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INVESTMENT SECURITIES - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) security | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) security | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
OTTI on investment securities | $ 731,000 | $ 0 |  | $ 3,300,000 | $ 0 |  | $ 731,000 | $ 0
Gross realized gains on sales and calls of securities available-for-sale | 71,000 |  |  |  | 13,000 |  | 279,000 | 5,532,000
Loss on sale of securities | $ 5,134,000 |  |  |  | $ 0 |  | $ 5,134,000 | $ 0
Securities available for sale portfolio | security | 57 |  |  | 145 |  |  | 57 |
Available for sale securities in unrealized loss position | security | 45 |  |  | 118 |  |  | 45 |
Collateral Pledged |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securities pledged | $ 64,600,000 |  |  | $ 163,000,000.0 |  |  | $ 64,600,000 |
Collateralized loan obligations |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securities sold | 0 |  | $ 132,200,000 |  |  |  | 644,500,000 |
Gross realized gains on sales and calls of securities available-for-sale | 0 |  | $ 9,000 |  |  |  | 143,000 |
Non-agency commercial mortgage-backed securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securities sold | 380,900,000 |  |  |  |  |  | 385,800,000 |
Loss on sale of securities | $ 5,100,000 |  |  |  |  |  | $ 5,000,000.0 |
Corporate debt securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Securities sold |  |  |  |  |  | $ 76,800,000 |  |
Gross realized gains on sales and calls of securities available-for-sale |  |  |  |  |  | $ 4,900,000 |  |
Non-agency residential mortgage-backed securities |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |
Available for sale securities in unrealized loss position | security | 9 |  |  |  |  |  | 9 |

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