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Investments (Maturity Information) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investment securities available for sale    
Total investment securities available for sale, cost $ 4,898,771 $ 4,607,117
Total investment securities available for sale, fair value 4,904,883 4,557,110
Investment securities held to maturity    
Maturing in one year or less, cost 30,552 0
Maturing in one year or less, fair value 30,552 0
Maturing in one through five years, cost 250 0
Maturing in one through five years, fair value 250 0
Investment securities held to maturity 2,145,943 2,184,653
Fair Value 2,217,800 2,201,502
Debt Securities    
Investment securities available for sale    
Maturing in one year or less, cost 748,206 1,049,253
Maturing in one through five years, cost 13,364 205,526
Maturing in five through ten years, cost 137,638 134,370
Maturing in over ten years, cost 3,941 3,923
Maturing in one year or less, fair value 749,318 1,047,380
Maturing in one through five years, fair value 13,795 205,805
Maturing in five through ten yeas, fair value 139,430 133,626
Maturing in over ten years, fair value 4,100 4,125
Agency Securities    
Investment securities available for sale    
Total investment securities available for sale, cost 666,029 257,252
Total investment securities available for sale, fair value 665,621 256,835
Mortgage-backed securities    
Investment securities available for sale    
Total investment securities available for sale, cost 3,329,593 2,956,793
Total investment securities available for sale, fair value 3,332,619 2,909,339
Investment securities held to maturity    
Investment securities held to maturity 2,115,141 2,184,653
Mortgage-backed securities 2,186,998 2,201,502
Fair Value $ 2,186,998 $ 2,201,502