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

Dec. 31, 2019

Dec. 31, 2018

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

Amortized Cost

$ 5,841,796

$ 5,660,418

Gross Unrealized Gain

77,498

46,339

Gross Unrealized Loss

33,407

62,686

Fair Value

5,885,887

5,644,071

Mortgage-related Securities

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

Amortized Cost

3,313,757

2,953,957

Gross Unrealized Gain

47,282

26,526

Gross Unrealized Loss

7,304

20,201

Fair Value

3,353,735

2,960,282

Mortgage-related Securities | GSE certificates

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

Amortized Cost

1,530,317

1,705,336

Gross Unrealized Gain

26,069

18,146

Gross Unrealized Loss

3,763

15,961

Fair Value

1,552,623

1,707,521

Mortgage-related Securities | GSE CMOs

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

Amortized Cost

1,783,440

1,248,621

Gross Unrealized Gain

21,213

8,380

Gross Unrealized Loss

3,541

4,240

Fair Value

1,801,112

1,252,761

Equity Securities [Member]

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

Amortized Cost

32,163

32,162

Gross Unrealized Gain

840

366

Gross Unrealized Loss

173

1,977

Fair Value

32,830

30,551

Equity Securities [Member] | Preferred stock

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

Amortized Cost

15,292

15,292

Gross Unrealized Gain

122

Gross Unrealized Loss

1,446

Fair Value

15,414

13,846

Equity Securities [Member] | Mutual Funds and Common Stock

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

Amortized Cost

^[1]

16,871

16,870

Gross Unrealized Gain

^[1]

718

366

Gross Unrealized Loss

^[1]

173

531

Fair Value

^[1]

17,416

16,705

Debt Securities [Member]

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

Amortized Cost

2,495,876

2,674,299

Gross Unrealized Gain

29,376

19,447

Gross Unrealized Loss

25,930

40,508

Fair Value

2,499,322

2,653,238

Debt Securities [Member] | U.S. Treasury obligations

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

Amortized Cost

41,820

Gross Unrealized Gain

19

Fair Value

41,839

Debt Securities [Member] | GSE debentures

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

Amortized Cost

1,093,845

1,334,549

Gross Unrealized Gain

5,707

3,366

Gross Unrealized Loss

5,312

8,988

Fair Value

1,094,240

1,328,927

Debt Securities [Member] | Corporate bonds

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

Amortized Cost

854,195

836,153

Gross Unrealized Gain

15,970

8,667

Gross Unrealized Loss

2,983

23,105

Fair Value

867,182

821,715

Debt Securities [Member] | Municipal bonds

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

Amortized Cost

26,808

68,551

Gross Unrealized Gain

559

195

Gross Unrealized Loss

475

2,563

Fair Value

26,892

66,183

Debt Securities [Member] | Capital trust notes

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

Amortized Cost

95,100

48,278

Gross Unrealized Gain

7,121

6,435

Gross Unrealized Loss

6,306

5,422

Fair Value

95,915

49,291

Debt Securities [Member] | Asset-backed Securities [Member]

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

Amortized Cost

^[2]

384,108

386,768

Gross Unrealized Gain

^[2]

784

Gross Unrealized Loss

^[2]

10,854

430

Fair Value

^[2]

373,254

387,122

Mortgage Backed Securities And Other Securities [Member]

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

Amortized Cost

^[3]

5,809,633

5,628,256

Gross Unrealized Gain

^[3]

76,658

45,973

Gross Unrealized Loss

^[3]

33,234

60,709

Fair Value

^[3]

$ 5,853,057

$ 5,613,520

[1]	Primarily consists of mutual funds that are CRA-qualified investments.
[2]	The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[3]	The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At December 31, 2019, the non-credit portion of OTTI recorded in AOCL was $0.0 million before taxes.

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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=118939692&loc=d3e27161-111563

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