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Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Investment [Line Items]    
Amortized Cost $ 9,341,771 $ 9,600,330
Available For Sale Securities, Gross Unreailzed Gain at Period End 129,881 109,815
Available For Sale Securities, Gross Unrealized Loss at Period End (31,951) (60,942)
Fair Value 9,439,701 9,649,203
U.S. Government And Federal Agency Obligations [Member]    
Investment [Line Items]    
Amortized Cost 912,028 919,904
Available For Sale Securities, Gross Unreailzed Gain at Period End 5,575 7,312
Available For Sale Securities, Gross Unrealized Loss at Period End (5,048) (6,312)
Fair Value 912,555 920,904
Government-Sponsored Enterprise Obligations [Member]    
Investment [Line Items]    
Amortized Cost 446,864 450,448
Available For Sale Securities, Gross Unreailzed Gain at Period End 892 1,126
Available For Sale Securities, Gross Unrealized Loss at Period End (1,471) (1,576)
Fair Value 446,285 449,998
State And Municipal Obligations [Member]    
Investment [Line Items]    
Amortized Cost 1,745,068 1,778,684
Available For Sale Securities, Gross Unreailzed Gain at Period End 34,717 12,223
Available For Sale Securities, Gross Unrealized Loss at Period End (1,988) (12,693)
Fair Value 1,777,797 1,778,214
Agency Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 2,604,217 2,674,964
Available For Sale Securities, Gross Unreailzed Gain at Period End 29,780 31,610
Available For Sale Securities, Gross Unrealized Loss at Period End (13,799) (20,643)
Fair Value 2,620,198 2,685,931
Non-Agency Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 1,063,236 1,054,446
Available For Sale Securities, Gross Unreailzed Gain at Period End 8,063 7,686
Available For Sale Securities, Gross Unrealized Loss at Period End (4,410) (6,493)
Fair Value 1,066,889 1,055,639
Asset-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 2,249,399 2,389,176
Available For Sale Securities, Gross Unreailzed Gain at Period End 5,725 3,338
Available For Sale Securities, Gross Unrealized Loss at Period End (4,698) (11,213)
Fair Value 2,250,426 2,381,301
Total Mortgage And Asset-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 5,916,852 6,118,586
Available For Sale Securities, Gross Unreailzed Gain at Period End 43,568 42,634
Available For Sale Securities, Gross Unrealized Loss at Period End (22,907) (38,349)
Fair Value 5,937,513 6,122,871
Other Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost 315,496 327,030
Available For Sale Securities, Gross Unreailzed Gain at Period End 2,745 935
Available For Sale Securities, Gross Unrealized Loss at Period End (537) (2,012)
Fair Value 317,704 325,953
Equity Securities [Member]    
Investment [Line Items]    
Amortized Cost 5,463 5,678
Available For Sale Securities, Gross Unreailzed Gain at Period End 42,384 45,585
Available For Sale Securities, Gross Unrealized Loss at Period End 0 0
Fair Value $ 47,847 $ 51,263