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Investment Securities - Summary of Investment Securities by Stated Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost, due in one year or less	$ 4,000
Amortized cost, due after one year through five years	576,918
Amortized cost, due after five years through ten years	55,962
Amortized Cost	2,524,663	$ 3,138,534
Fair value, due in one year or less	3,851
Fair value, due after one year through five years	532,411
Fair value, due after five years through ten years	46,772
Fair Value	2,376,860	2,961,015
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	97,359
Amortized Cost	97,359	169,170
Debt securities without single maturity date, fair value	92,629
Fair Value	92,629	160,542
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	129,589
Amortized Cost	129,589	147,481
Debt securities without single maturity date, fair value	116,908
Fair Value	116,908	133,864
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	500,109
Amortized Cost	500,109	896,992
Debt securities without single maturity date, fair value	489,092
Fair Value	489,092	872,738
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	125,885
Amortized Cost	125,885	142,222
Debt securities without single maturity date, fair value	121,636
Fair Value	121,636	136,357
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	1,034,841
Amortized Cost	1,034,841	1,125,583
Debt securities without single maturity date, fair value	973,561
Fair Value	$ 973,561	$ 1,062,261

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