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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Fair Value of 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 |  |
December 31, 2021 |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 14,679 |  |  | $ | — |  |  | $ | (88) |  |  | $ | 14,591 |  |  |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | 190,382 |  |  | 2,898 |  |  | (1,311) |  |  | 191,969 |  |  |
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  | 242,458 |  |  | 1,171 |  |  | (2,088) |  |  | 241,541 |  |  |
Municipal securities |  | 117,913 |  |  | 2,641 |  |  | (1,539) |  |  | 119,015 |  |  |
Non-agency residential mortgage-backed securities |  | 56,014 |  |  | 11 |  |  | — |  |  | 56,025 |  |  |
Collateralized loan obligations |  | 521,275 |  |  | — |  |  | (2,311) |  |  | 518,964 |  |  |
Corporate debt securities |  | 162,002 |  |  | 11,603 |  |  | (7) |  |  | 173,598 |  |  |
Total securities available-for-sale |  | $ | 1,304,723 |  |  | $ | 18,324 |  |  | $ | (7,344) |  |  | $ | 1,315,703 |  |  |
December 31, 2020 |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 17,436 |  |  | $ | — |  |  | $ | (82) |  |  | $ | 17,354 |  |  |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | 99,591 |  |  | 6,793 |  |  | $ | — |  |  | 106,384 |  |  |
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  | 209,426 |  |  | 2,571 |  |  | (166) |  |  | 211,831 |  |  |
Municipal securities |  | 64,355 |  |  | 4,272 |  |  | (4) |  |  | 68,623 |  |  |
Non-agency residential mortgage-backed securities |  | 156 |  |  | 4 |  |  | — |  |  | 160 |  |  |
Collateralized loan obligations |  | 687,505 |  |  | — |  |  | (9,720) |  |  | 677,785 |  |  |
Corporate debt securities |  | 141,975 |  |  | 7,319 |  |  | — |  |  | 149,294 |  |  |
Total securities available-for-sale |  | $ | 1,220,444 |  |  | $ | 20,959 |  |  | $ | (9,972) |  |  | $ | 1,231,431 |  |  |
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:
|  | Year Ended December 31,
($ in thousands) |  | 2021 |  | 2020 |  | 2019
Gross realized gains on sales and calls of securities available-for-sale |  | $ | — |  |  | $ | 2,011 |  |  | $ | 556 |
Gross realized losses on sales and calls of securities available-for-sale |  | — |  |  | — |  |  | (5,408) |
Net realized gains (losses) on sales and calls of securities available-for-sale |  | $ | — |  |  | $ | 2,011 |  |  | $ | (4,852) |
Proceeds from sales and calls of securities available-for-sale |  | $ | 191,230 |  |  | $ | 68,829 |  |  | $ | 1,249,588 |
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
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | — |  |  | $ | — |  |  | $ | 14,591 |  |  | $ | (88) |  |  | $ | 14,591 |  |  | $ | (88) |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | 67,588 |  |  | (1,311) |  |  | — |  |  | — |  |  | 67,588 |  |  | (1,311) |
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  | 85,290 |  |  | (1,184) |  |  | 17,754 |  |  | (904) |  |  | 103,044 |  |  | (2,088) |
Municipal securities |  | 44,748 |  |  | (919) |  |  | 10,762 |  |  | (620) |  |  | 55,510 |  |  | (1,539) |
Collateralized loan obligations |  | 81,962 |  |  | (38) |  |  | 253,002 |  |  | (2,273) |  |  | 334,964 |  |  | (2,311) |
Corporate debt securities |  | 4,993 |  |  | (7) |  |  | — |  |  | — |  |  | 4,993 |  |  | (7) |
Total securities available-for-sale |  | $ | 284,581 |  |  | $ | (3,459) |  |  | $ | 296,109 |  |  | $ | (3,885) |  |  | $ | 580,690 |  |  | $ | (7,344) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 17,354 |  |  | $ | (82) |  |  | $ | — |  |  | $ | — |  |  | $ | 17,354 |  |  | $ | (82) |
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  | 19,033 |  |  | (166) |  |  | — |  |  | — |  |  | 19,033 |  |  | (166) |
Municipal securities |  | 11,401 |  |  | (4) |  |  | — |  |  | — |  |  | 11,401 |  |  | (4) |
Collateralized loan obligations |  | 64,775 |  |  | (225) |  |  | 613,010 |  |  | (9,495) |  |  | 677,785 |  |  | (9,720) |
Total securities available-for-sale |  | $ | 112,563 |  |  | $ | (477) |  |  | $ | 613,010 |  |  | $ | (9,495) |  |  | $ | 725,573 |  |  | $ | (9,972) |
Summary of Composition and Repricing and Yield Information | The following table presents the fair value and yield information of the investment securities portfolio, based on the earlier of maturity dates or next repricing date, as of December 31, 2021:
|  | 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SBA loan pool securities |  | $ | 14,591 |  |  | 0.91 | % |  | $ | — |  |  | — | % |  | $ | — |  |  | — | % |  | $ | — |  |  | — | % |  | $ | 14,591 |  |  | 0.91 | %
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  | — |  |  | — | % |  | — |  |  | — | % |  | 28,920 |  |  | 2.20 | % |  | 163,049 |  |  | 2.15 | % |  | 191,969 |  |  | 2.16 | %
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  | 97,750 |  |  | 0.64 | % |  | 10,692 |  |  | 1.95 | % |  | 41,073 |  |  | 1.33 | % |  | 92,026 |  |  | 1.84 | % |  | 241,541 |  |  | 1.27 | %
Municipal securities |  | — |  |  | — | % |  | — |  |  | — | % |  | 15,172 |  |  | 2.62 | % |  | 103,843 |  |  | 2.37 | % |  | 119,015 |  |  | 2.40 | %
Non-agency residential mortgage-backed securities |  | — |  |  | — | % |  | — |  |  | — | % |  | — |  |  | — | % |  | 56,025 |  |  | 2.51 | % |  | 56,025 |  |  | 2.51 | %
Collateralized loan obligations |  | 518,964 |  |  | 1.76 | % |  | — |  |  | — | % |  | — |  |  | — | % |  | — |  |  | — | % |  | 518,964 |  |  | 1.76 | %
Corporate debt securities |  | — |  |  | — | % |  | 155,640 |  |  | 4.76 | % |  | 17,958 |  |  | 5.73 | % |  | — |  |  | — | % |  | 173,598 |  |  | 4.85 | %
Total securities available-for-sale |  | $ | 631,305 |  |  | 1.57 | % |  | $ | 166,332 |  |  | 4.57 | % |  | $ | 103,123 |  |  | 2.42 | % |  | $ | 414,943 |  |  | 2.19 | % |  | $ | 1,315,703 |  |  | 2.19 | %

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