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	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
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	$ 87,274	$ 85,081
Junior subordinated debentures, at fair value, Change included in earnings	12,303	6,090
Junior subordinated debentures, at fair value, Purchases and issuances	156,840	0
Junior subordinated debentures, at fair value, Sales and settlements	(7,123)	(3,897)
Junior subordinated debentures, at fair value, Ending Balance	249,294	87,274
Junior subordinated debentures, at fair value, Net change in unrealized gains or (losses) relating to items held at end of period	12,303	6,090
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Interest rate lock commitment, Beginning Balance	706	1,478
Interest rate lock commitment, Change included in earnings	(3,716)	(1,478)
Interest rate lock commitment, Purchases and issuances	28,350	62,560
Interest rate lock commitment, Sales and settlements	(22,473)	(61,854)
Interest rate lock commitment, Ending Balance	2,867	706
Interest rate lock commitment, Net change in unrealized gains or (losses) relating to items held at end of period	2,867	706
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	47,765	27,428
Mortgage servicing rights, at fair value, Change included in earnings	(16,587)	2,374
Mortgage servicing rights, at fair value, Purchases and issuances	86,081	17,963
Mortgage servicing rights, at fair value, Sales and settlements	0	0
Mortgage servicing rights, at fair value, Ending Balance	117,259	47,765
Mortgage servicing rights, at fair value, Net change in unrealized gains or (losses) relating to items held at end of period	$ (13,430)	$ (2,376)