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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Due in one year or less, amortized cost	$ 0
Due after one years through five years, amortized cost	140,681
Due after five through ten years, amortized cost	142,991
Due after ten years, amortized cost	9,935
Amortized Cost	1,429,715	$ 1,174,188
Due in one year or less, fair value	0
Due after one years through five years, fair value	141,641
Due after five through ten years, fair value	144,893
Due after ten years, fair value	9,970
Total Debt Securities Fair Value	1,437,077	1,206,431
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	381,525
Amortized Cost	381,525	372,640
Debt securities, available-for-sale, without single maturity date, fair value	386,993
Total Debt Securities Fair Value	386,993	377,145
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	162,998
Amortized Cost	162,998	32,367
Debt securities, available-for-sale, without single maturity date, fair value	163,094
Total Debt Securities Fair Value	163,094	32,367
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	13,059
Amortized Cost	13,059
Debt securities, available-for-sale, without single maturity date, fair value	13,059
Total Debt Securities Fair Value	13,059
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	37,933
Amortized Cost	37,933	61,178
Debt securities, available-for-sale, without single maturity date, fair value	37,634
Total Debt Securities Fair Value	37,634	63,091
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	329,367
Amortized Cost	329,367	136,943
Debt securities, available-for-sale, without single maturity date, fair value	328,689
Total Debt Securities Fair Value	328,689	136,992
Agency-guaranteed collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, without single maturity date, amortized cost	211,226
Amortized Cost	211,226	160,950
Debt securities, available-for-sale, without single maturity date, fair value	211,104
Total Debt Securities Fair Value	$ 211,104	$ 161,767

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