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Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investment [Line Items]    
Amortized Cost $ 8,719,867 $ 9,600,330
Available For Sale Securities, Gross Unreailzed Gain at Period End 98,535 109,815
Available For Sale Securities, Gross Unrealized Loss at Period End (44,122) (60,942)
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
Available For Sale Securities, Gross Unreailzed Gain at Period End 4,096 7,312
Available For Sale Securities, Gross Unrealized Loss at Period End (4,443) (6,312)
Fair Value 917,147 920,904
US Government-sponsored Enterprise Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost 408,266 450,448
Available For Sale Securities, Gross Unreailzed Gain at Period End 26 1,126
Available For Sale Securities, Gross Unrealized Loss at Period End (1,929) (1,576)
Fair Value 406,363 449,998
State and municipal obligations [Member]    
Investment [Line Items]    
Amortized Cost 1,592,707 1,778,684
Available For Sale Securities, Gross Unreailzed Gain at Period End 21,413 12,223
Available For Sale Securities, Gross Unrealized Loss at Period End (2,754) (12,693)
Fair Value 1,611,366 1,778,214
Agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost 3,046,701 2,674,964
Available For Sale Securities, Gross Unreailzed Gain at Period End 17,956 31,610
Available For Sale Securities, Gross Unrealized Loss at Period End (23,744) (20,643)
Fair Value 3,040,913 2,685,931
Non-agency mortgage-backed securities [Member]    
Investment [Line Items]    
Amortized Cost 903,920 1,054,446
Available For Sale Securities, Gross Unreailzed Gain at Period End 6,710 7,686
Available For Sale Securities, Gross Unrealized Loss at Period End (4,837) (6,493)
Fair Value 905,793 1,055,639
Asset-backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 1,495,380 2,389,176
Available For Sale Securities, Gross Unreailzed Gain at Period End 2,657 3,338
Available For Sale Securities, Gross Unrealized Loss at Period End (5,237) (11,213)
Fair Value 1,492,800 2,381,301
Total mortgage and asset-backed securities [Member]    
Investment [Line Items]    
Amortized Cost 5,446,001 6,118,586
Available For Sale Securities, Gross Unreailzed Gain at Period End 27,323 42,634
Available For Sale Securities, Gross Unrealized Loss at Period End (33,818) (38,349)
Fair Value 5,439,506 6,122,871
Other Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost 350,988 327,030
Available For Sale Securities, Gross Unreailzed Gain at Period End 1,250 935
Available For Sale Securities, Gross Unrealized Loss at Period End (1,178) (2,012)
Fair Value 351,060 325,953
Equity securities [Member]    
Investment [Line Items]    
Amortized Cost 4,411 5,678
Available For Sale Securities, Gross Unreailzed Gain at Period End 44,427 45,585
Available For Sale Securities, Gross Unrealized Loss at Period End 0 0
Fair Value $ 48,838 $ 51,263