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Fair Value Measurements - Additional Quantitative Information (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually	$ 20,246	$ 37,079
OREO	4,571	3,057	$ 376
Non-recurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO	106	55
Bank property held for sale	$ 10,676	$ 4,004
Loans evaluated individually (percent)	2,771	2,686
Non-recurring basis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO	$ 106	$ 55
Bank property held for sale	$ 10,676	$ 4,004
Loans evaluated individually (percent)	2,771	2,686
Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually	$ 2,771	$ 2,686
Non-recurring basis | Level 3 | Appraisal of collateral | OREO
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO	106	55
Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale	$ 10,676	$ 4,004
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually (percent)	(0.300)	(0.029)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually (percent)	(1)	(1)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Loans evaluated individually | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans evaluated individually (percent)	(0.370)	(0.578)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(0.250)	(0.250)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(1)	(1)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(0.545)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | OREO | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)		(0.650)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale (percent)	(0.062)	(0.062)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale (percent)	(0.649)	(0.713)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral or real estate listing price | Bank property held for sale | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Bank property held for sale (percent)	(0.428)	(0.407)

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The fair value of bank property held for sale.

+ References

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Value of input used to measure alternative investment.

+ 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)
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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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-Paragraph 14A
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Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

+ References

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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