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Non-Performing Assets Including Troubled Debt Restructurings (TDR) - Additional information (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
ALL reserve for TDR's	$ 135,000	$ 103,000
Decrease in loan modifications to COVID-19	$ 33,300,000
Percentage of decrease in balance of loan modifications	67.90%
Accrued interest receivable due to loan modification	$ 939,000,000,000
Number of loans | loan	27	70
Commercial real estate and commercial loan portfolios
Number of loans | loan	5
Second payment deferral
Balance of loans modified	$ 15,000,000
Complete payment deferrals
Number of loans | loan	22	59

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The amount of accrued interest receivable due to loan modification.

+ References

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- Definition

Allowance for loan and lease losses pertaining to troubled debt restructurings.

+ References

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- Definition

Amount of financing receivable modified in response to COVID-19.

+ References

No definition available.

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- Definition

Number of financing receivables that have been modified in response to COVID-19.

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- Definition

Percentage of increase (decrease) in financing receivable modified from to COVID-19.

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- Definition

Amount of increase (decrease) in financing receivable modified from troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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