized Assets	26,576		30,426
Other Assets [Member] | Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Amounts of Recognized Assets	$ 803		$ 1,748