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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 ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans	$ 55,418,000	$ 41,910,000	$ 32,876,000		$ 26,911,000
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 | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans					365,000
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				1,198,000
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				833,000
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					0
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				291,000
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				291,000
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					6,000
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				48,000
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				42,000
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					359,000
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				818,000
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				459,000
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					$ 0
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				41,000
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				$ 41,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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-Topic 326
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