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Investment Securities (Investment Securities, At Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investment Securities [Abstract]    
Available-for-sale Securities, Debt Securities $ 8,412,376 $ 8,725,442
Trading securities 31,156 18,269
Equity securities with a readily determinable fair value 2,741 48,838
Equtiy Securities without Readily Determinable Fair Values 1,703 1,753
Federal Reserve Bank Stock 33,369 33,253
Federal Home Loan Bank Stock 10,000 10,000
Private equity investments 68,940 55,752
Total investment securities $ 8,560,285 $ 8,893,307