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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	$ 2,367	$ 3,083	$ 4,743	$ 6,973
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period	5,996	37,450	32,558	(41,412)
Junior subordinated debentures, at fair value
Beginning Balance	281,580	195,521	255,217	274,812
Change included in earnings	2,367	3,083	4,743	6,973
Change in fair values included in comprehensive income/loss	5,996	37,450	32,558	(41,412)
Purchases and issuances	0	0	0	0
Sales and settlements	(2,220)	(3,118)	(4,795)	(7,437)
Ending Balance	287,723	232,936	287,723	232,936
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	13,210	25,537	13,210	25,537
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	14,755	23,727	28,144	7,056
Change included in earnings	2,356	2,529	(1,102)	7,223
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	21,548	48,007	51,723	75,008
Sales and settlements	(25,449)	(48,726)	(65,555)	(63,750)
Ending Balance	13,210	25,537	13,210	25,537
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	(1,678)	(6,395)	(3,692)	(31,753)
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	100,413	94,346	92,907	115,010
Change included in earnings	(6,044)	(11,437)	(12,603)	(42,124)
Change in fair values included in comprehensive income/loss	0	0	0	0
Purchases and issuances	8,330	13,447	22,395	23,470
Sales and settlements	0	0	0	0
Ending balance	$ 102,699	$ 96,356	$ 102,699	$ 96,356