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 [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mortgage servicing rights, Beginning Balance			$ 117,259	$ 47,765
Mortgage servicing rights, Change included in earnings			(20,257)	(8,393)
Mortgage servicing rights, Purchases and issuances			27,812	79,353
Mortgage servicing rights, Sales and settlements			0	0
Mortgage servicing rights, Ending Balance	$ 124,814	$ 118,725	124,814	118,725
Mortgage servicing rights, Net change in unrealized gains or (losses) relating to items held at end of period			(15,072)	(6,424)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Interest rate lock commitment, Beginning Balance			2,867	706
Interest rate lock commitment, Change included in earnings			(2,321)	(868)
Interest rate lock commitment, Ending Balance	5,466	2,180	5,466	2,180
Junior Subordinated Debentures [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Junior subordinated debentures, Beginning Balance	252,214	246,077	249,294	87,274
Junior subordinated debentures, Change included in earnings	4,011	3,745	11,846	8,512
Junior subordinated debentures, Purchases and issuances	0	0	0	156,840
Junior subordinated debentures, Sales and settlements	(2,560)	(2,294)	(7,475)	(5,098)
Junior subordinated debentures, Ending Balance	253,665	247,528	253,665	247,528
Junior subordinated debentures, Net change in unrealized gains or (losses) relating to items held at end of period	4,011	3,745	11,846	8,512
Interest Rate Lock Commitments [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Interest rate lock commitment, Beginning Balance	4,061	4,405
Interest rate lock commitment, Change included in earnings	1,327	3,250
Interest rate lock commitment, Purchases and issuances	12,040	1,929	42,705	18,106
Interest rate lock commitment, Sales and settlements	(11,962)	(7,404)	(37,785)	(15,764)
Interest rate lock commitment, Ending Balance	5,466	2,180	5,466	2,180
Interest rate lock commitment, Net change in unrealized gains or (losses) relating to items held at end of period	5,466	2,180	5,466	2,180
Mortgage Servicing Rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mortgage servicing rights, Beginning Balance	127,206	114,192
Mortgage servicing rights, Change included in earnings	(10,103)	(4,280)
Mortgage servicing rights, Purchases and issuances	7,711	8,813
Mortgage servicing rights, Sales and settlements	0	0
Mortgage servicing rights, Ending Balance	124,814	118,725	$ 124,814	$ 118,725
Mortgage servicing rights, Net change in unrealized gains or (losses) relating to items held at end of period	$ (8,757)	$ (3,554)