INVESTMENT SECURITIES - Summary of Held-to-Maturity Debt Securities by Stated Maturity (Detail) $ in Thousands	Jun. 30, 2024 USD ($)
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 962,799
Fair Value	908,075
Asset-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	446,070
Fair Value	445,703
Agency-guaranteed residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	6,960
Fair Value	6,111
Agency-guaranteed commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	1,810
Fair Value	1,493
Agency-guaranteed residential collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	178,761
Fair Value	160,724
Agency-guaranteed commercial collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	145,173
Fair Value	123,274
Private label collateralized mortgage obligations
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	184,025
Fair Value	$ 170,770