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Basis of Accounting and Consolidation - Schedule of Impact of ASU 2016-13 Adoption of PCD Assets Previously Classified as PCI (Details) - USD ($)	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans	$ 41,910,000		$ 26,911,000	$ 26,189,000	$ 19,977,000
Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			26,911,000
ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		$ 28,583,000
ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,672,000
Construction & Land Development | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			1,146,000
Construction & Land Development | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,033,000
Construction & Land Development | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		(113,000)
1-4 Family Residential Properties | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			1,386,000
1-4 Family Residential Properties | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		2,142,000
1-4 Family Residential Properties | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		756,000
Commercial Real Estate | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			11,198,000
Commercial Real Estate | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		11,739,000
Commercial Real Estate | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		541,000
Commercial & Industrial | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			9,273,000
Commercial & Industrial | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		9,428,000
Commercial & Industrial | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		155,000
Financial Asset Acquired with Credit Deterioration
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			365,000
Financial Asset Acquired with Credit Deterioration | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			26,911,000
Financial Asset Acquired with Credit Deterioration | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		28,583,000
Financial Asset Acquired with Credit Deterioration | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,672,000
Financial Asset Acquired with Credit Deterioration | Construction & Land Development | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			1,146,000
Financial Asset Acquired with Credit Deterioration | Construction & Land Development | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,033,000
Financial Asset Acquired with Credit Deterioration | Construction & Land Development | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		(113,000)
Financial Asset Acquired with Credit Deterioration | 1-4 Family Residential Properties | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			1,386,000
Financial Asset Acquired with Credit Deterioration | 1-4 Family Residential Properties | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		2,142,000
Financial Asset Acquired with Credit Deterioration | 1-4 Family Residential Properties | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		756,000
Financial Asset Acquired with Credit Deterioration | Commercial Real Estate | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			11,198,000
Financial Asset Acquired with Credit Deterioration | Commercial Real Estate | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		11,739,000
Financial Asset Acquired with Credit Deterioration | Commercial Real Estate | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		541,000
Financial Asset Acquired with Credit Deterioration | Commercial & Industrial | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			$ 9,273,000
Financial Asset Acquired with Credit Deterioration | Commercial & Industrial | ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		9,428,000
Financial Asset Acquired with Credit Deterioration | Commercial & Industrial | ASU 2016-13 | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		$ 155,000

X

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 310
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 326
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