Fair Value Measurements - Additional Quantitative Information (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	$ 37,079	$ 50,182
OREO	3,057	376	$ 1,283
Carrying Amount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying value	25,500
Non-recurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	2,686	10,999
OREO	55	55
Bank property held for sale	4,004	1,832
Non-recurring basis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	2,686	10,999
OREO	55	55
Bank property held for sale	4,004	1,832
Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans	2,686	10,999
Non-recurring basis | Level 3 | Appraisal of collateral | OREO
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO	55	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	$ 4,004	$ 1,832
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans (percent)	(2.9)	(3.3)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans (percent)	(100.0)	(100.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | Impaired loans | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans (percent)	(57.8)	(24.1)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(25.0)	(25.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(100.0)	(100.0)
Appraisal adjustments | Non-recurring basis | Level 3 | Appraisal of collateral | OREO | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
OREO (percent)	(65.0)	(65.0)
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)	(6.2)	0.0
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)	(71.3)	(35.1)
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)	(40.7)	(28.3)