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Investments (Maturity Information) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Investment securities available for sale    
Total investment securities available for sale, cost $ 4,362,725 $ 4,607,117
Total investment securities available for sale, fair value 4,366,041 4,557,110
Investment securities held to maturity    
Maturing in one year or less, cost 34,550 0
Maturing in one year or less, fair value 34,550 0
Maturing in one through five years, cost 998 0
Maturing in one through five years, fair value 998 0
Investment securities held to maturity 2,218,048 2,184,653
Fair Value 2,285,283 2,201,502
Debt Securities    
Investment securities available for sale    
Maturing in one year or less, cost 897,407 1,049,253
Maturing in one through five years, cost 54,935 205,526
Maturing in five through ten years, cost 138,484 134,370
Maturing in over ten years, cost 3,934 3,923
Maturing in one year or less, fair value 898,632 1,047,380
Maturing in one through five years, fair value 55,320 205,805
Maturing in five through ten yeas, fair value 139,462 133,626
Maturing in over ten years, fair value 4,125 4,125
Agency Securities    
Investment securities available for sale    
Total investment securities available for sale, cost 533,269 257,252
Total investment securities available for sale, fair value 534,804 256,835
Mortgage Backed Securities    
Investment securities available for sale    
Total investment securities available for sale, cost 2,734,696 2,956,793
Total investment securities available for sale, fair value 2,733,698 2,909,339
Investment securities held to maturity    
Investment securities held to maturity 2,182,500 2,184,653
Mortgage-backed securities 2,249,735 2,201,502
Fair Value $ 2,249,735 $ 2,201,502