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Securities (Amortized Cost and Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]
Debt Securities Available for Sale, Due in one year or less, Amortized Cost	$ 356
Debt Securities Available for Sale, Due after one year through five years, Amortized Cost	151,871
Debt Securities Available for Sale, Due after five years through ten years, Amortized Cost	1,764,275
Debt Securities Available for Sale, Due after ten years, Amortized Cost	2,721,108
Total available for sale debt securities, Amortized Cost	4,637,610
Debt Securities Available for Sale, Due in one year or less, Fair Value	363
Debt Securities Available for Sale, Due after one year through five years, Fair Value	154,646
Debt Securities Available for Sale, Due after five years through ten years, Fair Value	1,778,398
Debt Securities Available for Sale, Due after ten years, Fair Value	2,741,897
Total available for sale debt securities, Fair Value	4,675,304
Debt Securities Held to Maturity, Due in one year or less, Amortized Cost	50,000
Debt Securities Held to Maturity, Due after one year through five years, Amortized Cost	140,009
Debt Securities Held to Maturity, Due after five years through ten years, Amortized Cost	672,094
Debt Securities Held to Maturity, Due after ten years, Amortized Cost	705,906
Total held to maturity debt securities, Amortized Cost	1,568,009	$ 2,979,547
Debt Securities Held to Maturity, Due in one year or less, Fair Value	50,003
Debt Securities Held to Maturity, Due after one year through five years, Fair Value	141,929
Debt Securities Held to Maturity, Due after five years through ten years, Fair Value	694,992
Debt Securities Held to Maturity, Due after ten years, Fair Value	724,080
Total held to maturity debt securities, Fair Value	$ 1,611,004	$ 2,935,856

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