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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mortgage servicing rights, beginning balance			$ 131,817	$ 117,259
Mortgage servicing rights, change included in earnings			(34,565)	(10,154)
Mortgage servicing rights, purchases and issuances			14,843	20,101
Mortgage servicing rights, sales and settlements			0	0
Mortgage servicing rights, ending balance	$ 112,095	$ 127,206	112,095	127,206
Mortgage servicing rights, net change in unrealized gains or (losses) relating to items held at end of period			(31,961)	(6,315)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Interest rate lock commitment, beginning balance			3,631	2,867
Interest rate lock commitment, change included in earnings			3,721	(3,648)
Interest rate lock commitment, ending balance	11,028	4,061	11,028	4,061
Junior Subordinated Debentures
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Junior subordinated debentures, beginning balance	256,917	250,652	255,457	249,294
Junior subordinated debentures, change included in earnings	4,380	3,957	8,674	7,835
Junior subordinated debentures, purchases and issuances	0	0	0	0
Junior subordinated debentures, sales and settlements	(2,637)	(2,395)	(5,471)	(4,915)
Junior subordinated debentures, ending balance	258,660	252,214	258,660	252,214
Junior subordinated debentures, net change in unrealized gains or (losses) relating to items held at end of period	4,380	3,957	8,674	7,835
Interest Rate Lock Commitments
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Interest rate lock commitment, beginning balance	8,255	7,025
Interest rate lock commitment, change included in earnings	1,677	(781)
Interest rate lock commitment, purchases and issuances	16,319	11,604	31,282	30,665
Interest rate lock commitment, sales and settlements	(15,223)	(13,787)	(27,606)	(25,823)
Interest rate lock commitment, ending balance	11,028	4,061	11,028	4,061
Interest rate lock commitment, net change in unrealized gains or (losses) relating to items held at end of period	11,028	4,061	11,028	4,061
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Mortgage servicing rights, beginning balance	117,172	116,365
Mortgage servicing rights, change included in earnings	(13,940)	(423)
Mortgage servicing rights, purchases and issuances	8,863	11,264
Mortgage servicing rights, sales and settlements	0	0
Mortgage servicing rights, ending balance	112,095	127,206	$ 112,095	$ 127,206
Mortgage servicing rights, net change in unrealized gains or (losses) relating to items held at end of period	$ (12,134)	$ 1,456