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
	Mar. 31, 2023	Mar. 31, 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	$ (6,679)	$ (2,456)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	25,812	(12,703)
Junior subordinated debentures, at fair value
Beginning Balance	(323,639)	(293,081)
Change included in earnings	(6,679)	(2,456)
Change in fair values included in comprehensive income/loss	25,812	(12,703)
Purchases and issuances	0	0
Sales and settlements	6,785	2,521
Ending Balance	(297,721)	(305,719)
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	137	(853)
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
Interest rate lock commitments, net
Beginning Balance	32	4,641
Change included in earnings	(32)	(4,270)
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	338	4,651
Sales and settlements	(201)	(5,875)
Ending Balance	137	(853)
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	(2,937)	40,149
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
Residential mortgage servicing rights
Beginning balance	185,017	123,615
Change included in earnings	(7,818)	34,802
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	1,601	7,390
Sales and settlements	0	0
Ending balance	$ 178,800	$ 165,807