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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, 2018	Dec. 31, 2017
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 2,951,905	$ 895,352
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	62,383	4,347
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	118,623	108,144
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	8,524	10,099
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	3,070,528	1,003,496
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	70,907	14,446
Debt Securities | GSE certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	1,209,277	232,546
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	31,983	535
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	18,248	20,440
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	1,378	664
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	1,227,525	252,986
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	33,361	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, 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	488,185	118,694
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	6,133	826
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	488,185	118,694
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	6,133	826
Debt Securities | U.S. Treasury and GSE Obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	992,186
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	22,868
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	992,186
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	22,868
Debt Securities | Municipal bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	5,884	11,169
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	14	259
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	50,082	41,054
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	1,863	542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	55,966	52,223
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	1,877	801
Debt Securities | Capital trust notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	39,109	35,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	4,661	8,632
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	39,109	35,105
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	4,661	8,632
Debt Securities | U.S. Treasury obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		199,898
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		62
Temporarily Impaired Available-for-Sale Securities, Total Fair Value		199,898
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss		62
Debt Securities | Corporate bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	160,268
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	655
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	160,268
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	655
Debt Securities | Asset backed securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	77,000
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	534
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	77,000
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	534
Equity securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	19,105
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	196
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	11,184	11,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	622	261
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	30,289	11,545
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 818	$ 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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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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