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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, 2018	Dec. 31, 2017
Debt Securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	$ 2,437,529	$ 895,352
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	38,530	4,347
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	118,675	108,144
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	9,814	10,099
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	2,556,204	1,003,496
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	48,344	14,446
Debt Securities | GSE certificates
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	959,158	232,546
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	23,556	535
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	19,434	20,440
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	1,284	664
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	978,592	252,986
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	24,840	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	329,114	118,694
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	4,418	826
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	329,114	118,694
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	4,418	826
Debt Securities | U.S. Treasury obligations
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	199,695	199,898
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	143	62
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	199,695	199,898
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	143	62
Debt Securities | Municipal bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value		11,169
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss		259
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	50,087	41,054
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	2,119	542
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	50,087	52,223
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	2,119	801
Debt Securities | Capital trust notes
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	37,883	35,105
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	5,876	8,632
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	37,883	35,105
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	5,876	8,632
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	524,847
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	9,146
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	524,847
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	9,146
Debt Securities | Corporate bonds
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	293,218
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	898
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	293,218
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	898
Debt Securities | Asset backed securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	112,408
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	158
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	112,408
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	158
Equity securities
Schedule of Investments [Line Items]
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Fair Value	19,089
Temporarily Impaired Available-for-Sale Securities, Less than Twelve Months Unrealized Loss	211
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Fair Value	11,271	11,545
Temporarily Impaired Available-for-Sale Securities, Twelve Months or Longer Unrealized Loss	535	261
Temporarily Impaired Available-for-Sale Securities, Total Fair Value	30,360	11,545
Temporarily Impaired Available-for-Sale Securities, Total Unrealized Loss	$ 746	$ 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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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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