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LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021 USD ($) contract TDR	Mar. 31, 2020 USD ($) contract	Jun. 30, 2020 TDR	Dec. 31, 2020 USD ($) TDR
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused commitments	$ 209,511			$ 247,324
Impaired financing receivable, recorded investment	40,243	$ 55,951		43,397
Recorded Investment	$ 17,442			$ 18,477
Number of delinquent TDR | TDR	1			1
Recorded investment in delinquent TDR	$ 17			$ 20
Number of Contracts	6	6	0
Outstanding balance	$ 42			15
TDR Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	17,442			18,477
Substandard non-TDR loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	6,326			8,061
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	16,475			16,859
Originated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 17,442	$ 12,088
Number of Contracts | contract	105	92
Originated Loans | Performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 11,752			11,752
Commercial/agriculture real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable, recorded investment	$ 24,948	$ 36,470		$ 26,303
Number of Contracts | contract	2	3
Commercial/agriculture real estate | Originated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recorded Investment	$ 8,656	$ 6,415
Number of Contracts | contract	30	28
Commercial/agriculture real estate | Agricultural real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan-to-value ratio (as a percent)	75.00%

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