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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Allowance for Loan Losses
Balance at beginning of year	$ 13,672	$ 7,228	$ 7,228
Provision for loan loss	1,700	1,430	6,981
Loans charged off	(1,013)	(164)	(720)
Recoveries	66	39	183
Balance at ending of year	14,425		13,672
Allowance for Unfunded Loan Commitments & Letters of Credit	1,052		641
Total Allowance for Credit Losses	$ 15,477	$ 9,003	$ 14,313	$ 7,707

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- Definition

Allowance is intended to reflect the potential for losses that may not be funded but for which the bank has made a commitment to fund including letters of credit.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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