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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
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	$ (7,049)	$ (3,137)	$ (13,728)	$ (5,593)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	(14,638)	(15,064)	11,174	(27,767)
Junior subordinated debentures, at fair value
Beginning Balance	(297,721)	(305,719)	(323,639)	(293,081)
Change included in earnings	(7,049)	(3,137)	(13,728)	(5,593)
Change in fair values included in comprehensive income/loss	(14,638)	(15,064)	11,174	(27,767)
Purchases and issuances	0	0	0	0
Sales and settlements	6,536	2,652	13,321	5,173
Ending Balance	(312,872)	(321,268)	(312,872)	(321,268)
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	(51)	(117)	(51)	(117)
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	137	(853)	32	4,641
Change included in earnings	(134)	(2,437)	(166)	(6,707)
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	(316)	3,047	22	7,698
Sales and settlements	262	126	61	(5,749)
Ending Balance	(51)	(117)	(51)	(117)
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	(2,242)	10,899	(5,179)	51,048
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	178,800	165,807	185,017	123,615
Change included in earnings	(7,039)	5,938	(14,857)	40,740
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	1,168	7,813	2,769	15,203
Sales and settlements	0	0	0	0
Ending balance	$ 172,929	$ 179,558	$ 172,929	$ 179,558