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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 1,439,788	$ 2,054,583
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	19,209	40,139
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	290,924	759,881
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	8,443	22,547
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,730,712	2,814,464
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	27,652	62,686
Debt Securities | GSE certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	165,955	576,970
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	334	10,598
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	7,866	232,969
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	60	5,363
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	173,821	809,939
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	394	15,961
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	395,590	465,779
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	959	1,892
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	104,844	99,050
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	738	2,348
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	500,434	564,829
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	1,697	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	128,052	276,113
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	821	2,629
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	118,879	329,372
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	1,182	6,359
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	246,931	605,485
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	2,003	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	9,793	48,837
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	382	2,542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	9,793	54,713
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	382	2,563
Debt Securities | Capital trust notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	45,999
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	690
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	37,855	38,360
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	5,963	5,422
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	83,854	38,360
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	6,653	5,422
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	378,256	69,166
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	6,528	430
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	378,256	69,166
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	6,528	430
Debt Securities | Corporate Bond Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	325,936	642,843
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	9,877	23,105
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	325,936	642,843
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	9,877	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	11,687	11,293
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	118	513
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	11,687	29,129
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 118	$ 1,977

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

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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=118939692&loc=d3e27337-111563

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