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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Held-to-maturity |  |
Amortized Cost | $ 962,203 | $ 0
Gross Unrealized Gains | 296 |
Gross Unrealized Losses | (30,214) |
Securities held-to-maturity | 932,285 | 0
Available-for-sale |  |
Amortized Cost | 838,768 | 344,878
Gross Unrealized Gains | 198 | 1,435
Gross Unrealized Losses | (5,370) | (618)
Fair Value | 833,596 | 345,695
SBA loan pool securities |  |
Available-for-sale |  |
Amortized Cost | 1,485 | 1,697
Gross Unrealized Gains | 19 | 18
Gross Unrealized Losses | 0 | 0
Fair Value | 1,504 | 1,715
U.S. government-sponsored entities and agency securities |  |
Available-for-sale |  |
Amortized Cost |  | 1,940
Gross Unrealized Gains |  | 42
Gross Unrealized Losses |  | 0
Fair Value |  | 1,982
Private label residential mortgage-backed securities |  |
Available-for-sale |  |
Amortized Cost | 1,755 | 3,169
Gross Unrealized Gains | 14 | 12
Gross Unrealized Losses | (1) | (13)
Fair Value | 1,768 | 3,168
Corporate bonds |  |
Available-for-sale |  |
Amortized Cost | 26,657 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (505) |
Fair Value | 26,152 |
Collateralized loan obligations |  |
Available-for-sale |  |
Amortized Cost | 111,719 |
Gross Unrealized Gains | 31 |
Gross Unrealized Losses | (282) |
Fair Value | 111,468 |
Agency mortgage-backed securities |  |
Available-for-sale |  |
Amortized Cost | 697,152 | 338,072
Gross Unrealized Gains | 134 | 1,363
Gross Unrealized Losses | (4,582) | (605)
Fair Value | 692,704 | $ 338,830
Corporate bonds |  |
Held-to-maturity |  |
Amortized Cost | 239,274 |
Gross Unrealized Gains | 255 |
Gross Unrealized Losses | (20,946) |
Securities held-to-maturity | 218,583 |
Collateralized loan obligations |  |
Held-to-maturity |  |
Amortized Cost | 416,284 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (5,077) |
Securities held-to-maturity | 411,207 |
Commercial mortgage-backed securities |  |
Held-to-maturity |  |
Amortized Cost | 306,645 |
Gross Unrealized Gains | 41 |
Gross Unrealized Losses | (4,191) |
Securities held-to-maturity | $ 302,495 |

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