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INVESTMENT SECURITIES - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 41,523
Due after one year through five years, amortized cost	531,379
Due after five years through ten years, amortized cost	87,724
Amortized Cost	2,488,717	$ 2,524,663
Due in one year or less, fair value	29,940
Due after one year through five years, fair value	484,726
Due after five years through ten years, fair value	80,305
Fair Value	2,377,733	2,376,860
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	40,179
Amortized Cost	40,179	97,359
Debt securities, available-for-sale, without single maturity date, fair value	37,670
Fair Value	37,670	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	216,821
Amortized Cost	216,821
Debt securities, available-for-sale, without single maturity date, fair value	221,178
Fair Value	221,178
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	201,529
Amortized Cost	201,529	129,589
Debt securities, available-for-sale, without single maturity date, fair value	194,873
Fair Value	194,873	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	96,200
Amortized Cost	96,200
Debt securities, available-for-sale, without single maturity date, fair value	96,943
Fair Value	96,943
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	315,096
Amortized Cost	315,096	500,109
Debt securities, available-for-sale, without single maturity date, fair value	310,429
Fair Value	310,429	489,092
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	78,711
Amortized Cost	78,711	125,885
Debt securities, available-for-sale, without single maturity date, fair value	77,074
Fair Value	77,074	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	879,555
Amortized Cost	879,555	1,034,841
Debt securities, available-for-sale, without single maturity date, fair value	844,595
Fair Value	$ 844,595	$ 973,561

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