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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Loans Receivable by Loan Type (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Loans receivable
Total Loans	$ 1,201,262	$ 1,246,889	$ 1,189,425
Performing loans
Loans receivable
TDR loans	11,752	11,722
Loans other	1,180,295	1,223,834
Total Loans	1,192,047	1,235,556
Nonperforming loans
Loans receivable
TDR loans	5,690	6,755
Loans other	3,525	4,578
Total Loans	9,215	11,333
Commercial/agriculture real estate
Loans receivable
Total Loans	795,476	797,139	802,469
Commercial/agriculture real estate | Performing loans
Loans receivable
TDR loans	4,472	4,695
Loans other	785,733	786,533
Total Loans	790,205	791,228
Commercial/agriculture real estate | Nonperforming loans
Loans receivable
TDR loans	4,184	4,691
Loans other	1,087	1,220
Total Loans	5,271	5,911
C&I/Agricultural operating
Loans receivable
Total Loans	243,114	273,040	159,946
C&I/Agricultural operating | Performing loans
Loans receivable
TDR loans	4,042	3,836
Loans other	237,917	266,975
Total Loans	241,959	270,811
C&I/Agricultural operating | Nonperforming loans
Loans receivable
TDR loans	758	1,287
Loans other	397	942
Total Loans	1,155	2,229
Residential mortgage
Loans receivable
Total Loans	127,622	137,646	173,412
Residential mortgage | Performing loans
Loans receivable
TDR loans	3,195	3,142
Loans other	121,746	131,470
Total Loans	124,941	134,612
Residential mortgage | Nonperforming loans
Loans receivable
TDR loans	742	777
Loans other	1,939	2,257
Total Loans	2,681	3,034
Consumer installment
Loans receivable
Total Loans	35,050	39,064	$ 53,598
Consumer installment | Performing loans
Loans receivable
TDR loans	43	49
Loans other	34,899	38,856
Total Loans	34,942	38,905
Consumer installment | Nonperforming loans
Loans receivable
TDR loans	6	0
Loans other	102	159
Total Loans	$ 108	$ 159

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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