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Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities $ 9,649,203 $ 9,777,004
Trading securities 22,225 11,890
Non-marketable securities 99,558 112,786
Total investment securities 9,770,986 9,901,680
U.S. government and federal agency obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 920,904 727,076
US Government-sponsored Enterprise Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 449,998 793,023
State and municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 1,778,214 1,741,957
Agency mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 2,685,931 2,618,281
Non-agency mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 1,055,639 879,963
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 2,381,301 2,644,381
Other Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 325,953 331,320
Equity securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities $ 51,263 $ 41,003