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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 1,601,085	$ 2,054,583
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	13,848	40,139
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	813,733	759,881
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	16,095	22,547
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	2,414,818	2,814,464
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	29,943	62,686
Debt Securities | GSE certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	0	576,970
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	0	10,598
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	440,027	232,969
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	6,663	5,363
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	440,027	809,939
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	6,663	15,961
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	428,352	465,779
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	1,894	1,892
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	146,100	99,050
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	2,133	2,348
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	574,452	564,829
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	4,027	4,240
Debt Securities | U.S. Treasury obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	218,933	276,113
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	1,171	2,629
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	127,748	329,372
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	444	6,359
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	346,681	605,485
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	1,615	8,988
Debt Securities | Municipal bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	0	5,876
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	0	21
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	49,612	48,837
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	1,502	2,542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	49,612	54,713
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	1,502	2,563
Debt Securities | Capital trust notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	0	0
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	0	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	38,811	38,360
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	4,983	5,422
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	38,811	38,360
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	4,983	5,422
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	237,208	69,166
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	1,757	430
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	0	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	0	0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	237,208	69,166
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	1,757	430
Debt Securities | Corporate Bond Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	701,445	642,843
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	8,881	23,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	0	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	0	0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	701,445	642,843
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	8,881	23,105
Equity securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	15,147	17,836
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	145	1,464
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	11,435	11,293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	370	513
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	26,582	29,129
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 515	$ 1,977

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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 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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