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INVESTMENT SECURITIES - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) security | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) security | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Jun. 30, 2019 USD ($) security | Jun. 30, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
OTTI on investment securities | $ 0 |  | $ 3,300,000 | $ 0 |  | $ 0 | $ 0
Gross realized gains on sales and calls of securities available-for-sale | $ 0 |  |  | $ 278,000 |  | $ 208,000 | $ 5,519,000
Securities available for sale portfolio | security | 82 |  | 145 |  |  | 82 |
Available for sale securities in unrealized loss position | security | 64 |  | 118 |  |  | 64 |
Collateral Pledged |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Securities pledged | $ 106,300,000 |  | $ 163,000,000.0 |  |  | $ 106,300,000 |
Collateralized loan obligations |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Securities sold | 279,200,000 | $ 132,200,000 |  |  |  | 644,500,000 |
Gross realized gains on sales and calls of securities available-for-sale | $ 0 | $ 9,000 |  |  |  | $ 143,000 |
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 |  |

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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