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
	Mar. 31, 2015	Mar. 31, 2014
Junior Subordinated Debentures [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Junior subordinated debentures, Beginning Balance	$ 249,294	$ 87,274
Junior subordinated debentures, Change included in earnings	3,878	1,490
Junior subordinated debentures, Purchases and issuances	0	0
Junior subordinated debentures, Sales and settlements	(2,520)	(964)
Junior subordinated debentures, Ending Balance	250,652	87,800
Junior subordinated debentures, Net change in unrealized gains or (losses) relating to items held at end of period	3,878	1,490
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	2,867	706
Interest rate lock commitment, Change included in earnings	(2,868)	(706)
Interest rate lock commitment, Purchases and issuances	19,061	4,634
Interest rate lock commitment, Sales and settlements	(12,036)	(3,240)
Interest rate lock commitment, Ending Balance	7,025	1,394
Interest rate lock commitment, Net change in unrealized gains or (losses) relating to items held at end of period	7,025	1,394
Mortgage Servicing Rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mortgage servicing rights, Beginning Balance	117,259	47,765
Mortgage servicing rights, Change included in earnings	(9,731)	(953)
Mortgage servicing rights, Purchases and issuances	8,837	2,408
Mortgage servicing rights, Sales and settlements	0	0
Mortgage servicing rights, Ending Balance	116,365	49,220
Mortgage servicing rights, Net change in unrealized gains or (losses) relating to items held at end of period	$ (7,771)	$ (394)