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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2019
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, 2019 |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | $ | 40,374 |  |  | $ | — |  |  | $ | — |  |  | $ | 40,374 |
Non-agency residential mortgage-backed securities |  | 267 |  |  | 10 |  |  | — |  |  | 277 |
Collateralized loan obligations |  | 748,605 |  |  | — |  |  | (13,594 | ) |  | 735,011 |
Total securities available-for-sale |  | $ | 789,246 |  |  | $ | 10 |  |  | $ | (13,594 | ) |  | $ | 775,662 |
December 31, 2018 |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 911 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 910 |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | 461,987 |  |  | — |  |  | (24,545 | ) |  | 437,442 |
Non-agency residential mortgage-backed securities |  | 418 |  |  | 9 |  |  | — |  |  | 427 |
Non-agency commercial mortgage-backed securities |  | 132,199 |  |  | — |  |  | — |  |  | 132,199 |
Collateralized loan obligations |  | 1,431,171 |  |  | 141 |  |  | (9,790 | ) |  | 1,421,522 |
Total securities available-for-sale |  | $ | 2,026,686 |  |  | $ | 150 |  |  | $ | (34,336 | ) |  | $ | 1,992,500 |
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) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Gross realized gains on sales and calls of securities available-for-sale |  | $ | 71 |  |  | $ | 13 |  |  | $ | 279 |  |  | $ | 5,532 |
Gross realized losses on sales and calls of securities available-for-sale |  | (5,134 | ) |  | — |  |  | (5,134 | ) |  | — |
Net realized (losses) gains on sales and calls of securities available-for-sale |  | $ | (5,063 | ) |  | $ | 13 |  |  | $ | (4,855 | ) |  | $ | 5,532 |
Proceeds from sales and calls of securities available-for-sale |  | $ | 43,252 |  |  | $ | 283,114 |  |  | $ | 861,008 |  |  | $ | 896,070 |
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, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Collateralized loan obligations |  | $ | 435,191 |  |  | $ | (6,539 | ) |  | $ | 299,820 |  |  | $ | (7,055 | ) |  | $ | 735,011 |  |  | $ | (13,594 | )
Total securities available-for-sale |  | $ | 435,191 |  |  | $ | (6,539 | ) |  | $ | 299,820 |  |  | $ | (7,055 | ) |  | $ | 735,011 |  |  | $ | (13,594 | )
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | — |  |  | $ | — |  |  | $ | 910 |  |  | $ | (1 | ) |  | $ | 910 |  |  | $ | (1 | )
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | 13,494 |  |  | (133 | ) |  | 423,916 |  |  | (24,412 | ) |  | 437,410 |  |  | (24,545 | )
Non-agency residential mortgage-backed securities |  | 90 |  |  | — |  |  | 16 |  |  | — |  |  | 106 |  |  | — |
Collateralized loan obligations |  | 1,364,317 |  |  | (9,480 | ) |  | 32,790 |  |  | (310 | ) |  | 1,397,107 |  |  | (9,790 | )
Total securities available-for-sale |  | $ | 1,377,901 |  |  | $ | (9,613 | ) |  | $ | 457,632 |  |  | $ | (24,723 | ) |  | $ | 1,835,533 |  |  | $ | (34,336 | )
Composition, Repricing and Yield Information of Investment Securities Portfolio | The following table presents the composition and the repricing and yield information of the investment securities portfolio as of September 30, 2019:
|  | One year or less |  | More than One Year through Five Years |  | More than Five Years through Ten Years |  | More than Ten Years |  | Total
($ in thousands) |  | Fair Value |  | Weighted-Average Yield |  | Fair Value |  | Weighted-Average Yield |  | Fair Value |  | Weighted-Average Yield |  | Fair Value |  | Weighted-Average Yield |  | Fair Value |  | Weighted-Average Yield
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | $ | — |  |  | — | % |  | $ | — |  |  | — | % |  | $ | — |  |  | — | % |  | $ | 40,374 |  |  | 2.56 | % |  | $ | 40,374 |  |  | 2.56 | %
Non-agency residential mortgage-backed securities |  | 65 |  |  | 2.68 | % |  | — |  |  | — | % |  | — |  |  | — | % |  | 212 |  |  | 5.79 | % |  | 277 |  |  | 5.06 | %
Collateralized loan obligations |  | 735,011 |  |  | 3.52 | % |  | — |  |  | — | % |  | — |  |  | — | % |  | — |  |  | — | % |  | 735,011 |  |  | 3.52 | %
Total securities available-for-sale |  | $ | 735,076 |  |  | 3.52 | % |  | $ | — |  |  | — | % |  | $ | — |  |  | — | % |  | $ | 40,586 |  |  | 2.58 | % |  | $ | 775,662 |  |  | 3.47 | %

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