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Investment Securities - Summary of Investment Securities by Stated Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost, due in one year or less	$ 0
Amortized cost, due after one year through five years	93,111
Amortized cost, due after five years through ten years	295,653
Amortized cost, due after ten years	21,346
Amortized Cost	1,174,188	$ 557,891
Fair value, due in one year or less	0
Fair value, due after one year through five years	94,169
Fair value, due after five years through ten years	318,588
Fair value, due after ten years	22,312
Fair Value	1,206,431	577,198
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	372,640
Amortized Cost	372,640
Debt securities without single maturity date, fair value	377,145
Fair Value	377,145
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	32,367
Amortized Cost	32,367
Debt securities without single maturity date, fair value	32,367
Fair Value	32,367
Agency-guaranteed mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	61,178
Amortized Cost	61,178	273,252
Debt securities without single maturity date, fair value	63,091
Fair Value	63,091	$ 278,321
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	136,943
Amortized Cost	136,943
Debt securities without single maturity date, fair value	136,992
Fair Value	136,992
Agency-guaranteed collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Debt securities without single maturity date, amortized cost	160,950
Amortized Cost	160,950
Debt securities without single maturity date, fair value	161,767
Fair Value	$ 161,767

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