Loans and Leases - Troubled Debt Restructured Loans (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) Investment loan	Dec. 31, 2019 USD ($) loan Investment
Accrual Troubled Debt Restructuring Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans \| loan	0	1
Pre-restructuring outstanding recorded investment	$ 0	$ 55
Post-restructuring outstanding recorded investment	$ 0	$ 55
Nonaccrual Troubled Debt Restructured Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans \| loan	2	6
Pre-restructuring outstanding recorded investment	$ 1,163	$ 13,889
Post-restructuring outstanding recorded investment	$ 1,163	$ 13,889
Real Estate-Residential Secured for Personal Purpose [Member] \| Accrual Troubled Debt Restructuring Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans \| Investment	0	1
Pre-restructuring outstanding recorded investment	$ 0	$ 55
Post-restructuring outstanding recorded investment	$ 0	$ 55
Real Estate-Residential Secured for Personal Purpose [Member] \| Nonaccrual Troubled Debt Restructured Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans \| loan	1	0
Pre-restructuring outstanding recorded investment	$ 544	$ 0
Post-restructuring outstanding recorded investment	$ 544	$ 0
Commercial, Financial and Agricultural [Member] \| Nonaccrual Troubled Debt Restructured Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans \| loan	1	4
Pre-restructuring outstanding recorded investment	$ 619	$ 1,475
Post-restructuring outstanding recorded investment	$ 619	$ 1,475
Real Estate-Commercial [Member] \| Nonaccrual Troubled Debt Restructured Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans \| loan	0	2
Pre-restructuring outstanding recorded investment	$ 0	$ 12,414
Post-restructuring outstanding recorded investment	$ 0	$ 12,414

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

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- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

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