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Loans and Allowance for Credit Losses - TDR Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 loan	Sep. 30, 2020 loan	Sep. 30, 2021 USD ($) loan contract	Sep. 30, 2020 USD ($) loan contract
Loans and Leases Receivable Disclosure [Line Items]
Number of TDR loans | contract			7	11
Troubled debt restructuring, amount			$ 16,537	$ 19,372
Restructured and subsequently defaulted			$ 6,342	$ 13,669
Number of loans - restructured accruing	1	1	5	7
Number of loans paydowns | loan			0	0
Number of contracts modified in TDR | loan			0	2
Performing Financial Instruments
Loans and Leases Receivable Disclosure [Line Items]
Number of TDR loans | contract			5
Troubled debt restructuring, amount			$ 10,200
Non-Performing Loans
Loans and Leases Receivable Disclosure [Line Items]
Number of loans subsequent defaults reclassified to non-performing | loan			0	2
Restructured and subsequently defaulted				$ 6,300

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

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The number of loan paydowns during the period.

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Number of TDR loans that defaulted on their modified terms and reclassified to non-performing loans.

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- Definition

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=123577603&loc=SL6953676-111524

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

+ 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=123577603&loc=SL6953676-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

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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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