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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands

Dec. 31, 2018

Dec. 31, 2017

Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]

Available-for-sale Securities, debt maturities, Amortized Cost

$ 3,125,574

Available-for-sale Securities, debt maturities, within one year, Fair Value

^[1]

5,855

Available-for-sale Securities, debt maturities, after five through ten years, fair value

^[1]

458,442

Availably-for-sale Securities, debt maturities, after ten years, Fair Value

^[1]

1,980,827

Available-for-sale Securities, debt maturities, Fair Value

^[1]

3,070,447

Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost

536,717

Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost

3,630,613

Held-to-maturity Securities, Amortized cost

^[2]

4,218,854

$ 3,698,098

Held-to-maturity Securities, debt maturities, Fair Value

^[2]

4,122,907

$ 3,710,478

Excluding Mortgage Backed Securities [Member]

Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]

Available-for-sale Securities, debt maturities, within one year, Amortized Cost

5,872

Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost

233,969

Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost

406,184

Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost

463,765

Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost

1,705,836

Available-for-sale Securities, debt maturities, within one year, Fair Value

5,855

Available-for-sale Securities, debt maturities, after one year through three years, Fair Value

227,818

Available-for-sale Securities, debt maturities, after three year through five years, Fair Value

396,046

Available-for-sale Securities, debt maturities, after five through ten years, fair value

452,622

Availably-for-sale Securities, debt maturities, after ten years, Fair Value

1,686,764

Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost

366,667

Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost

2,602,221

Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value

364,758

Held-to-maturity Securities, debt maturities, after ten years, Fair Value

2,538,380

Mortgage Backed Securities [Member]

Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]

Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost

132

Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost

1,323

Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost

5,801

Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost

302,692

Available-for-sale Securities, debt maturities, after one year through three years, Fair Value

133

Available-for-sale Securities, debt maturities, after three year through five years, Fair Value

1,326

Available-for-sale Securities, debt maturities, after five through ten years, fair value

5,820

Availably-for-sale Securities, debt maturities, after ten years, Fair Value

294,063

Held-to-maturity Securities, debt maturities, after one year through three years, Amortized Cost

51,524

Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost

170,050

Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost

1,028,392

Held-to-maturity Securities, debt maturities, after one year through three years, Fair Value

51,709

Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value

165,858

Held-to-maturity Securities, debt maturities, after ten years, Fair Value

$ 1,002,202

[1]	Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[2]	Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.

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