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Loans and Allowance for Credit Losses Narrative (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans with principal balances approximately in percentage	92.00%		83.00%
Unpaid principal balance, with no related allowance	$ 53,197		$ 68,595
Excluded from TDRs	3,300,000	$ 3,800,000
COVID-19 Deferral Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Excluded from TDRs	65,100
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance of loans evaluated individually for impairment	1,000		$ 1,000
Impaired loans balances, real estate as collateral	$ 1,000

X

- Definition

Financing Receivable, Troubled Debt Restructuring, Postmodification, Excluded

+ References

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X

- Definition

Represents the maximum balance of impaired loans that are pooled and evaluated collectively for impairment, rather than individually evaluated for impairment.

+ References

No definition available.

+ Details

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- Definition

Represents the minimum principal balance threshold for disclosing impaired loans primarily secured by real estate that were measured at estimated fair value using certified third party appraisals updated in the previous 12 months.

+ References

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- Definition

Percentage of impaired loans primarily collateralized by real estate with principal balances greater than $1 million that were measured at estimated fair value using certified third party appraisals that had been updated in the previous 12 months.

+ References

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- Definition

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.

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- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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