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Fair Value Measurements - Fair Value Measurement on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Fair value measurements of assets on a nonrecurring basis
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (77)	$ 0	$ (700)	$ (10)
Assets, Fair Value Disclosure	4,467		4,467		$ 2,635
Level 1
Fair value measurements of assets on a nonrecurring basis
Assets, Fair Value Disclosure	0		0		0
Level 2
Fair value measurements of assets on a nonrecurring basis
Assets, Fair Value Disclosure	0		0		0
Level 3
Fair value measurements of assets on a nonrecurring basis
Assets, Fair Value Disclosure	3,047		3,047		2,619
Impaired Loans
Fair value measurements of assets on a nonrecurring basis
Fair Value	2,242		2,242
Net Losses (Gains) Recorded in Earnings	(39)	0	(662)	(10)
Assets, Fair Value Disclosure	3,662		3,662
Impaired Loans | Level 1
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Level 2
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Level 3
Fair value measurements of assets on a nonrecurring basis
Fair Value	2,242		2,242		1,289
Impaired Loans | Commercial Portfolio Segment
Fair value measurements of assets on a nonrecurring basis
Fair Value	1,708		1,708
Net Losses (Gains) Recorded in Earnings	(39)	0	(624)	(10)
Assets, Fair Value Disclosure	2,671		2,671
Impaired Loans | Commercial Portfolio Segment | Level 1
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Commercial Portfolio Segment | Level 2
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Commercial Portfolio Segment | Level 3
Fair value measurements of assets on a nonrecurring basis
Fair Value	1,708		1,708
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial
Fair value measurements of assets on a nonrecurring basis
Fair Value	1,222		1,222		1,289
Net Losses (Gains) Recorded in Earnings	(54)	0	(563)	(10)
Assets, Fair Value Disclosure	2,058		2,058		1,305
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial | Level 1
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0		0
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial | Level 2
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0		0
Impaired Loans | Commercial Portfolio Segment | Commercial and Industrial | Level 3
Fair value measurements of assets on a nonrecurring basis
Fair Value	1,222		1,222		1,289
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate
Fair value measurements of assets on a nonrecurring basis
Fair Value	486		486
Net Losses (Gains) Recorded in Earnings	15	0	(61)	0
Assets, Fair Value Disclosure	613		613
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate | Level 1
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate | Level 2
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Commercial Portfolio Segment | Owner Occupied Commercial Real Estate | Level 3
Fair value measurements of assets on a nonrecurring basis
Fair Value	486		486
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Fair value measurements of assets on a nonrecurring basis
Fair Value	534		534
Net Losses (Gains) Recorded in Earnings	0	$ 0	(38)	$ 0
Assets, Fair Value Disclosure	991		991
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Level 1
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Level 2
Fair value measurements of assets on a nonrecurring basis
Fair Value	0		0
Impaired Loans | Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties | Level 3
Fair value measurements of assets on a nonrecurring basis
Fair Value	534		534
Branch held for sale
Fair value measurements of assets on a nonrecurring basis
Basis	805		805
Fair Value					1,330
Assets, Fair Value Disclosure	805		805		1,330
Branch held for sale | Level 1
Fair value measurements of assets on a nonrecurring basis
Basis	0		0
Fair Value					0
Branch held for sale | Level 2
Fair value measurements of assets on a nonrecurring basis
Basis	0		0
Fair Value					0
Branch held for sale | Level 3
Fair value measurements of assets on a nonrecurring basis
Basis	805		805
Fair Value	$ 805		$ 805		$ 1,330

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Fair value assets and liabilities measured on non recurring basis.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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