Fair Value Measurement (Schedule Of Reconciliation Of Assets And Liabilities Measured At Fair Value Using Significant Unobservable Inputs (Level 3) On A Recurring Basis) (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights, Beginning Balance	$ 20,210	$ 15,605	$ 18,184	$ 14,454
Mortgage servicing rights, Change included in earnings	(1,030)	(328)	(1,952)	(511)
Mortgage servicing rights, Purchases and issuances	3,333	1,073	6,281	2,407
Mortgage servicing rights, Ending Balance	22,513	16,350	22,513	16,350
Mortgage servicing rights, Net change in unrealized gains or (losses) relating to items held at end of period	(84)	(45)	(197)	79
Junior subordinated debentures, Beginning Balance	83,453	81,220	82,905	80,688
Junior subordinated debentures, Change included in earnings	1,587	1,523	3,188	3,033
Junior subordinated debentures, Sales and settlements	(1,047)	(977)	(2,100)	(1,955)
Junior subordinated debentures, Ending Balance	83,993	81,766	83,993	81,766
Junior subordinated debentures, Net change in unrealized gains or (losses) relating to items held at end of period	$ 1,587	$ 1,523	$ 3,188	$ 3,033