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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	$ 1,420,955	$ 1,411,784
Nonaccrual Loans	10,410	11,204
Total Past Due Accruing and Nonaccrual Loans	12,950	22,861
Total Loans	1,420,955	1,416,135	$ 1,295,666
Financial Asset, Past Due
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	2,540	11,657
30-59 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	2,154	10,816
60-89 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	162	595
Greater Than 89 Days Past Due
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	224	246
Current
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	1,408,005	1,393,274
Commercial/Agricultural Real Estate
Aging analysis of the Bank's real estate and consumer loans
Total Loans		1,125,279	1,032,857
Commercial/Agricultural Real Estate | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	5,514	5,736
Total Past Due Accruing and Nonaccrual Loans	6,198	6,026
Total Loans	724,685	725,971
Commercial/Agricultural Real Estate | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	2,496	2,742
Total Past Due Accruing and Nonaccrual Loans	2,496	7,734
Total Loans	90,706	87,908
Commercial/Agricultural Real Estate | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	0	0
Total Past Due Accruing and Nonaccrual Loans	0	0
Total Loans	207,686	208,908
Commercial/Agricultural Real Estate | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	0	0
Total Past Due Accruing and Nonaccrual Loans	94	3,975
Total Loans	114,288	102,492
Commercial/Agricultural Real Estate | Financial Asset, Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	684	290
Commercial/Agricultural Real Estate | Financial Asset, Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	4,992
Commercial/Agricultural Real Estate | Financial Asset, Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | Financial Asset, Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	94	3,975
Commercial/Agricultural Real Estate | 30-59 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	684	202
Commercial/Agricultural Real Estate | 30-59 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	4,992
Commercial/Agricultural Real Estate | 30-59 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | 30-59 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	94	3,975
Commercial/Agricultural Real Estate | 60-89 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	88
Commercial/Agricultural Real Estate | 60-89 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | 60-89 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | 60-89 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | Greater Than 89 Days Past Due | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | Greater Than 89 Days Past Due | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | Greater Than 89 Days Past Due | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | Greater Than 89 Days Past Due | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Commercial/Agricultural Real Estate | Current | Commercial real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	718,487	719,945
Commercial/Agricultural Real Estate | Current | Agricultural real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	88,210	80,174
Commercial/Agricultural Real Estate | Current | Multi-family real estate
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	207,686	208,908
Commercial/Agricultural Real Estate | Current | Construction and land development
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	114,194	98,517
C&I/Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total Loans		164,819	151,850
C&I/Agricultural operating | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	452	552
Total Past Due Accruing and Nonaccrual Loans	452	578
Total Loans	130,417	136,013
C&I/Agricultural operating | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	794	890
Total Past Due Accruing and Nonaccrual Loans	809	1,716
Total Loans	24,168	28,806
C&I/Agricultural operating | Financial Asset, Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	26
C&I/Agricultural operating | Financial Asset, Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	15	826
C&I/Agricultural operating | 30-59 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
C&I/Agricultural operating | 30-59 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	15	826
C&I/Agricultural operating | 60-89 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	26
C&I/Agricultural operating | 60-89 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
C&I/Agricultural operating | Greater Than 89 Days Past Due | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
C&I/Agricultural operating | Greater Than 89 Days Past Due | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
C&I/Agricultural operating | Current | Commercial and industrial
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	129,965	135,435
C&I/Agricultural operating | Current | Agricultural operating
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	23,359	27,090
Residential Mortgage
Aging analysis of the Bank's real estate and consumer loans
Total Loans		108,651	88,260
Residential Mortgage | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	1,131	1,253
Total Past Due Accruing and Nonaccrual Loans	2,825	2,735
Total Loans	109,759	105,389
Residential Mortgage | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	0	0
Total Past Due Accruing and Nonaccrual Loans	0	0
Total Loans	3,206	3,262
Residential Mortgage | Financial Asset, Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	1,694	1,482
Residential Mortgage | Financial Asset, Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Residential Mortgage | 30-59 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	1,313	767
Residential Mortgage | 30-59 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Residential Mortgage | 60-89 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	160	479
Residential Mortgage | 60-89 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Residential Mortgage | Greater Than 89 Days Past Due | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	221	236
Residential Mortgage | Greater Than 89 Days Past Due | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Residential Mortgage | Current | Residential mortgage
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	106,934	102,654
Residential Mortgage | Current | Purchased HELOC loans
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	3,206	3,262
Consumer Installment
Aging analysis of the Bank's real estate and consumer loans
Total Loans		17,386	$ 22,699
Consumer Installment | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	21	27
Total Past Due Accruing and Nonaccrual Loans	45	42
Total Loans	9,313	10,236
Consumer Installment | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Nonaccrual Loans	2	4
Total Past Due Accruing and Nonaccrual Loans	31	55
Total Loans	6,727	7,150
Consumer Installment | Financial Asset, Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	24	15
Consumer Installment | Financial Asset, Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	29	51
Consumer Installment | 30-59 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	24	15
Consumer Installment | 30-59 Days Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	24	39
Consumer Installment | 60-89 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Consumer Installment | 60-89 Days Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	2	2
Consumer Installment | Greater Than 89 Days Past Due | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	0	0
Consumer Installment | Greater Than 89 Days Past Due | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	3	10
Consumer Installment | Current | Originated indirect paper
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	9,268	10,194
Consumer Installment | Current | Other consumer
Aging analysis of the Bank's real estate and consumer loans
Total allowance for credit losses on loans	$ 6,696	$ 7,095

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