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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
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	$ 2,344	$ 2,536	$ 7,087	$ 9,509
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	11,946	14,555	44,504	(26,857)
Junior subordinated debentures, at fair value
Beginning Balance	287,723	232,936	255,217	274,812
Change included in earnings	2,344	2,536	7,087	9,509
Change in fair values included in comprehensive income/loss	11,946	14,555	44,504	(26,857)
Purchases and issuances	0	0	0	0
Sales and settlements	(2,505)	(2,982)	(7,300)	(10,419)
Ending Balance	299,508	247,045	299,508	247,045
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	8,258	28,839	8,258	28,839
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	13,210	25,537	28,144	7,056
Change included in earnings	1,301	3,723	199	10,946
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	16,007	55,854	67,730	130,862
Sales and settlements	(22,260)	(56,275)	(87,815)	(120,025)
Ending Balance	8,258	28,839	8,258	28,839
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	(634)	(12,244)	(4,326)	(43,997)
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	102,699	96,356	92,907	115,010
Change included in earnings	(5,315)	(17,122)	(17,918)	(59,246)
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	8,450	14,014	30,845	37,484
Sales and settlements	0	0	0	0
Ending balance	$ 105,834	$ 93,248	$ 105,834	$ 93,248