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Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities $ 8,774,280 $ 9,649,203
Trading securities 18,269 22,225
Non-marketable securities 100,758 99,558
Total investment securities 8,893,307 9,770,986
U.S. government and federal agency obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 917,147 920,904
US Government-sponsored Enterprise Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 406,363 449,998
State and municipal obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 1,611,366 1,778,214
Agency mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 3,040,913 2,685,931
Non-agency mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 905,793 1,055,639
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 1,492,800 2,381,301
Other Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities 351,060 325,953
Equity securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities $ 48,838 $ 51,263