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Revenue from Contracts with Customers - Summary of Total Non-interest Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	$ 3,176	$ 2,203
Non-interest income within scope of other ASC topics	53,648	16,593
Total non-interest income	56,824	18,796
Service Fees on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	905	651
Bank and Purchase Card Revenue [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	1,297	572
Payroll Processing Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contracts with customers	$ 974	$ 980

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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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