ADVANCES FROM THE FEDERAL HOME LOAN BANK (FHLB) - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal Home Loan Bank, Advances [Line Items]
Additional capacity on credit facility based on collateral pledged	$ 978,300
Average balance during the year	541,000	$ 179,500
Estimated value of U.S. government-sponsored agencies' obligations and U.S. agencies MBS pledged as collateral amount	454,000	238,100
Loans held for investment	12,185,483	11,552,825
Proceeds from long-term borrowings	300,000	200,000	$ 0
Asset Pledged as Collateral [Member]
Federal Home Loan Bank, Advances [Line Items]
Loans held for investment	4,600,000	4,300,000
Maximum [Member]
Federal Home Loan Bank, Advances [Line Items]
Maximum aggregate balance of advances from the FHLB outstanding at any month-end during period	925,000	675,000
Federal Home Loan Bank Advances [Member]
Federal Home Loan Bank, Advances [Line Items]
Proceeds from long-term borrowings	$ 300,000
Fixed-rate advances from FHLB, interest rate	4.59%
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral [Member]
Federal Home Loan Bank, Advances [Line Items]
Loans pledged including collateral	$ 1,200,000	$ 1,300,000