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LOANS - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	$ 10,893	$ 11,920
Interest Income Recognized	115	135
Business Activities Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	7,227	8,019
Interest Income Recognized	56	77
Business Activities Loans | Commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	56	1
Cash basis interest income recognized, with related allowance	1	0
Business Activities Loans | Commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	5,434	6,878
Cash basis interest income recognized, with no related allowance	55	77
Recorded investment, with related allowance	1,737	1,140
Cash basis interest income recognized, with related allowance	0	0
Business Activities Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,024	1,369
Interest Income Recognized	5	9
Business Activities Loans | Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	871	634
Cash basis interest income recognized, with no related allowance	5	9
Recorded investment, with related allowance	153	735
Cash basis interest income recognized, with related allowance	0	0
Business Activities Loans | Commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Business Activities Loans | Commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Business Activities Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	2,629	2,519
Interest Income Recognized	54	48
Business Activities Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	2,089	1,693
Cash basis interest income recognized, with no related allowance	47	39
Recorded investment, with related allowance	540	826
Cash basis interest income recognized, with related allowance	7	9
Business Activities Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	13	13
Interest Income Recognized	0	1
Business Activities Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	13	13
Cash basis interest income recognized, with related allowance	0	1
Business Activities Loans | Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,654	1,213
Interest Income Recognized	0	5
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	212	112
Interest Income Recognized	0	1
Acquired Loans | Commercial real estate | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans | Commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	89	112
Cash basis interest income recognized, with no related allowance	0	1
Recorded investment, with related allowance	123	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	429	441
Interest Income Recognized	0	1
Acquired Loans | Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	429	441
Cash basis interest income recognized, with no related allowance	0	1
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans | Commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans | Commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,013	660
Interest Income Recognized	0	3
Acquired Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	652	442
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	361	218
Cash basis interest income recognized, with related allowance	0	3
Acquired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Acquired Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans | Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	0	0
Cash basis interest income recognized, with related allowance	$ 0	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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