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, 2021	Dec. 31, 2020
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	$ 9,434	$ 11,962
Change in unrealized gains or losses for the period included in other comprehensive income for assets held at end of period	37,899	(18,842)
Junior subordinated debentures, at fair value
Beginning Balance	255,217	274,812
Change included in earnings	9,434	11,962
Change in fair values included in comprehensive income/loss	37,899	(18,842)
Purchases and issuances	0	0
Sales and settlements	(9,469)	(12,715)
Ending Balance	293,081	255,217
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	4,641	28,144
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	28,144	7,056
Change included in earnings	79	15,370
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	76,940	176,267
Sales and settlements	(100,522)	(170,549)
Ending Balance	4,641	28,144
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	11,089	(53,423)
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	92,907	115,010
Change included in earnings	(7,814)	(73,103)
Change in fair values included in comprehensive income/loss	0	0
Purchases and issuances	38,522	51,000
Sales and settlements	0	0
Ending balance	$ 123,615	$ 92,907