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Investment Securities - Summary of Investment Securities by Stated Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost, due in one year or less	$ 21,465
Amortized cost, due after one year through five years	507,162
Amortized cost, due after five years through ten years	128,459
Amortized Cost	3,138,534	$ 3,799,851
Fair value, due in one year or less	21,499
Fair value, due after one year through five years	460,649
Fair value, due after five years through ten years	113,105
Fair Value	2,961,015	3,791,575
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	169,170
Amortized Cost	169,170	297,291
Debt securities without single maturity date, fair value	160,542
Fair Value	160,542	297,425
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	896,992
Amortized Cost	896,992	1,067,770
Debt securities without single maturity date, fair value	872,738
Fair Value	872,738	1,066,802
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	142,222
Amortized Cost	142,222	149,054
Debt securities without single maturity date, fair value	136,357
Fair Value	136,357	148,927
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	147,481
Amortized Cost	147,481	199,091
Debt securities without single maturity date, fair value	133,864
Fair Value	133,864	196,930
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	1,125,583
Amortized Cost	1,125,583	1,248,142
Debt securities without single maturity date, fair value	1,062,261
Fair Value	$ 1,062,261	$ 1,242,465

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