Investment Securities - Major Components of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Amortized Cost	$ 12,588,783	$ 16,375,941
Unrealized Gains	49,245	47,578
Unrealized Losses	(17,617)	(42,771)
Carrying Value	12,620,411	16,380,748
U.S. treasury securities
Investment Holdings [Line Items]
Amortized Cost	8,880,358	11,679,450
Unrealized Gains	30,323	19,134
Unrealized Losses	(1,190)	(20,549)
Carrying Value	8,909,491	11,678,035
U.S. agency debentures
Investment Holdings [Line Items]
Amortized Cost	2,065,535	2,677,453
Unrealized Gains	14,443	17,684
Unrealized Losses	(1,603)	(5,108)
Carrying Value	2,078,375	2,690,029
Residential mortgage-backed securities \| Agency-issued collateralized mortgage obligations \| Fixed rate
Investment Holdings [Line Items]
Amortized Cost	1,163,017	1,408,206
Unrealized Gains	3,046	6,591
Unrealized Losses	(13,398)	(15,518)
Carrying Value	1,152,665	1,399,279
Residential mortgage-backed securities \| Agency-issued collateralized mortgage obligations \| Variable rate
Investment Holdings [Line Items]
Amortized Cost	474,238	604,236
Unrealized Gains	685	3,709
Unrealized Losses	(640)	(9)
Carrying Value	474,283	607,936
Equity securities
Investment Holdings [Line Items]
Amortized Cost	5,635	6,596
Unrealized Gains	748	460
Unrealized Losses	(786)	(1,587)
Carrying Value	$ 5,597	$ 5,469

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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