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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 4,932
Due after one years through five years, amortized cost	280,813
Due after five through ten years, amortized cost	156,973
Due after ten years, amortized cost	3,000
Amortized Cost	1,860,529	$ 1,174,188
Due in one year or less, fair value	5,022
Due after one years through five years, fair value	282,050
Due after five through ten years, fair value	159,475
Due after ten years, fair value	3,000
Total Debt Securities Fair Value	1,861,697	1,206,431
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	225,182
Amortized Cost	225,182	372,640
Debt securities, available-for-sale, without single maturity date, fair value	225,457
Total Debt Securities Fair Value	225,457	377,145
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	315,501
Amortized Cost	315,501	32,367
Debt securities, available-for-sale, without single maturity date, fair value	315,502
Total Debt Securities Fair Value	315,502	32,367
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	28,035
Amortized Cost	28,035
Debt securities, available-for-sale, without single maturity date, fair value	28,088
Total Debt Securities Fair Value	28,088
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	9,924
Amortized Cost	9,924	61,178
Debt securities, available-for-sale, without single maturity date, fair value	9,666
Total Debt Securities Fair Value	9,666	63,091
Agency-guaranteed commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	2,184
Amortized Cost	2,184
Debt securities, available-for-sale, without single maturity date, fair value	2,194
Total Debt Securities Fair Value	2,194
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	102,110
Amortized Cost	102,110	139,985
Debt securities, available-for-sale, without single maturity date, fair value	102,194
Total Debt Securities Fair Value	102,194	140,841
Agency-guaranteed commercial collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	143,858
Amortized Cost	143,858	20,965
Debt securities, available-for-sale, without single maturity date, fair value	141,808
Total Debt Securities Fair Value	141,808	20,926
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	588,017
Amortized Cost	588,017	136,943
Debt securities, available-for-sale, without single maturity date, fair value	587,241
Total Debt Securities Fair Value	$ 587,241	$ 136,992

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