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Investment Securities - Additional Information (Detail) $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 03, 2021 USD ($)	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) security
Schedule of Investments [Line Items]
Unrealized gain (loss) on investment securities		$ 1,700	$ 1,200	$ 2,700	$ (200)
Proceed from sales of foreign subsidiaries				3,765	0
Loss on sale of foreign subsidiaries		2,840	0	2,840	0
Proceeds from sales of investment securities available for sale		53,700	109,200	407,587	109,207
Realized gain		$ 1,800	$ 4,400	$ 25,400	$ 8,300
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security		38		38
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security		0		0
Number of available-for-sale investment securities, unrealized loss position | security						16
Pledged investment securities fair value		$ 16,000		$ 16,000		$ 18,800
CB Green Ventures Pte Ltd. and CUBI India Ventures Pte Ltd
Schedule of Investments [Line Items]
Proceed from sales of foreign subsidiaries	$ 3,800
Loss on sale of foreign subsidiaries	$ 2,800

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