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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Discontinued Operations, Disposed of by Sale | Banc Home Loan
Total gains or losses (realized/unrealized):
Loans held-for-sale, carried at fair value	$ 0		$ 19,500
Recurring | Significant Unobservable Inputs (Level 3) | Discontinued Operations, Disposed of by Sale | Banc Home Loan
Total gains or losses (realized/unrealized):
Loans held-for-sale, carried at fair value	0		17,400
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	25,040	$ 98,940
Total gains or losses (realized/unrealized):
Included in earnings—fair value adjustment	3	(6)
Additions	0	24,620
Sales, paydowns, settlements, and other	(1,974)	(80,592)
Balance at end of period	23,069	42,962
Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities | Discontinued Operations, Disposed of by Sale | Banc Home Loan
Total gains or losses (realized/unrealized):
Loans held-for-sale, carried at fair value	$ 0	$ 24,000	$ 17,300	$ 32,300

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