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Loans and Allowance for Loan Losses - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	$ 27,520	$ 41,558	$ 28,708	$ 42,823
Interest Income Recognized	69	150	139	291
Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	20,994	30,064	21,254	31,210
Interest Income Recognized	68	148	136	288
Construction and Land Development | Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	590	629	595	632
Interest Income Recognized	8	8	15	16
Agricultural | Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	854	956	854	957
Interest Income Recognized	0	0	0	0
Residential Properties | Real Estate Loan | 1-4 Family
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	8,920	9,543	9,062	9,973
Interest Income Recognized	18	26	37	51
Residential Properties | Real Estate Loan | Multifamily
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	2,374	4,522	2,391	4,804
Interest Income Recognized	0	32	0	61
Commercial | Real Estate Loan
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	8,256	14,414	8,352	14,844
Interest Income Recognized	42	82	84	160
Agricultural Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	902	823	909	773
Interest Income Recognized	0	1	0	1
Commercial and Industrial Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	5,167	9,929	6,046	10,059
Interest Income Recognized	1	1	3	2
Consumer Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	457	742	499	781
Interest Income Recognized	0	0	0	0
All Other Loans
Average recorded investment and interest income recognized [Abstract]
Average Investment in Impaired Loans	0	0	0	0
Interest Income Recognized	$ 0	$ 0	$ 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=118936363&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=118936363&loc=d3e5258-111524

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- References

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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=118936363&loc=d3e5212-111524

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