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Investments (Maturity Information) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investment securities available for sale    
Total investment securities available for sale, cost $ 4,858,178 $ 7,229,014
Total investment securities available for sale, fair value 4,783,507 7,180,180
Investment securities held to maturity    
Investment securities held to maturity 2,299,774 76
Debt Securities    
Investment securities available for sale    
Maturing in one year or less, cost 1,255,746 808,768
Maturing in one through five years, cost 252,689 849,642
Maturing in five through ten years, cost 108,649 59,414
Maturing in over ten years, cost 5,545 7,645
Maturing in one year or less, fair value 1,252,487 808,301
Maturing in one through five years, fair value 251,487 849,563
Maturing in five through ten yeas, fair value 108,790 59,963
Maturing in over ten years, fair value 5,643 7,719
Mortgage Backed Securities    
Investment securities available for sale    
Total investment securities available for sale, cost 3,104,316 5,419,379
Total investment securities available for sale, fair value 3,034,065 5,340,756
Investment securities held to maturity    
Investment securities held to maturity 2,299,774 76
Fair Value 2,302,093 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