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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,429,715	$ 1,174,188
Gross Unrealized Gains	11,028	32,890
Gross Unrealized Losses	(3,666)	(647)
Fair Value	1,437,077	1,206,431
Equity securities	4,827	3,854
Investment securities, at fair value	1,441,904	1,210,285
Available-for-sale debt securities, accrued interest	4,300	4,200
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	381,525	372,640
Gross Unrealized Gains	5,717	4,515
Gross Unrealized Losses	(249)	(10)
Fair Value	386,993	377,145
U.S. government agencies securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,000	20,000
Gross Unrealized Gains	53	34
Gross Unrealized Losses	0	0
Fair Value	20,053	20,034
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,933	61,178
Gross Unrealized Gains	9	1,913
Gross Unrealized Losses	(308)	0
Fair Value	37,634	63,091
Agency-guaranteed collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	211,226	160,950
Gross Unrealized Gains	365	916
Gross Unrealized Losses	(487)	(99)
Fair Value	211,104	161,767
Collateralized loan obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	162,998	32,367
Gross Unrealized Gains	139	0
Gross Unrealized Losses	(43)	0
Fair Value	163,094	32,367
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,059
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	13,059
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	255,126	372,764
Gross Unrealized Gains	3,422	24,144
Gross Unrealized Losses	(624)	(164)
Fair Value	257,924	396,744
Private label collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	329,367	136,943
Gross Unrealized Gains	1,277	423
Gross Unrealized Losses	(1,955)	(374)
Fair Value	328,689	136,992
State and political subdivision debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,481	17,346
Gross Unrealized Gains	46	945
Gross Unrealized Losses	0	0
Fair Value	$ 18,527	$ 18,291

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