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Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investment [Line Items]    
Amortized Cost $ 9,600,330 $ 9,691,414
Available For Sale Securities, Gross Unreailzed Gain at Period End 109,815 138,210
Available For Sale Securities, Gross Unrealized Loss at Period End (60,942) (52,620)
Fair Value 9,649,203 9,777,004
U.S. Government And Federal Agency Obligations [Member]    
Investment [Line Items]    
Amortized Cost 919,904 729,846
Available For Sale Securities, Gross Unreailzed Gain at Period End 7,312 5,051
Available For Sale Securities, Gross Unrealized Loss at Period End (6,312) (7,821)
Fair Value 920,904 727,076
US Government-sponsored Enterprise Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost 450,448 794,912
Available For Sale Securities, Gross Unreailzed Gain at Period End 1,126 2,657
Available For Sale Securities, Gross Unrealized Loss at Period End (1,576) (4,546)
Fair Value 449,998 793,023
State and municipal obligations [Member]    
Investment [Line Items]    
Amortized Cost 1,778,684 1,706,635
Available For Sale Securities, Gross Unreailzed Gain at Period End 12,223 37,061
Available For Sale Securities, Gross Unrealized Loss at Period End (12,693) (1,739)
Fair Value 1,778,214 1,741,957
Agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost 2,674,964 2,579,031
Available For Sale Securities, Gross Unreailzed Gain at Period End 31,610 47,856
Available For Sale Securities, Gross Unrealized Loss at Period End (20,643) (8,606)
Fair Value 2,685,931 2,618,281
Non-agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost 1,054,446 879,186
Available For Sale Securities, Gross Unreailzed Gain at Period End 7,686 8,596
Available For Sale Securities, Gross Unrealized Loss at Period End (6,493) (7,819)
Fair Value 1,055,639 879,963
Asset-backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 2,389,176 2,660,201
Available For Sale Securities, Gross Unreailzed Gain at Period End 3,338 1,287
Available For Sale Securities, Gross Unrealized Loss at Period End (11,213) (17,107)
Fair Value 2,381,301 2,644,381
Total mortgage and asset-backed securities [Member]    
Investment [Line Items]    
Amortized Cost 6,118,586 6,118,418
Available For Sale Securities, Gross Unreailzed Gain at Period End 42,634 57,739
Available For Sale Securities, Gross Unrealized Loss at Period End (38,349) (33,532)
Fair Value 6,122,871 6,142,625
Other Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost 327,030 335,925
Available For Sale Securities, Gross Unreailzed Gain at Period End 935 377
Available For Sale Securities, Gross Unrealized Loss at Period End (2,012) (4,982)
Fair Value 325,953 331,320
Equity securities [Member]    
Investment [Line Items]    
Amortized Cost 5,678 5,678
Available For Sale Securities, Gross Unreailzed Gain at Period End 45,585 35,325
Available For Sale Securities, Gross Unrealized Loss at Period End 0 0
Fair Value $ 51,263 $ 41,003