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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
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

X

- 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).

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Amount, before tax, of unrealized loss 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).

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