Securities (Schedule of Contractual Maturities of Investment Securities Available for Sale) (Details) $ in Thousands	Jun. 30, 2016 USD ($)
Available-for-sale Securities [Abstract]
Due within one year, Amortized Cost	$ 26,674
Due after one year through five years, Amortized Cost	462,009
Due after five years through ten years, Amortized Cost	698,729
Due after ten years, Amortized Cost	1,044,568
No stated maturity date, Amortized Cost Basis	5,284
Total investment securities available-for-sale, Amortized Cost	2,237,264
Due within one year, Fair Value	26,827
Due after one year through five years, Fair Value	471,463
Due after five years through ten years, Fair Value	716,521
Due after ten years, Fair Value	1,059,532
No stated maturity date, Fair Value	5,209
Total investment securities available-for-sale, Fair Value	$ 2,279,552