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Investments (Maturity Information) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investment securities available for sale    
Total investment securities available for sale, cost $ 4,765,832 $ 7,229,014
Total investment securities available for sale, fair value 4,677,351 7,180,180
Investment securities held to maturity    
Investment securities held to maturity 2,253,416 76
Debt Securities    
Investment securities available for sale    
Maturing in one year or less, cost 1,260,166 808,768
Maturing in one through five years, cost 249,267 849,642
Maturing in five through ten years, cost 119,717 59,414
Maturing in over ten years, cost 4,552 7,645
Maturing in one year or less, fair value 1,256,660 808,301
Maturing in one through five years, fair value 248,775 849,563
Maturing in five through ten yeas, fair value 119,932 59,963
Maturing in over ten years, fair value 4,643 7,719
Government agency    
Investment securities available for sale    
Total investment securities available for sale, cost 127,911 8,695
Total investment securities available for sale, fair value 127,545 8,670
Mortgage Backed Securities    
Investment securities available for sale    
Total investment securities available for sale, cost 3,004,219 5,419,379
Total investment securities available for sale, fair value 2,919,796 5,340,756
Investment securities held to maturity    
Investment securities held to maturity 2,253,416 76
Fair Value 2,238,664 81
Equity Securities    
Investment securities available for sale    
Total investment securities available for sale, cost 0 75,471
Total investment securities available for sale, fair value $ 0 $ 105,208