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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	1,164,609	2,054,583
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	10,145	40,139
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	520,353	759,881
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	7,812	22,547
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,684,962	2,814,464
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	17,957	62,686
Debt Securities | GSE certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		576,970
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		10,598
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	228,788	232,969
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	405	5,363
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	228,788	809,939
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	405	15,961
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	127,725	465,779
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	263	1,892
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	138,221	99,050
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	806	2,348
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	265,946	564,829
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	1,069	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	115,529	276,113
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	362	2,629
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	68,707	329,372
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	705	6,359
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	184,236	605,485
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	1,067	8,988
Debt Securities | Municipal bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		5,876
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		21
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	9,745	48,837
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	485	2,542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	9,745	54,713
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	485	2,563
Debt Securities | Capital trust notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	38,645	38,360
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	5,161	5,422
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	38,645	38,360
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	5,161	5,422
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	382,583	69,166
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	2,972	430
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	382,583	69,166
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	2,972	430
Debt Securities | Corporate Bond Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	538,772	642,843
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	6,548	23,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	24,647	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	44
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	563,419	642,843
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	6,592	23,105
Equity securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		17,836
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		1,464
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	11,600	11,293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	206	513
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	11,600	29,129
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 206	$ 1,977

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ 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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