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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, 2017
Dec. 31, 2016
Investment [Line Items]    
Amortized Cost $ 8,719,867 $ 9,600,330
Fair Value 8,774,280 9,649,203
U.S. Government And Federal Agency Obligations [Member]    
Investment [Line Items]    
Amortized Cost 917,494 919,904
Fair Value $ 917,147 920,904
Weighted Average Yield [1] 1.24%  
U.S. Government And Federal Agency Obligations [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost $ 57,983  
Fair Value $ 58,347  
Weighted Average Yield [1] 1.71%  
U.S. Government And Federal Agency Obligations [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 641,114  
Fair Value $ 639,192  
Weighted Average Yield [1] 1.45%  
U.S. Government And Federal Agency Obligations [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 149,589  
Fair Value $ 149,927  
Weighted Average Yield [1] 0.43%  
U.S. Government And Federal Agency Obligations [Member] | Maturity After 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 68,808  
Fair Value $ 69,681  
Weighted Average Yield [1] 0.59%  
US Government-sponsored Enterprise Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost $ 408,266 450,448
Fair Value $ 406,363 449,998
Weighted Average Yield 1.79%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost $ 215,763  
Fair Value $ 215,434  
Weighted Average Yield 1.35%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 121,575  
Fair Value $ 121,199  
Weighted Average Yield 1.93%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 34,983  
Fair Value $ 34,870  
Weighted Average Yield 2.71%  
US Government-sponsored Enterprise Debt Securities [Member] | Maturity After 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 35,945  
Fair Value $ 34,860  
Weighted Average Yield 3.00%  
State and municipal obligations [Member]    
Investment [Line Items]    
Amortized Cost $ 1,592,707 1,778,684
Fair Value $ 1,611,366 1,778,214
Weighted Average Yield 2.39%  
State and municipal obligations [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost $ 164,756  
Fair Value $ 165,638  
Weighted Average Yield 2.65%  
State and municipal obligations [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 665,351  
Fair Value $ 670,953  
Weighted Average Yield 2.21%  
State and municipal obligations [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 709,248  
Fair Value $ 721,181  
Weighted Average Yield 2.46%  
State and municipal obligations [Member] | Maturity After 10 Years [Member]    
Investment [Line Items]    
Amortized Cost $ 53,352  
Fair Value $ 53,594  
Weighted Average Yield 3.01%  
Agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost $ 3,046,701 2,674,964
Fair Value $ 3,040,913 2,685,931
Weighted Average Yield 2.62%  
Non-agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost $ 903,920 1,054,446
Fair Value $ 905,793 1,055,639
Weighted Average Yield 2.54%  
Asset-backed Securities [Member]    
Investment [Line Items]    
Amortized Cost $ 1,495,380 2,389,176
Fair Value $ 1,492,800 2,381,301
Weighted Average Yield 2.03%  
Total mortgage and asset-backed securities [Member]    
Investment [Line Items]    
Amortized Cost $ 5,446,001 6,118,586
Fair Value $ 5,439,506 6,122,871
Weighted Average Yield 2.45%  
Other Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost $ 350,988 327,030
Fair Value 351,060 325,953
Other Debt Securities [Member] | Maturity Within 1 Year [Member]    
Investment [Line Items]    
Amortized Cost 10,390  
Fair Value 10,389  
Other Debt Securities [Member] | Maturity After 1 But Within 5 Years [Member]    
Investment [Line Items]    
Amortized Cost 247,181  
Fair Value 247,626  
Other Debt Securities [Member] | Maturity After 5 But Within 10 Years [Member]    
Investment [Line Items]    
Amortized Cost 93,417  
Fair Value 93,045  
Equity securities [Member]    
Investment [Line Items]    
Amortized Cost 4,411 5,678
Fair Value $ 48,838 $ 51,263
[1] Rate does not reflect inflation adjustment on inflation-protected securities