Loans and Leases - Accruing and Nonaccruing Troubled Debt Restructured Loans with Payment Defaults (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Financing Receivables Troubled Debt Restructurings That Subsequently Defaulted [Abstract]
Number of loans \| loan	0	0	0	0
Pre-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Post-restructuring outstanding recorded investment	$ 0	$ 0	$ 0	$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member]
Financing Receivables Troubled Debt Restructurings That Subsequently Defaulted [Abstract]
Number of loans \| loan	3	1	3	2
Pre-restructuring outstanding recorded investment	$ 200	$ 544	$ 200	$ 1,163
Post-restructuring outstanding recorded investment	$ 198	$ 544	$ 198	$ 1,163
Nonaccrual Troubled Debt Restructuring Loans [Member] \| Real-Estate Commercial [Member]
Financing Receivables Troubled Debt Restructurings That Subsequently Defaulted [Abstract]
Number of loans \| loan	3	0	3	0
Pre-restructuring outstanding recorded investment	$ 200	$ 0	$ 200	$ 0
Post-restructuring outstanding recorded investment	$ 198	$ 0	$ 198	$ 0
Nonaccrual Troubled Debt Restructuring Loans [Member] \| Real Estate Residential Secured For Personal Purpose [Member]
Financing Receivables Troubled Debt Restructurings That Subsequently Defaulted [Abstract]
Number of loans \| loan	0	1	0	1
Pre-restructuring outstanding recorded investment	$ 0	$ 544	$ 0	$ 544
Post-restructuring outstanding recorded investment	$ 0	$ 544	$ 0	$ 544
Nonaccrual Troubled Debt Restructuring Loans [Member] \| Commercial Financial And Agricultural [Member]
Financing Receivables Troubled Debt Restructurings That Subsequently Defaulted [Abstract]
Number of loans \| loan			0	1
Pre-restructuring outstanding recorded investment			$ 0	$ 619
Post-restructuring outstanding recorded investment			$ 0	$ 619

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

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=123577603&loc=SL6953676-111524

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

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

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Accruing and nonaccrual troubled debt restructured loans for which there was a payment default in the current reporting period and within 12 months following restructuring.

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