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INVESTMENT SECURITIES - Aggregate amortized cost and market value of the securities by issuers (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]
Amortized cost	$ 1,903,878	$ 1,908,557
Fair Value	1,891,016	1,881,920
Federal Home Loan Mortgage Corporation Certificates And Obligations F H L M C [Member]
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]
Amortized cost	375,719	399,955
Fair Value	370,855	394,249
Government National Mortgage Association Certificates And Obligations G N M A [Member]
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]
Amortized cost	250,140	254,495
Fair Value	257,192	265,615
Federal National Mortgage Association Certificates And Obligations F N M A [Member]
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]
Amortized cost	801,198	849,584
Fair Value	796,726	843,818
FHLB [Member]
Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]
Amortized cost	299,949	231,666
Fair Value	$ 296,767	$ 229,792

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- Definition

Schedule Of Available-For-Sale And Held-To-Maturity Securities [Line Items]

+ References

No definition available.

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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=75030427&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=82897076&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=82896770&loc=d3e26610-111562

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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)
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