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Investment Securities (Summary Of Available For Sale Investment Securities By Maturity Groupings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Investment [Line Items]    
Amortized Cost $ 9,600,330 $ 9,691,414
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
Fair Value $ 920,904 727,076
Weighted Average Yield [1] 1.24%  
U.S. Government And Federal Agency Obligations [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost $ 59,407  
Fair Value $ 59,989  
Weighted Average Yield [1] 1.89%  
U.S. Government And Federal Agency Obligations [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 501,141  
Fair Value $ 506,131  
Weighted Average Yield [1] 1.33%  
U.S. Government And Federal Agency Obligations [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 286,939  
Fair Value $ 287,396  
Weighted Average Yield [1] 1.29%  
U.S. Government And Federal Agency Obligations [Member] | Maturity After 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 72,417  
Fair Value $ 67,388  
Weighted Average Yield [1] (0.10%)  
US Government-sponsored Enterprise Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost $ 450,448 794,912
Fair Value $ 449,998 793,023
Weighted Average Yield 1.56%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost $ 6,990  
Fair Value $ 7,003  
Weighted Average Yield 1.13%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 419,174  
Fair Value $ 418,662  
Weighted Average Yield 1.53%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 14,989  
Fair Value $ 15,032  
Weighted Average Yield 2.30%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 9,295  
Fair Value $ 9,301  
Weighted Average Yield 2.25%  
State and municipal obligations [Member]    
Investment [Line Items]    
Amortized Cost $ 1,778,684 1,706,635
Fair Value $ 1,778,214 1,741,957
Weighted Average Yield 2.40%  
State and municipal obligations [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost $ 195,581  
Fair Value $ 197,041  
Weighted Average Yield 2.64%  
State and municipal obligations [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 592,883  
Fair Value $ 597,391  
Weighted Average Yield 2.29%  
State and municipal obligations [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 923,792  
Fair Value $ 919,725  
Weighted Average Yield 2.40%  
State and municipal obligations [Member] | Maturity After 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 66,428  
Fair Value $ 64,057  
Weighted Average Yield 2.84%  
Agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost $ 2,674,964 2,579,031
Fair Value $ 2,685,931 2,618,281
Weighted Average Yield 2.53%  
Non-agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost $ 1,054,446 879,186
Fair Value $ 1,055,639 879,963
Weighted Average Yield 2.40%  
Asset-backed Securities [Member]    
Investment [Line Items]    
Amortized Cost $ 2,389,176 2,660,201
Fair Value $ 2,381,301 2,644,381
Weighted Average Yield 1.57%  
Total mortgage and asset-backed securities [Member]    
Investment [Line Items]    
Amortized Cost $ 6,118,586 6,118,418
Fair Value $ 6,122,871 6,142,625
Weighted Average Yield 2.14%  
Other Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost $ 327,030 335,925
Fair Value 325,953 331,320
Other Debt Securities [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost 8,998  
Fair Value 9,015  
Other Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost 100,557  
Fair Value 100,601  
Other Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost 205,887  
Fair Value 205,200  
Other Debt Securities [Member] | Maturity After 10 Years [Member]    
Investment [Line Items]    
Amortized Cost 11,588  
Fair Value 11,137  
Equity securities [Member]    
Investment [Line Items]    
Amortized Cost 5,678 5,678
Fair Value $ 51,263 $ 41,003
[1] Rate does not reflect inflation adjustment on inflation-protected securities