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 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Junior subordinated debentures, at fair value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Change in unrealized gains or losses for the period included in earnings for assets held at end of period	$ 3,890	$ 4,772
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	(78,862)	(6,564)
Junior subordinated debentures, at fair value
Beginning Balance	274,812	300,870
Change included in earnings	3,890	4,772
Change in fair values included in comprehensive income/loss	(78,862)	(6,564)
Purchases and issuances	0	0
Sales and settlements	(4,319)	(4,957)
Ending Balance	195,521	294,121
Interest rate lock commitments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Change in unrealized gains or losses for the period included in earnings for assets held at end of period	23,727	8,174
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	0	0
Interest rate lock commitments, net
Beginning Balance	7,056	6,757
Change included in earnings	4,694	1,697
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	27,001	5,399
Sales and settlements	(15,024)	(5,679)
Ending Balance	23,727	8,174
Residential mortgage servicing rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Change in unrealized gains or losses for the period included in earnings for assets held at end of period	(25,358)	(7,535)
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	0	0
Residential mortgage servicing rights
Beginning Balance	115,010	169,025
Change included in earnings	(30,687)	(13,966)
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	10,023	3,887
Sales and settlements	0	0
Ending Balance	$ 94,346	$ 158,946