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

Jun. 30, 2019

Dec. 31, 2018

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

$ 2,702,416

$ 3,125,574

Available for sale securities, unrealized gains

^[1]

11,721

777

Available-for-sale Securities, Gross unrealized losses

^[1]

(11,077)

(55,904)

Available-for-sale securities

2,703,060

3,070,447

Held-to-maturity Securities, Amortized cost

^[2]

3,960,714

4,218,854

Held-to-maturity Securities, Gross unrealized gains

^[2]

21,694

6,077

Held-to-maturity Securities, Gross unrealized losses

^[2]

(35,626)

(102,024)

Held-to-maturity securities, Estimated fair value

^[2]

3,946,782

4,122,907

U.S. Government Agency Securities [Member]

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

299

5,237

Available for sale securities, unrealized gains

^[1]

1

13

Available-for-sale Securities, Gross unrealized losses

^[1]

(35)

Available-for-sale securities

300

5,215

State And Municipal Securities [Member]

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

43,073

72,487

Available for sale securities, unrealized gains

^[1]

228

Available-for-sale Securities, Gross unrealized losses

^[1]

(4,261)

Available-for-sale securities

43,301

68,226

Mortgage Backed Securities [Member] | Agency [Member]

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

201,205

234,292

Available for sale securities, unrealized gains

^[1]

724

88

Available-for-sale Securities, Gross unrealized losses

^[1]

(1,434)

(3,972)

Available-for-sale securities

200,495

230,408

Held-to-maturity Securities, Amortized cost

^[2]

1,105,865

1,198,442

Held-to-maturity Securities, Gross unrealized gains

^[2]

13,023

1,307

Held-to-maturity Securities, Gross unrealized losses

^[2]

(7,863)

(31,689)

Held-to-maturity securities, Estimated fair value

^[2]

1,111,025

1,168,060

Mortgage Backed Securities [Member] | Commercial [Member]

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

78,399

74,411

Available for sale securities, unrealized gains

^[1]

266

4

Available-for-sale Securities, Gross unrealized losses

^[1]

(700)

(4,700)

Available-for-sale securities

77,965

69,715

Held-to-maturity Securities, Amortized cost

^[2]

37,262

51,524

Held-to-maturity Securities, Gross unrealized gains

^[2]

732

185

Held-to-maturity securities, Estimated fair value

^[2]

37,994

51,709

Mortgage Backed Securities [Member] | Non-Agency [Member]

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

1,110

1,245

Available-for-sale Securities, Gross unrealized losses

^[1]

(20)

(26)

Available-for-sale securities

1,090

1,219

Held-to-maturity Securities, Amortized cost

^[2]

10,377

Held-to-maturity Securities, Gross unrealized gains

^[2]

161

Held-to-maturity securities, Estimated fair value

^[2]

10,538

Corporate Fixed Income Securities [Member]

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

788,255

958,406

Available for sale securities, unrealized gains

^[1]

9,982

Available-for-sale Securities, Gross unrealized losses

^[1]

(716)

(26,802)

Available-for-sale securities

797,521

931,604

Asset-Backed Securities [Member]

Schedule Of Available For Sale And Held To Maturity Securities [Line Items]

Available-for-sale Securities, Amortized cost

1,590,075

1,779,496

Available for sale securities, unrealized gains

^[1]

520

672

Available-for-sale Securities, Gross unrealized losses

^[1]

(8,207)

(16,108)

Available-for-sale securities

1,582,388

1,764,060

Held-to-maturity Securities, Amortized cost

^[2]

2,807,210

2,968,888

Held-to-maturity Securities, Gross unrealized gains

^[2]

7,778

4,585

Held-to-maturity Securities, Gross unrealized losses

^[2]

(27,763)

(70,335)

Held-to-maturity securities, Estimated fair value

^[2]

$ 2,787,225

$ 2,903,138

[1]	Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.
[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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Schedule of available for sale and held to maturity securities.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Topic 320
-SubTopic 10
-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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