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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Junior Subordinated Debentures
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	$ (29,045)	$ (15,715)
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	7,866	(28,842)
Junior subordinated debentures, at fair value
Beginning Balance	(323,639)	(293,081)
Change included in earnings	(29,045)	(15,715)
Change in fair values included in comprehensive income/loss	7,866	(28,842)
Purchases and issuances	0	0
Sales and settlements	28,378	13,999
Ending Balance	(316,440)	(323,639)
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	(137)	32
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	32	4,641
Change included in earnings	(234)	(7,342)
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	(1,029)	10,103
Sales and settlements	1,094	(7,370)
Ending Balance	(137)	32
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	(6,122)	57,537
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	185,017	123,615
Change included in earnings	(23,816)	37,265
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	5,347	24,137
Sales and settlements	(57,305)	0
Ending balance	$ 109,243	$ 185,017