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		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage servicing rights, Beginning Balance	$ 22,513	$ 16,350	$ 18,184	$ 14,454
Mortgage servicing rights, Change included in earnings	(3,666)	(1,431)	(5,618)	(1,942)
Mortgage servicing rights, Purchases and issuances	5,642	1,693	11,923	4,100
Mortgage servicing rights, Ending Balance	24,489	16,612	24,489	16,612
Mortgage servicing rights, Net change in unrealized gains or (losses) relating to items held at end of period	(2,720)	(1,116)	(2,570)	(1,037)
Junior subordinated debentures, Beginning Balance	83,993	81,766	82,905	80,688
Junior subordinated debentures, Change included in earnings	1,592	1,531	4,780	4,564
Junior subordinated debentures, Sales and settlements	(1,047)	(973)	(3,147)	(2,928)
Junior subordinated debentures, Ending Balance	84,538	82,324	84,538	82,324
Junior subordinated debentures, Net change in unrealized gains or (losses) relating to items held at end of period	$ 1,592	$ 1,531	$ 4,780	$ 4,564