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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
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 and liabilities held at end of period	$ (3,137)	$ (2,367)	$ (5,593)	$ (4,743)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	(15,064)	(5,996)	(27,767)	(32,558)
Junior subordinated debentures, at fair value
Beginning Balance	(305,719)	(281,580)	(293,081)	(255,217)
Change included in earnings	(3,137)	(2,367)	(5,593)	(4,743)
Change in fair values included in comprehensive income/loss	(15,064)	(5,996)	(27,767)	(32,558)
Purchases and issuances	0	0	0	0
Sales and settlements	2,652	2,220	5,173	4,795
Ending Balance	(321,268)	(287,723)	(321,268)	(287,723)
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 and liabilities held at end of period	(117)	13,210	(117)	13,210
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	0	0	0	0
Interest rate lock commitments, net
Beginning Balance	(853)	14,755	4,641	28,144
Change included in earnings	(2,437)	2,356	(6,707)	(1,102)
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	3,047	21,548	7,698	51,723
Sales and settlements	126	(25,449)	(5,749)	(65,555)
Ending Balance	(117)	13,210	(117)	13,210
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 and liabilities held at end of period	10,899	(1,678)	51,048	(3,692)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	0	0	0	0
Residential mortgage servicing rights
Beginning balance	165,807	100,413	123,615	92,907
Change included in earnings	5,938	(6,044)	40,740	(12,603)
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	7,813	8,330	15,203	22,395
Sales and settlements	0	0	0	0
Ending balance	$ 179,558	$ 102,699	$ 179,558	$ 102,699