XML 61 R51.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investment Securities (Available For Sale Securities Unrealized Gains And Losses, By Security Type) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Investment [Line Items]    
Amortized Cost $ 8,971,612 $ 9,600,330
Available For Sale Securities, Gross Unreailzed Gain at Period End 166,027 109,815
Available For Sale Securities, Gross Unrealized Loss at Period End (28,352) (60,942)
Fair Value 9,109,287 9,649,203
U.S. Government And Federal Agency Obligations [Member]    
Investment [Line Items]    
Amortized Cost 916,224 919,904
Available For Sale Securities, Gross Unreailzed Gain at Period End 6,359 7,312
Available For Sale Securities, Gross Unrealized Loss at Period End (3,979) (6,312)
Fair Value 918,604 920,904
Government-Sponsored Enterprise Obligations [Member]    
Investment [Line Items]    
Amortized Cost 470,403 450,448
Available For Sale Securities, Gross Unreailzed Gain at Period End 844 1,126
Available For Sale Securities, Gross Unrealized Loss at Period End (1,833) (1,576)
Fair Value 469,414 449,998
State And Municipal Obligations [Member]    
Investment [Line Items]    
Amortized Cost 1,687,136 1,778,684
Available For Sale Securities, Gross Unreailzed Gain at Period End 34,952 12,223
Available For Sale Securities, Gross Unrealized Loss at Period End (1,685) (12,693)
Fair Value 1,720,403 1,778,214
Agency Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 2,741,329 2,674,964
Available For Sale Securities, Gross Unreailzed Gain at Period End 28,827 31,610
Available For Sale Securities, Gross Unrealized Loss at Period End (13,183) (20,643)
Fair Value 2,756,973 2,685,931
Non-Agency Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 1,062,079 1,054,446
Available For Sale Securities, Gross Unreailzed Gain at Period End 8,536 7,686
Available For Sale Securities, Gross Unrealized Loss at Period End (3,851) (6,493)
Fair Value 1,066,764 1,055,639
Asset-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 1,735,004 2,389,176
Available For Sale Securities, Gross Unreailzed Gain at Period End 5,047 3,338
Available For Sale Securities, Gross Unrealized Loss at Period End (3,085) (11,213)
Fair Value 1,736,966 2,381,301
Total Mortgage And Asset-Backed Securities [Member]    
Investment [Line Items]    
Amortized Cost 5,538,412 6,118,586
Available For Sale Securities, Gross Unreailzed Gain at Period End 42,410 42,634
Available For Sale Securities, Gross Unrealized Loss at Period End (20,119) (38,349)
Fair Value 5,560,703 6,122,871
Other Debt Securities [Member]    
Investment [Line Items]    
Amortized Cost 354,084 327,030
Available For Sale Securities, Gross Unreailzed Gain at Period End 3,293 935
Available For Sale Securities, Gross Unrealized Loss at Period End (736) (2,012)
Fair Value 356,641 325,953
Equity Securities [Member]    
Investment [Line Items]    
Amortized Cost 5,353 5,678
Available For Sale Securities, Gross Unreailzed Gain at Period End 78,169 45,585
Available For Sale Securities, Gross Unrealized Loss at Period End 0 0
Fair Value $ 83,522 $ 51,263