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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 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	$ (7,603)	$ (4,348)	$ (21,331)	$ (9,941)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	(19,677)	(4,043)	(8,503)	(31,810)
Junior subordinated debentures, at fair value
Beginning Balance	(312,872)	(321,268)	(323,639)	(293,081)
Change included in earnings	(7,603)	(4,348)	(21,331)	(9,941)
Change in fair values included in comprehensive income/loss	(19,677)	(4,043)	(8,503)	(31,810)
Purchases and issuances	0	0	0	0
Sales and settlements	8,607	3,915	21,928	9,088
Ending Balance	(331,545)	(325,744)	(331,545)	(325,744)
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	(427)	(2,266)	(427)	(2,266)
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	(51)	(117)	32	4,641
Change included in earnings	(122)	(1,072)	(288)	(7,779)
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	(685)	1,376	(663)	9,074
Sales and settlements	431	(2,453)	492	(8,202)
Ending Balance	(427)	(2,266)	(427)	(2,266)
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	5,308	16,403	129	67,451
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	172,929	179,558	185,017	123,615
Change included in earnings	507	11,425	(14,350)	52,165
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	1,658	5,194	4,427	20,397
Sales and settlements	(57,454)	0	(57,454)	0
Ending balance	$ 117,640	$ 196,177	$ 117,640	$ 196,177