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Investments (Maturity Information) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Investment securities available for sale    
Total investment securities available for sale, cost $ 4,611,736 $ 4,607,117
Total investment securities available for sale, fair value 4,589,800 4,557,110
Investment securities held to maturity    
Investment securities held to maturity 2,214,829 2,184,653
Debt Securities    
Investment securities available for sale    
Maturing in one year or less, cost 1,046,796 1,049,253
Maturing in one through five years, cost 155,297 205,526
Maturing in five through ten years, cost 137,430 134,370
Maturing in over ten years, cost 3,929 3,923
Maturing in one year or less, fair value 1,046,362 1,047,380
Maturing in one through five years, fair value 155,680 205,805
Maturing in five through ten yeas, fair value 137,162 133,626
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 351,284 257,252
Total investment securities available for sale, fair value 350,527 256,835
Mortgage Backed Securities    
Investment securities available for sale    
Total investment securities available for sale, cost 2,917,000 2,956,793
Total investment securities available for sale, fair value 2,895,944 2,909,339
Investment securities held to maturity    
Investment securities held to maturity 2,214,829 2,184,653
Fair Value $ 2,254,924 $ 2,201,502