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Loans and Allowance for Loan Losses - Acquired Loans Included in Consolidated Statement of Condition (Detail) - Bay Bank and Virginia Community Bankshares, Inc., [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Outstanding principal balance	$ 985,975	$ 98,579
Recorded investment	968,988	97,402
PCI Loans [Member]
Financing Receivable Impaired [Line Items]
Outstanding principal balance	108,220	1,278
Recorded investment	94,163	1,085
Purchased Performing Loans [Member]
Financing Receivable Impaired [Line Items]
Outstanding principal balance	877,755	97,301
Recorded investment	$ 874,825	$ 96,317

X

- Definition

The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538

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X

- Definition

The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538

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-Section 50
-Paragraph 2
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- Definition

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No definition available.

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