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INVESTMENT SECURITIES - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 35,523
Due after one year through five years, amortized cost	532,571
Due after five years through ten years, amortized cost	87,665
Amortized Cost	2,622,526	$ 2,524,663
Due in one year or less, fair value	26,273
Due after one year through five years, fair value	482,410
Due after five years through ten years, fair value	79,062
Fair Value	2,477,758	2,376,860
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	50,517
Amortized Cost	50,517	97,359
Debt securities, available-for-sale, without single maturity date, fair value	47,112
Fair Value	47,112	92,629
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	198,732
Amortized Cost	198,732
Debt securities, available-for-sale, without single maturity date, fair value	199,487
Fair Value	199,487
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	181,750
Amortized Cost	181,750	129,589
Debt securities, available-for-sale, without single maturity date, fair value	169,512
Fair Value	169,512	116,908
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	83,180
Amortized Cost	83,180
Debt securities, available-for-sale, without single maturity date, fair value	81,818
Fair Value	81,818
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	412,452
Amortized Cost	412,452	500,109
Debt securities, available-for-sale, without single maturity date, fair value	406,033
Fair Value	406,033	489,092
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	100,610
Amortized Cost	100,610	125,885
Debt securities, available-for-sale, without single maturity date, fair value	99,022
Fair Value	99,022	121,636
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	939,526
Amortized Cost	939,526	1,034,841
Debt securities, available-for-sale, without single maturity date, fair value	887,029
Fair Value	$ 887,029	$ 973,561

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