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

Mar. 31, 2019

Dec. 31, 2018

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

Amortized Cost

$ 5,731,328

$ 5,660,418

Gross Unrealized Gain

55,387

46,339

Gross Unrealized Loss

29,943

62,686

Fair Value

5,756,772

5,644,071

Mortgage-Related Securities

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

Amortized Cost

2,828,433

2,953,957

Gross Unrealized Gain

33,017

26,526

Gross Unrealized Loss

10,690

20,201

Fair Value

2,850,760

2,960,282

Mortgage-Related Securities | GSE certificates

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

Amortized Cost

1,380,756

1,705,336

Gross Unrealized Gain

21,538

18,146

Gross Unrealized Loss

6,663

15,961

Fair Value

1,395,631

1,707,521

Mortgage-Related Securities | GSE CMOs

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

Amortized Cost

1,447,677

1,248,621

Gross Unrealized Gain

11,479

8,380

Gross Unrealized Loss

4,027

4,240

Fair Value

1,455,129

1,252,761

Equity Securities [Member]

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

Amortized Cost

32,162

32,162

Gross Unrealized Gain

481

366

Gross Unrealized Loss

515

1,977

Fair Value

32,128

30,551

Equity Securities [Member] | Preferred stock

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

Amortized Cost

15,292

15,292

Gross Unrealized Gain

0

Gross Unrealized Loss

145

1,446

Fair Value

15,147

13,846

Equity Securities [Member] | Mutual Funds and Common Stock

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

Amortized Cost

^[1]

16,870

16,870

Gross Unrealized Gain

^[1]

481

366

Gross Unrealized Loss

^[1]

370

531

Fair Value

^[1]

16,981

16,705

Debt Securities [Member]

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

Amortized Cost

2,870,733

2,674,299

Gross Unrealized Gain

21,889

19,447

Gross Unrealized Loss

18,738

40,508

Fair Value

2,873,884

2,653,238

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

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

Amortized Cost

29,659

Gross Unrealized Gain

3

Gross Unrealized Loss

0

Fair Value

29,662

Debt Securities [Member] | GSE debentures

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

Amortized Cost

1,478,777

1,334,549

Gross Unrealized Gain

5,211

3,366

Gross Unrealized Loss

1,615

8,988

Fair Value

1,482,373

1,328,927

Debt Securities [Member] | Corporate bonds

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

Amortized Cost

859,644

836,153

Gross Unrealized Gain

9,292

8,667

Gross Unrealized Loss

8,881

23,105

Fair Value

860,055

821,715

Debt Securities [Member] | Municipal bonds

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

Amortized Cost

68,277

68,551

Gross Unrealized Gain

423

195

Gross Unrealized Loss

1,502

2,563

Fair Value

67,198

66,183

Debt Securities [Member] | Capital trust notes

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

Amortized Cost

48,291

48,278

Gross Unrealized Gain

6,614

6,435

Gross Unrealized Loss

4,983

5,422

Fair Value

49,922

49,291

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

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

Amortized Cost

^[2]

386,085

386,768

Gross Unrealized Gain

^[2]

346

784

Gross Unrealized Loss

^[2]

1,757

430

Fair Value

^[2]

384,674

387,122

Mortgage Backed Securities And Other Securities [Member]

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

Amortized Cost

5,699,166

^[3]

5,628,256

^[4]

Gross Unrealized Gain

54,906

^[3]

45,973

^[4]

Gross Unrealized Loss

29,428

^[3]

60,709

^[4]

Fair Value

$ 5,724,644

^[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 March 31, 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=82897076&loc=d3e27161-111563

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