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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Accounts, Notes, Loans and Financing Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loans receivable
Total Past Due Accruing and Nonaccrual Loans	$ 1,416,135	$ 1,317,045
Performing loans
Loans receivable
TDR loans	5,171	7,984
Other loans	1,399,514	1,297,236
Total Past Due Accruing and Nonaccrual Loans	1,404,685	1,305,220
Nonperforming loans
Loans receivable
TDR loans	2,617	4,539
Other loans	8,833	7,286
Total Past Due Accruing and Nonaccrual Loans	11,450	11,825
Commercial/Agricultural real estate:
Loans receivable
Total Past Due Accruing and Nonaccrual Loans	1,125,279	1,034,829
Commercial/Agricultural real estate: | Performing loans
Loans receivable
TDR loans	1,336	4,618
Other loans	1,115,465	1,021,346
Total Past Due Accruing and Nonaccrual Loans	1,116,801	1,025,964
Commercial/Agricultural real estate: | Nonperforming loans
Loans receivable
TDR loans	1,878	3,389
Other loans	6,600	5,476
Total Past Due Accruing and Nonaccrual Loans	8,478	8,865
C&I/Agricultural operating:
Loans receivable
Total Past Due Accruing and Nonaccrual Loans	164,819	162,510
C&I/Agricultural operating: | Performing loans
Loans receivable
TDR loans	960	649
Other loans	162,417	160,570
Total Past Due Accruing and Nonaccrual Loans	163,377	161,219
C&I/Agricultural operating: | Nonperforming loans
Loans receivable
TDR loans	391	554
Other loans	1,051	737
Total Past Due Accruing and Nonaccrual Loans	1,442	1,291
Residential mortgage:
Loans receivable
Total Past Due Accruing and Nonaccrual Loans	108,651	94,861
Residential mortgage: | Performing loans
Loans receivable
TDR loans	2,875	2,681
Other loans	104,287	90,591
Total Past Due Accruing and Nonaccrual Loans	107,162	93,272
Residential mortgage: | Nonperforming loans
Loans receivable
TDR loans	348	593
Other loans	1,141	996
Total Past Due Accruing and Nonaccrual Loans	1,489	1,589
Consumer installment:
Loans receivable
Total Past Due Accruing and Nonaccrual Loans	17,386	24,845
Consumer installment: | Performing loans
Loans receivable
TDR loans	0	36
Other loans	17,345	24,729
Total Past Due Accruing and Nonaccrual Loans	17,345	24,765
Consumer installment: | Nonperforming loans
Loans receivable
TDR loans	0	3
Other loans	41	77
Total Past Due Accruing and Nonaccrual Loans	$ 41	$ 80

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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