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

Sep. 30, 2019

Dec. 31, 2018

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

Amortized Cost

$ 5,826,222

$ 5,660,418

Gross Unrealized Gain

88,859

46,339

Gross Unrealized Loss

27,652

62,686

Fair Value

5,887,429

5,644,071

Mortgage-related Securities

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

Amortized Cost

3,283,394

2,953,957

Gross Unrealized Gain

60,376

26,526

Gross Unrealized Loss

2,091

20,201

Fair Value

3,341,679

2,960,282

Mortgage-related Securities | GSE certificates

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

Amortized Cost

1,538,922

1,705,336

Gross Unrealized Gain

34,377

18,146

Gross Unrealized Loss

394

15,961

Fair Value

1,572,905

1,707,521

Mortgage-related Securities | GSE CMOs

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

Amortized Cost

1,744,472

1,248,621

Gross Unrealized Gain

25,999

8,380

Gross Unrealized Loss

1,697

4,240

Fair Value

1,768,774

1,252,761

Equity Securities [Member]

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

Amortized Cost

32,163

32,162

Gross Unrealized Gain

816

366

Gross Unrealized Loss

118

1,977

Fair Value

32,861

30,551

Equity Securities [Member] | Preferred stock

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

Amortized Cost

15,292

15,292

Gross Unrealized Gain

81

Gross Unrealized Loss

1,446

Fair Value

15,373

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]

735

366

Gross Unrealized Loss

^[1]

118

531

Fair Value

^[1]

17,488

16,705

Debt Securities [Member]

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

Amortized Cost

2,510,665

2,674,299

Gross Unrealized Gain

27,667

19,447

Gross Unrealized Loss

25,443

40,508

Fair Value

2,512,889

2,653,238

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

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

Amortized Cost

29,763

Gross Unrealized Gain

6

Fair Value

29,769

Debt Securities [Member] | GSE debentures

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

Amortized Cost

1,137,235

1,334,549

Gross Unrealized Gain

7,231

3,366

Gross Unrealized Loss

2,003

8,988

Fair Value

1,142,463

1,328,927

Debt Securities [Member] | Corporate bonds

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

Amortized Cost

836,558

836,153

Gross Unrealized Gain

13,333

8,667

Gross Unrealized Loss

9,877

23,105

Fair Value

840,014

821,715

Debt Securities [Member] | Municipal bonds

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

Amortized Cost

27,319

68,551

Gross Unrealized Gain

620

195

Gross Unrealized Loss

382

2,563

Fair Value

27,557

66,183

Debt Securities [Member] | Capital trust notes

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

Amortized Cost

95,006

48,278

Gross Unrealized Gain

6,477

6,435

Gross Unrealized Loss

6,653

5,422

Fair Value

94,830

49,291

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

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

Amortized Cost

^[2]

384,784

386,768

Gross Unrealized Gain

^[2]

784

Gross Unrealized Loss

^[2]

6,528

430

Fair Value

^[2]

378,256

387,122

Mortgage Backed Securities And Other Securities [Member]

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

Amortized Cost

5,794,059

^[3]

5,628,256

^[4]

Gross Unrealized Gain

88,043

^[3]

45,973

^[4]

Gross Unrealized Loss

27,534

^[3]

60,709

^[4]

Fair Value

$ 5,854,568

^[3]

$ 5,613,520

^[4]

[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 September 30, 2019, the non-credit portion of OTTI recorded in AOCL was $8.6 million before taxes.
[4]	The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At December 31, 2018, the non-credit portion of OTTI recorded in AOCL was $8.6 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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