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Loans and Allowance for Credit Losses - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	$ 34,199	$ 31,294
Interest Income Recognized	63	71
Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	27,018	22,388
Interest Income Recognized	56	69
Construction and Land Development | Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	754	600
Interest Income Recognized	5	8
Agricultural | Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	957	1,202
Interest Income Recognized	0	0
Residential Properties | Real Estate Loan | 1-4 Family
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	9,857	8,997
Interest Income Recognized	13	18
Residential Properties | Real Estate Loan | Multifamily
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	2,294	3,323
Interest Income Recognized	0	1
Commercial | Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	13,156	8,266
Interest Income Recognized	38	42
Agricultural Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	262	960
Interest Income Recognized	6	0
Commercial and Industrial Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	6,455	7,402
Interest Income Recognized	1	2
Consumer Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	438	544
Interest Income Recognized	0	0
All Other Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	26	0
Interest Income Recognized	$ 0	$ 0

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

+ Details

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Period Type:	duration

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- References

No definition available.

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- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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