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	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Junior Subordinated Debentures [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Junior subordinated debentures, at fair value, Beginning Balance	$ 249,294	$ 87,274
Junior subordinated debentures, at fair value, Change included in earnings	16,005	12,303
Junior subordinated debentures, at fair value, Purchases and issuances	0	156,840
Junior subordinated debentures, at fair value, Sales and settlements	(9,842)	(7,123)
Junior subordinated debentures, at fair value, Ending Balance	255,457	249,294
Junior subordinated debentures, at fair value, Net change in unrealized gains or (losses) relating to items held at end of period	16,005	12,303
Interest Rate Lock Commitments [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Interest rate lock commitment, Beginning Balance	2,867	706
Interest rate lock commitment, Change included in earnings	851	(3,716)
Interest rate lock commitment, Purchases and issuances	47,764	28,350
Interest rate lock commitment, Sales and settlements	(47,851)	(22,473)
Interest rate lock commitment, Ending Balance	3,631	2,867
Interest rate lock commitment, Net change in unrealized gains or (losses) relating to items held at end of period	3,631	2,867
Mortgage Servicing Rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mortgage servicing rights, at fair value, Beginning Balance	117,259	47,765
Mortgage servicing rights, at fair value, Change included in earnings	(20,726)	(16,587)
Mortgage servicing rights, at fair value, Purchases and issuances	35,284	86,081
Mortgage servicing rights, at fair value, Sales and settlements	0	0
Mortgage servicing rights, at fair value, Ending Balance	131,817	117,259
Mortgage servicing rights, at fair value, Net change in unrealized gains or (losses) relating to items held at end of period	$ (14,270)	$ (13,430)