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INVESTMENT SECURITIES - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 20,195
Due after one year through five years, amortized cost	422,613
Due after five years through ten years, amortized cost	68,214
Due after ten years, amortized cost	7,523
Amortized Cost	2,095,218	$ 2,087,881
Due in one year or less, fair value	19,816
Due after one year through five years, fair value	391,589
Due after five years through ten years, fair value	65,011
Due after ten years, fair value	5,945
Fair Value	2,024,437	1,985,438
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	169,570
Amortized Cost	169,570	14,820
Debt securities, available-for-sale, without single maturity date, fair value	168,475
Fair Value	168,475	13,236
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	322,646
Amortized Cost	322,646	330,637
Debt securities, available-for-sale, without single maturity date, fair value	322,884
Fair Value	322,884	327,038
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	236,386
Amortized Cost	236,386	242,858
Debt securities, available-for-sale, without single maturity date, fair value	228,343
Fair Value	228,343	226,746
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	95,734
Amortized Cost	95,734	95,850
Debt securities, available-for-sale, without single maturity date, fair value	93,747
Fair Value	93,747	93,075
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	187,703
Amortized Cost	187,703	257,500
Debt securities, available-for-sale, without single maturity date, fair value	187,479
Fair Value	187,479	255,407
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	76,008
Amortized Cost	76,008	78,707
Debt securities, available-for-sale, without single maturity date, fair value	76,008
Fair Value	76,008	77,708
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	488,626
Amortized Cost	488,626	502,985
Debt securities, available-for-sale, without single maturity date, fair value	465,140
Fair Value	$ 465,140	$ 475,898

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