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Investment Securities (Details 2) - USD ($)
shares in Thousands
Sep. 30, 2019
Dec. 31, 2018
Available-for-sale securities, fair value $ 4,431,700 $ 4,580,610
U.S. Government agency securities [Member]    
Available-for-sale securities, greater than 12 months, fair value 747,000 2,277,000
Available-for-sale securities, greater than 12 months, gross unrealized losses 2,000 72,000
Available-for-sale securities, less than 12 months, fair value 749,000 0
Available-for-sale securities, less than 12 months, gross unrealized losses 1,000 0
Available-for-sale securities, fair value 1,496,000 2,277,000
Available-for-sale securities, gross unrealized losses $ 3,000 $ 72,000
Number of Securities 4 7
Other Debt Obligations [Member]    
Available-for-sale securities, greater than 12 months, fair value $ 747,000 $ 3,576,000
Available-for-sale securities, greater than 12 months, gross unrealized losses 2,000 116,000
Available-for-sale securities, less than 12 months, fair value 1,240,000 718,000
Available-for-sale securities, less than 12 months, gross unrealized losses 4,000 10,000
Available-for-sale securities, fair value 1,987,000 4,294,000
Available-for-sale securities, gross unrealized losses $ 6,000 $ 126,000
Number of Securities 7 21
Mortgages-backed Securities [Member]    
Available-for-sale securities, greater than 12 months, fair value $ 0 $ 1,299,000
Available-for-sale securities, greater than 12 months, gross unrealized losses 0 44,000
Available-for-sale securities, less than 12 months, fair value 491,000 718,000
Available-for-sale securities, less than 12 months, gross unrealized losses 3,000 10,000
Available-for-sale securities, fair value 491,000 2,017,000
Available-for-sale securities, gross unrealized losses $ 3,000 $ 54,000
Number of Securities 3 14