Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended									0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Wealth Management [Member]	Dec. 31, 2012 Community Banking [Member]	Dec. 31, 2012 Specialty Finance [Member]	Dec. 31, 2012 Core Deposits [Member] Community Banking [Member]	Dec. 31, 2012 Customer Lists [Member] Wealth Management [Member]	Dec. 31, 2012 Customer Lists [Member] Specialty Finance [Member]	Feb. 03, 2011 Woodfield of Rolling Meadows, Illinois [Member]
Goodwill [Line Items]
Date of acquisition										Feb. 03, 2011
Goodwill Acquired	$ 39,388			$ 1,827	$ 15,627	$ 21,934
Finite-lived intangibles, useful life							10 years	10 years	18 years
Amortization of intangible assets	$ 4,324	$ 3,425	$ 2,739