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Business Combination and Asset Purchase - Summary of Loans Acquired and Contractually Required Payments Receivable (Detail) $ in Thousands	Sep. 30, 2020 USD ($)
Business Acquisition [Line Items]
Total required payments receivable	$ 4,570
Cash flows expected to be collected at acquisition	2,788
Basis in acquired loans at acquisition	4,396
Commercial [Member]
Business Acquisition [Line Items]
Total required payments receivable	4,215
Consumer RE [Member]
Business Acquisition [Line Items]
Total required payments receivable	261
Consumer [Member]
Business Acquisition [Line Items]
Total required payments receivable	$ 94

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Fair value at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of contractually required payments receivable at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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