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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities held-to-maturity: |  |
Amortized Cost | $ 863,269 | $ 884,234
Gross Unrealized Gains | 18,093 | 17,442
Gross Unrealized Losses | (1,464) | (1,933)
Fair Value | 879,898 | 899,743
Securities available-for-sale: |  |
Amortized Cost | 2,451,151 | 2,396,968
Gross Unrealized Gains | 12,717 | 12,958
Gross Unrealized Losses | (29,327) | (28,438)
Fair Value | 2,434,541 | 2,381,488
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost | 1,138 | 1,221
Gross Unrealized Gains | 7 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1,145 | 1,221
Private label residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 121,214 | 121,397
Gross Unrealized Gains | 16 | 18
Gross Unrealized Losses | (4,473) | (4,238)
Fair Value | 116,757 | 117,177
Corporate bonds |  |
Securities available-for-sale: |  |
Amortized Cost | 19,134 | 48,574
Gross Unrealized Gains | 105 | 482
Gross Unrealized Losses | (95) | (108)
Fair Value | 19,144 | 48,948
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 1,489,865 | 1,395,094
Gross Unrealized Gains | 12,581 | 12,449
Gross Unrealized Losses | (193) | (674)
Fair Value | 1,502,253 | 1,406,869
Agency mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 819,800 | 830,682
Gross Unrealized Gains | 8 | 9
Gross Unrealized Losses | (24,566) | (23,418)
Fair Value | 795,242 | 807,273
Corporate bonds |  |
Securities held-to-maturity: |  |
Amortized Cost | 240,304 | 240,090
Gross Unrealized Gains | 13,722 | 13,032
Gross Unrealized Losses | 0 | (91)
Fair Value | 254,026 | 253,031
Collateralized loan obligations |  |
Securities held-to-maturity: |  |
Amortized Cost | 317,223 | 338,226
Gross Unrealized Gains | 1,484 | 1,461
Gross Unrealized Losses | (70) | (61)
Fair Value | 318,637 | 339,626
Commercial mortgage-backed securities |  |
Securities held-to-maturity: |  |
Amortized Cost | 305,742 | 305,918
Gross Unrealized Gains | 2,887 | 2,949
Gross Unrealized Losses | (1,394) | (1,781)
Fair Value | $ 307,235 | $ 307,086

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