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

Jun. 30, 2020

Dec. 31, 2019

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

Amortized Cost

$ 5,100,223

^[1]

$ 5,841,796

Gross Unrealized Gain

151,470

^[1]

77,498

Gross Unrealized Loss

49,993

^[1]

33,407

Fair Value

5,201,700

^[1]

5,885,887

Asset-backed Securities

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

Amortized Cost

440,261

^[2]

384,108

Gross Unrealized Gain

^[2]

94

Gross Unrealized Loss

18,962

^[2]

10,854

Fair Value

421,393

^[2]

373,254

Mutual Funds and Common Stock

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

Amortized Cost

16,871

^[3]

16,871

Gross Unrealized Gain

1,458

^[3]

718

Gross Unrealized Loss

173

Fair Value

18,329

^[3]

17,416

Mortgage-related Securities

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

Amortized Cost

2,901,629

3,313,757

Gross Unrealized Gain

126,206

47,282

Gross Unrealized Loss

883

7,304

Fair Value

3,026,952

3,353,735

Mortgage-related Securities | GSE Certificates

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

Amortized Cost

1,288,192

1,530,317

Gross Unrealized Gain

69,358

26,069

Gross Unrealized Loss

35

3,763

Fair Value

1,357,515

1,552,623

Mortgage-related Securities | GSE CMOs

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

Amortized Cost

1,613,437

1,783,440

Gross Unrealized Gain

56,848

21,213

Gross Unrealized Loss

848

3,541

Fair Value

1,669,437

1,801,112

Debt Securities

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

Amortized Cost

2,166,431

2,495,876

Gross Unrealized Gain

23,806

29,376

Gross Unrealized Loss

49,007

25,930

Fair Value

2,141,230

2,499,322

Debt Securities | U.S. Treasury Obligations

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

Amortized Cost

61,938

41,820

Gross Unrealized Gain

46

19

Gross Unrealized Loss

3

Fair Value

61,981

41,839

Debt Securities | GSE Debentures

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

Amortized Cost

672,101

1,093,845

Gross Unrealized Gain

6,439

5,707

Gross Unrealized Loss

5,312

Fair Value

678,540

1,094,240

Debt Securities | Municipal Bonds

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

Amortized Cost

26,366

26,808

Gross Unrealized Gain

729

559

Gross Unrealized Loss

185

475

Fair Value

26,910

26,892

Debt Securities | Corporate Bonds

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

Amortized Cost

870,475

854,195

Gross Unrealized Gain

11,434

15,970

Gross Unrealized Loss

15,084

2,983

Fair Value

866,825

867,182

Debt Securities | Capital Trust Notes

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

Amortized Cost

95,290

95,100

Gross Unrealized Gain

5,064

7,121

Gross Unrealized Loss

14,773

6,306

Fair Value

85,581

95,915

Mortgage Backed Securities And Other Securities

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

Amortized Cost

5,068,060

5,809,633

Gross Unrealized Gain

150,012

76,658

Gross Unrealized Loss

49,890

33,234

Fair Value

5,168,182

5,853,057

Equity Securities

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

Amortized Cost

32,163

32,163

Gross Unrealized Gain

1,458

840

Gross Unrealized Loss

103

173

Fair Value

33,518

32,830

Equity Securities | Preferred stock

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

Amortized Cost

15,292

15,292

Gross Unrealized Gain

122

Gross Unrealized Loss

103

Fair Value

$ 15,189

$ 15,414

[1]	Excludes accrued interest receivable of $16.5 million included in other assets in the Consolidated Statements of Condition.
[2]	The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[3]	Primarily consists of mutual funds that are CRA-qualified investments.

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+ 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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