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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 53,414 | $ 0
Gross Unrealized Gains | 82 |
Gross Unrealized Losses | (193) |
Fair Value | 53,303 |
Available for sale |  |
Amortized Cost | 486,564 | 344,878
Gross Unrealized Gains | 2,070 | 1,435
Gross Unrealized Losses | (1,341) | (618)
Fair Value | 487,293 | 345,695
Corporate bonds |  |
Held to maturity |  |
Amortized Cost | 53,414 |
Gross Unrealized Gains | 82 |
Gross Unrealized Losses | (193) |
Fair Value | 53,303 |
SBA loan pool securities |  |
Available for sale |  |
Amortized Cost | 1,600 | 1,697
Gross Unrealized Gains | 18 | 18
Gross Unrealized Losses | 0 | 0
Fair Value | 1,618 | 1,715
U.S. government-sponsored entities and agency securities |  |
Available for sale |  |
Amortized Cost | 1,946 | 1,940
Gross Unrealized Gains | 54 | 42
Gross Unrealized Losses | 0 | 0
Fair Value | 2,000 | 1,982
Private label residential mortgage-backed securities |  |
Available for sale |  |
Amortized Cost | 2,135 | 3,169
Gross Unrealized Gains | 13 | 12
Gross Unrealized Losses | (2) | (13)
Fair Value | 2,146 | 3,168
Agency mortgage-backed securities |  |
Available for sale |  |
Amortized Cost | 480,883 | 338,072
Gross Unrealized Gains | 1,985 | 1,363
Gross Unrealized Losses | (1,339) | (605)
Fair Value | $ 481,529 | $ 338,830

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- Definition Amount before tax of unrealized gain 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 (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition 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=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: 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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