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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Securities held-to-maturity: |  |
Amortized Cost | $ 962,282 | $ 962,203
Gross Unrealized Gains | 26,127 | 296
Gross Unrealized Losses | (7,538) | (30,214)
Fair Value | 980,871 | 932,285
Securities available-for-sale: |  |
Amortized Cost | 1,298,196 | 838,768
Gross Unrealized Gains | 6,065 | 198
Gross Unrealized Losses | (1,476) | (5,370)
Fair Value | 1,302,785 | 833,596
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost | 1,363 | 1,485
Gross Unrealized Gains | 53 | 19
Gross Unrealized Losses | 0 | 0
Fair Value | 1,416 | 1,504
Private label residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 1,452 | 1,755
Gross Unrealized Gains | 4 | 14
Gross Unrealized Losses | (3) | (1)
Fair Value | 1,453 | 1,768
Corporate bonds |  |
Securities available-for-sale: |  |
Amortized Cost | 60,167 | 26,657
Gross Unrealized Gains | 285 | 0
Gross Unrealized Losses | (339) | (505)
Fair Value | 60,113 | 26,152
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 939,215 | 111,719
Gross Unrealized Gains | 4,430 | 31
Gross Unrealized Losses | (939) | (282)
Fair Value | 942,706 | 111,468
Commercial mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 11,186 |
Gross Unrealized Gains | 212 |
Gross Unrealized Losses | 0 |
Fair Value | 11,398 |
Agency mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 284,813 | 697,152
Gross Unrealized Gains | 1,081 | 134
Gross Unrealized Losses | (195) | (4,582)
Fair Value | 285,699 | 692,704
Corporate bonds |  |
Securities held-to-maturity: |  |
Amortized Cost | 239,675 | 239,274
Gross Unrealized Gains | 10,101 | 255
Gross Unrealized Losses | (572) | (20,946)
Fair Value | 249,204 | 218,583
Collateralized loan obligations |  |
Securities held-to-maturity: |  |
Amortized Cost | 416,322 | 416,284
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6,692) | (5,077)
Fair Value | 409,630 | 411,207
Commercial mortgage-backed securities |  |
Securities held-to-maturity: |  |
Amortized Cost | 306,285 | 306,645
Gross Unrealized Gains | 16,026 | 41
Gross Unrealized Losses | (274) | (4,191)
Fair Value | $ 322,037 | $ 302,495

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