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

Mar. 31, 2021

Dec. 31, 2020

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

Amortized Cost

$ 6,243,021

^[1]

$ 5,743,929

^[2]

Gross Unrealized Gain

101,046

^[1]

130,677

^[2]

Gross Unrealized Loss

150,361

^[1]

29,697

^[2]

Fair Value

6,193,706

^[1]

5,844,909

^[2]

Asset-backed Securities

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

Amortized Cost

520,111

^[3]

530,226

^[4]

Gross Unrealized Gain

4,030

^[3]

2,576

^[4]

Gross Unrealized Loss

3,368

^[3]

5,703

^[4]

Fair Value

520,773

^[3]

527,099

^[4]

Mutual Funds

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

Amortized Cost

15,814

15,814

Gross Unrealized Gain

116

269

Gross Unrealized Loss

129

Fair Value

15,801

16,083

Mortgage-Related Securities

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

Amortized Cost

3,191,601

2,942,332

Gross Unrealized Gain

69,310

99,001

Gross Unrealized Loss

65,323

3,008

Fair Value

3,195,588

3,038,325

Mortgage-Related Securities | GSE Certificates

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

Amortized Cost

1,183,746

1,155,436

Gross Unrealized Gain

40,473

54,310

Gross Unrealized Loss

14,901

136

Fair Value

1,209,318

1,209,610

Mortgage-Related Securities | GSE CMOs

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

Amortized Cost

2,007,855

1,786,896

Gross Unrealized Gain

28,837

44,691

Gross Unrealized Loss

50,422

2,872

Fair Value

1,986,270

1,828,715

Debt Securities

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

Amortized Cost

3,035,606

2,770,491

Gross Unrealized Gain

31,620

31,206

Gross Unrealized Loss

84,909

26,689

Fair Value

2,982,317

2,775,008

Debt Securities | U.S. Treasury Obligations

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

Amortized Cost

64,993

64,984

Gross Unrealized Gain

5

1

Fair Value

64,998

64,985

Debt Securities | GSE Debentures

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

Amortized Cost

1,433,280

1,158,253

Gross Unrealized Gain

2,693

3,998

Gross Unrealized Loss

67,632

3,949

Fair Value

1,368,341

1,158,302

Debt Securities | Municipal Bonds

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

Amortized Cost

25,715

25,776

Gross Unrealized Gain

482

625

Gross Unrealized Loss

186

90

Fair Value

26,011

26,311

Debt Securities | Corporate Bonds

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

Amortized Cost

870,886

870,745

Gross Unrealized Gain

16,594

17,928

Gross Unrealized Loss

5,410

6,447

Fair Value

882,070

882,226

Debt Securities | Foreign Notes

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

Amortized Cost

25,000

25,000

Gross Unrealized Gain

993

538

Fair Value

25,993

25,538

Debt Securities | Capital Trust Notes

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

Amortized Cost

95,621

95,507

Gross Unrealized Gain

6,823

5,540

Gross Unrealized Loss

8,313

10,500

Fair Value

94,131

90,547

Mortgage Backed Securities And Other Securities

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

Amortized Cost

6,227,207

5,712,823

Gross Unrealized Gain

100,930

130,207

Gross Unrealized Loss

150,232

29,697

Fair Value

6,177,905

5,813,333

Equity Securities

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

Amortized Cost

15,814

31,106

Gross Unrealized Gain

116

470

Gross Unrealized Loss

129

Fair Value

$ 15,801

31,576

Equity Securities | Preferred Stock

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

Amortized Cost

15,292

Gross Unrealized Gain

201

Fair Value

$ 15,493

[1]	Excludes accrued interest receivable of $14.8 million included in other assets in the Consolidated Statements of Condition.
[2]	Excludes accrued interest receivable of $14.9 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]	The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.

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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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