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Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Due within one year, Amortized Cost	$ 95,802
Due after one year through five years, Amortized Cost	438,632
Due after five years through ten years, Amortized Cost	1,315,811
Due after ten years, Amortized Cost	965,758
Debt securities available-for-sale, amortized cost	2,816,003	$ 3,210,615
Due within one year, Fair Value	95,869
Due after one year through five years, Fair Value	441,541
Due after five years through ten years, Fair Value	1,361,873
Due after ten years, Fair Value	965,135
Debt securities available-for-sale, Fair Value	$ 2,864,418	$ 3,167,448

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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