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Basis of Accounting and Consolidation - Schedule of Impact of ASU 2016-13 Adoption (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
Allowance for credit losses on off-balance sheet exposures			0
Construction & Land Development | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			1,146,000
Farm | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			1,093,000
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
Commercial Real Estate | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			11,198,000
Agricultural | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			1,386,000
Commercial & Industrial | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			9,273,000
Consumer | Pre-ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans			$ 1,429,000
ASU 2016-13
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		$ 28,583,000
Allowance for credit losses on off-balance sheet exposures		69,000
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
Allowance for credit losses on off-balance sheet exposures		69,000
ASU 2016-13 | Construction & Land Development
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,033,000
ASU 2016-13 | Construction & Land Development | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		(113,000)
ASU 2016-13 | Farm
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,323,000
ASU 2016-13 | Farm | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		230,000
ASU 2016-13 | 1-4 Family Residential Properties
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		2,142,000
ASU 2016-13 | 1-4 Family Residential Properties | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		756,000
ASU 2016-13 | Commercial Real Estate
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		11,739,000
ASU 2016-13 | Commercial Real Estate | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		541,000
ASU 2016-13 | Agricultural
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,023,000
ASU 2016-13 | Agricultural | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		(363,000)
ASU 2016-13 | Commercial & Industrial
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		9,428,000
ASU 2016-13 | Commercial & Industrial | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		155,000
ASU 2016-13 | Consumer
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		1,895,000
ASU 2016-13 | Consumer | Impact of ASU
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Allowance for credit losses on loans		$ 466,000

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

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-Name Accounting Standards Codification
-Topic 310
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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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