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Fair Value - Narrative (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option, loans held as assets, 90 days or more past due	$ 0	$ 0
Fair value option, loans held as assets, aggregate amount in nonaccrual status	$ 0	$ 0
Significant Unobservable Inputs (Level 3) | Pull-Through Rate | Fair Value, Recurring | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Banking Derivative Assets, pull-through rate (in percentage)	0.80
Mortgage Banking Derivative Liabilities, pull-through rate (in percentage)	0.80
Significant Unobservable Inputs (Level 3) | Pull-Through Rate | Fair Value, Recurring | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage Banking Derivative Assets, pull-through rate (in percentage)	0.85
Mortgage Banking Derivative Liabilities, pull-through rate (in percentage)	0.85

X

- Definition

Value of input used to measure derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Value of input used to measure derivative liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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+ References

No definition available.

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- Definition

This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=123596393&loc=d3e14064-108612

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- Definition

This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
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