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Securities - Summary of Portfolio of Securities Available for Sale (Details) - USD ($)
$ in Thousands

Dec. 31, 2020

Dec. 31, 2019

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

$ 5,743,929

^[1]

$ 5,841,796

^[2]

Gross Unrealized Gain

130,677

^[1]

77,498

^[2]

Gross Unrealized Loss

29,697

^[1]

33,407

^[2]

Fair Value

5,844,909

^[1]

5,885,887

^[2]

Asset-backed Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

^[3]

530,226

384,108

Gross Unrealized Gain

^[3]

2,576

Gross Unrealized Loss

^[3]

5,703

10,854

Fair Value

^[3]

527,099

373,254

Mutual Funds

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

15,814

Gross Unrealized Gain

269

Fair Value

16,083

Mutual Funds and Common Stock

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

^[4]

16,871

Gross Unrealized Gain

^[4]

718

Gross Unrealized Loss

^[4]

173

Fair Value

^[4]

17,416

Mortgage-Related Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

2,942,332

3,313,757

Gross Unrealized Gain

99,001

47,282

Gross Unrealized Loss

3,008

7,304

Fair Value

3,038,325

3,353,735

Mortgage-Related Securities | GSE Certificates

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

1,155,436

1,530,317

Gross Unrealized Gain

54,310

26,069

Gross Unrealized Loss

136

3,763

Fair Value

1,209,610

1,552,623

Mortgage-Related Securities | GSE CMOs

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

1,786,896

1,783,440

Gross Unrealized Gain

44,691

21,213

Gross Unrealized Loss

2,872

3,541

Fair Value

1,828,715

1,801,112

Debt Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

2,770,491

2,495,876

Gross Unrealized Gain

31,206

29,376

Gross Unrealized Loss

26,689

25,930

Fair Value

2,775,008

2,499,322

Debt Securities | U. S. Treasury Obligations

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

64,984

41,820

Gross Unrealized Gain

1

19

Fair Value

64,985

41,839

Debt Securities | GSE Debentures

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

1,158,253

1,093,845

Gross Unrealized Gain

3,998

5,707

Gross Unrealized Loss

3,949

5,312

Fair Value

1,158,302

1,094,240

Debt Securities | Municipal Bonds

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

25,776

26,808

Gross Unrealized Gain

625

559

Gross Unrealized Loss

90

475

Fair Value

26,311

26,892

Debt Securities | Corporate Bonds

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

870,745

854,195

Gross Unrealized Gain

17,928

15,970

Gross Unrealized Loss

6,447

2,983

Fair Value

882,226

867,182

Debt Securities | Foreign Notes

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

25,000

Gross Unrealized Gain

538

Fair Value

25,538

Debt Securities | Capital Trust Notes

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

95,507

95,100

Gross Unrealized Gain

5,540

7,121

Gross Unrealized Loss

10,500

6,306

Fair Value

90,547

95,915

Mortgage Backed Securities And Other Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

5,712,823

5,809,633

Gross Unrealized Gain

130,207

76,658

Gross Unrealized Loss

29,697

33,234

Fair Value

5,813,333

5,853,057

Equity Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

31,106

32,163

Gross Unrealized Gain

470

840

Gross Unrealized Loss

173

Fair Value

31,576

32,830

Equity Securities | Preferred Stock

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost

15,292

15,292

Gross Unrealized Gain

201

122

Fair Value

$ 15,493

$ 15,414

[1]	Excludes accrued interest receivable of $14.9 million included in other assets in the Consolidated Statements of Condition.
[2]	Excludes accrued interest receivable of $24.4 million included in other assets in the Consolidated Statements of Condition.
[3]	The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[4]	Primarily consists of mutual funds that are CRA-qualified investments.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

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