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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 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	$ 2,536	$ 4,495	$ 9,509	$ 13,952
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	14,555	(8,450)	(26,857)	(32,254)
Junior subordinated debentures, at fair value
Beginning Balance	232,936	277,028	274,812	300,870
Transfer Out of Level 3	0	0	0	0
Change included in earnings	2,536	4,495	9,509	13,952
Change in fair values included in comprehensive income/loss	14,555	(8,450)	(26,857)	(32,254)
Purchases and issuances	0	0	0	0
Sales and settlements	(2,982)	(5,275)	(10,419)	(14,770)
Ending Balance	247,045	267,798	247,045	267,798
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	28,839	9,070	28,839	9,070
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	0	0	0	0
Interest rate lock commitments, net
Beginning Balance	25,537	8,149	7,056	6,757
Transfer out of level 3	0	0	0	0
Change included in earnings	3,723	1,456	10,946	4,455
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	55,854	9,027	130,862	21,318
Sales and settlements	(56,275)	(9,562)	(120,025)	(23,460)
Ending Balance	28,839	9,070	28,839	9,070
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	(12,244)	11,045	(43,997)	(14,243)
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	0	0	0	0
Residential mortgage servicing rights
Beginning balance	96,356	139,780	115,010	169,025
Transfer out of level 3	0	(36,191)	0	(36,191)
Change included in earnings	(17,122)	4,210	(59,246)	(34,414)
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	14,014	7,393	37,484	16,772
Sales and settlements	0	0	0	0
Ending balance	$ 93,248	$ 115,192	$ 93,248	$ 115,192