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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,046,179 | $ 929,449
Gross Unrealized Gains | 5,335 | 151
Gross Unrealized Losses | (82,087) | (17,020)
Fair Value | 969,427 | 912,580
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 100,971 | 37,613
Gross Unrealized Gains | 3,050 | 0
Gross Unrealized Losses | 0 | (1,157)
Fair Value | 104,021 | 36,456
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 140,797 | 91,543
Gross Unrealized Gains | 299 | 16
Gross Unrealized Losses | (1,677) | (260)
Fair Value | 139,419 | 91,299
Municipal securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 52,985 | 52,997
Gross Unrealized Gains | 1,400 | 51
Gross Unrealized Losses | 0 | (359)
Fair Value | 54,385 | 52,689
Non-agency residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 163 | 191
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | (3) | 0
Fair Value | 160 | 196
Collateralized loan obligations |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 703,605 | 733,605
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (80,034) | (15,244)
Fair Value | 623,571 | 718,361
Corporate debt securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 47,658 | 13,500
Gross Unrealized Gains | 586 | 79
Gross Unrealized Losses | (373) | 0
Fair Value | $ 47,871 | $ 13,579

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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