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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Fair Value of Available-for-Sale Investment Securities | The following table presents the amortized cost and fair value of the investment securities portfolio as of the dates indicated:
($ in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
September 30, 2018 |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 910 |  |  | $ | — |  |  | $ | (22 | ) |  | $ | 888 |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | 472,581 |  |  | — |  |  | (33,113 | ) |  | 439,468 |
Non-agency residential mortgage-backed securities |  | 439 |  |  | 12 |  |  | — |  |  | 451 |
Non-agency commercial mortgage-backed securities |  | 135,558 |  |  | — |  |  | (2,854 | ) |  | 132,704 |
Collateralized loan obligations |  | 1,481,415 |  |  | 6,835 |  |  | (1,929 | ) |  | 1,486,321 |
Total securities available-for-sale |  | $ | 2,090,903 |  |  | $ | 6,847 |  |  | $ | (37,918 | ) |  | $ | 2,059,832 |
December 31, 2017 |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 1,056 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 1,058 |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | 492,255 |  |  | 10 |  |  | (15,336 | ) |  | 476,929 |
Non-agency residential mortgage-backed securities |  | 741 |  |  | 16 |  |  | (1 | ) |  | 756 |
Non-agency commercial mortgage-backed securities |  | 305,172 |  |  | 5,339 |  |  | — |  |  | 310,511 |
Collateralized loan obligations |  | 1,691,455 |  |  | 11,129 |  |  | (266 | ) |  | 1,702,318 |
Corporate debt securities |  | 76,714 |  |  | 7,183 |  |  | — |  |  | 83,897 |
Total securities available-for-sale |  | $ | 2,567,393 |  |  | $ | 23,679 |  |  | $ | (15,603 | ) |  | $ | 2,575,469 |
Proceeds from Sales and Calls of Securities and Associated Gross Gains and Losses | The following table presents proceeds from sales and calls of securities available-for-sale and the associated gross gains and losses realized through earnings upon the sales and calls of securities available-for-sale for the periods indicated:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
($ in thousands) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Gross realized gains on sales and calls of securities available-for-sale |  | $ | 13 |  |  | $ | 7,625 |  |  | $ | 5,532 |  |  | $ | 12,080 |
Gross realized losses on sales and calls of securities available-for-sale |  | — |  |  | — |  |  | — |  |  | — |
Net realized gains on sales and calls of securities available-for-sale |  | $ | 13 |  |  | $ | 7,625 |  |  | $ | 5,532 |  |  | $ | 12,080 |
Proceeds from sales and calls of securities available-for-sale |  | $ | 283,114 |  |  | $ | 312,961 |  |  | $ | 896,070 |  |  | $ | 1,199,551 |
Summary of Investment Securities with Unrealized Losses | The following table summarizes the investment securities with unrealized losses by security type and length of time in a continuous unrealized loss position as of the dates indicated:
|  | Less Than 12 Months |  | 12 Months or Longer |  | Total
($ in thousands) |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 888 |  |  | $ | (22 | ) |  | $ | — |  |  | $ | — |  |  | $ | 888 |  |  | $ | (22 | )
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | $ | 14,964 |  |  | $ | (376 | ) |  | $ | 424,417 |  |  | $ | (32,737 | ) |  | $ | 439,381 |  |  | $ | (33,113 | )
Non-agency residential mortgage-backed securities |  | 78 |  |  | — |  |  | 44 |  |  | — |  |  | 122 |  |  | — |
Non-agency commercial mortgage-backed securities |  | 132,703 |  |  | (2,854 | ) |  | — |  |  | — |  |  | 132,703 |  |  | (2,854 | )
Collateralized loan obligations |  | 335,446 |  |  | (1,929 | ) |  | — |  |  | — |  |  | 335,446 |  |  | (1,929 | )
Total securities available-for-sale |  | $ | 484,079 |  |  | $ | (5,181 | ) |  | $ | 424,461 |  |  | $ | (32,737 | ) |  | $ | 908,540 |  |  | $ | (37,918 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | $ | 4,880 |  |  | $ | (35 | ) |  | $ | 470,092 |  |  | $ | (15,301 | ) |  | $ | 474,972 |  |  | $ | (15,336 | )
Non-agency residential mortgage-backed securities |  | — |  |  | — |  |  | 148 |  |  | (1 | ) |  | 148 |  |  | (1 | )
Collateralized loan obligations |  | 104,334 |  |  | (266 | ) |  | — |  |  | — |  |  | 104,334 |  |  | (266 | )
Total securities available-for-sale |  | $ | 109,214 |  |  | $ | (301 | ) |  | $ | 470,240 |  |  | $ | (15,302 | ) |  | $ | 579,454 |  |  | $ | (15,603 | )

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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