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Summary of Held-to-Maturity and Available-for-Sale Securities Having Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 2,054,583	$ 895,352
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	40,139	4,347
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	759,881	108,144
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	22,547	10,099
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	2,814,464	1,003,496
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	62,686	14,446
Debt Securities | GSE certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	576,970	232,546
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	10,598	535
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	232,969	20,440
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	5,363	664
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	809,939	252,986
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	15,961	1,199
Debt Securities | GSE debentures
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		333,045
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		2,665
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value		0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss		0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value		333,045
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss		2,665
Debt Securities | GSE CMOs
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	465,779	118,694
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	1,892	826
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	99,050	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	2,348	0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	564,829	118,694
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	4,240	826
Debt Securities | U.S. Treasury obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	276,113	199,898
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	2,629	62
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	329,372	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	6,359	0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	605,485	199,898
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	8,988	62
Debt Securities | Municipal bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	5,876	11,169
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	21	259
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	48,837	41,054
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	2,542	542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	54,713	52,223
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	2,563	801
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	38,360	35,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	5,422	8,632
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	38,360	35,105
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	5,422	8,632
Debt Securities | Asset-backed Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	69,166
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	430
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	69,166
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	430
Debt Securities | Corporate Bond Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	642,843
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	23,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	0
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	642,843
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	23,105
Equity securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	17,836	0
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	1,464	0
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	11,293	11,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	513	261
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	29,129	11,545
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 1,977	$ 261

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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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+ 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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