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Investment Securities (Amortized Cost And Fair Value Of Investment Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale, Amortized cost [Abstract]
Due before one year	$ 2,367
Due after one year through five years	54,439
Due after five years through ten years	277,018
Due after ten years	969,226
Amortized cost	1,303,050
Available-for-sale, Fair value [Abstract]
Due before one year	2,360
Due after one year through five years	54,034
Due after five years through ten years	267,347
Due after ten years	950,676
Fair value	1,274,417	$ 1,294,484
Held-to-maturity, Amortized cost [Abstract]
Due after ten years	84,433
Amortized cost	84,433	86,380
Held-to-maturity, Fair value [Abstract]
Due after ten years	83,751
Fair value	$ 83,751	$ 85,345

X

- 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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