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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 4,901
Due after one years through five years, amortized cost	211,508
Due after five through ten years, amortized cost	154,043
Due after ten years, amortized cost	4,000
Amortized Cost	1,520,523	$ 1,174,188
Due in one year or less, fair value	5,032
Due after one years through five years, fair value	212,586
Due after five through ten years, fair value	157,219
Due after ten years, fair value	4,252
Total Debt Securities Fair Value	1,526,792	1,206,431
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	319,682
Amortized Cost	319,682	372,640
Debt securities, available-for-sale, without single maturity date, fair value	322,954
Total Debt Securities Fair Value	322,954	377,145
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	162,960
Amortized Cost	162,960	32,367
Debt securities, available-for-sale, without single maturity date, fair value	162,927
Total Debt Securities Fair Value	162,927	32,367
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	23,054
Amortized Cost	23,054
Debt securities, available-for-sale, without single maturity date, fair value	23,087
Total Debt Securities Fair Value	23,087
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	10,620
Amortized Cost	10,620	61,178
Debt securities, available-for-sale, without single maturity date, fair value	10,355
Total Debt Securities Fair Value	10,355	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	2,206
Amortized Cost	2,206
Debt securities, available-for-sale, without single maturity date, fair value	2,205
Total Debt Securities Fair Value	2,205
Agency-guaranteed residential collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	81,007
Amortized Cost	81,007	139,985
Debt securities, available-for-sale, without single maturity date, fair value	81,758
Total Debt Securities Fair Value	81,758	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	144,593
Amortized Cost	144,593	20,965
Debt securities, available-for-sale, without single maturity date, fair value	142,841
Total Debt Securities Fair Value	142,841	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	401,949
Amortized Cost	401,949	136,943
Debt securities, available-for-sale, without single maturity date, fair value	401,576
Total Debt Securities Fair Value	$ 401,576	$ 136,992

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