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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
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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. + Details
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- Definition 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 + Details
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- Definition 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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