LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Loans held for investment	$ 11,060,658	$ 11,777,289
Allowance for loan and lease losses	(269,030)	(385,887)	$ (155,139)	$ (196,362)
Loans, net of allowance for credit losses	10,791,628	11,391,402
Residential Portfolio Segment [Member]
Loans held for investment	2,978,895	3,521,954
Allowance for loan and lease losses	(74,837)	(120,311)	(44,806)	(50,794)
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member]
Loans held for investment	2,887,251	3,202,590
Allowance for loan and lease losses	(34,284)	(37,944)	(15,198)	(32,546)
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Loans held for investment	2,167,469	2,230,602
Allowance for loan and lease losses	(52,771)	(109,342)	(39,194)	(55,581)
Commercial Portfolio Segment [Member] | Construction loans [Member]
Loans held for investment	138,999	212,500
Allowance for loan and lease losses	(4,048)	(5,380)	(2,370)	(3,592)
Consumer Portfolio Segment [Member]
Loans held for investment	2,888,044	2,609,643
Allowance for loan and lease losses	$ (103,090)	$ (112,910)	$ (53,571)	$ (53,849)