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LOANS - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	$ 12,751	$ 15,281	$ 12,371	$ 14,225
Interest Income Recognized	74	45	146	94
Business Activities Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	8,746	8,854	8,440	7,805
Interest Income Recognized	52	31	85	52
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	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	1	1	2	1
Interest income recognized, with related allowance	0	0	0	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	5,528	6,639	5,466	6,204
Interest income recognized, with no related allowance	52	31	56	46
Average recorded investment, with related allowance	3,217	2,214	2,972	1,600
Interest income recognized, with related allowance	0	0	29	6
Business Activities Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,401	1,413	1,289	1,344
Interest Income Recognized	4	2	7	7
Business Activities Loans | Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	747	625	792	628
Interest income recognized, with no related allowance	4	2	7	7
Average recorded investment, with related allowance	654	788	497	716
Interest income recognized, with related allowance	0	0	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	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	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	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	0	0
Business Activities Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	2,592	4,843	2,629	4,827
Interest Income Recognized	18	12	54	35
Business Activities Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	2,041	3,955	2,089	4,027
Interest income recognized, with no related allowance	16	9	47	28
Average recorded investment, with related allowance	551	888	540	800
Interest income recognized, with related allowance	2	3	7	7
Business Activities Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	12	171	13	249
Interest Income Recognized	0	0	0	0
Business Activities Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	158	0	236
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	12	13	13	13
Interest income recognized, with related allowance	0	0	0	0
Business Activities Loans | Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	0	0
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,702	1,021	1,595	852
Interest Income Recognized	0	0	0	2
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	253	95	212	97
Interest Income Recognized	0	0	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	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	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	88	95	89	97
Interest income recognized, with no related allowance	0	0	0	1
Average recorded investment, with related allowance	165	0	123	0
Interest income recognized, with related allowance	0	0	0	0
Acquired Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	395	469	429	445
Interest Income Recognized	0	0	0	1
Acquired Loans | Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	395	469	429	445
Interest income recognized, with no related allowance	0	0	0	1
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	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	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	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	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	0	0
Acquired Loans | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,054	457	954	310
Interest Income Recognized	0	0	0	0
Acquired Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	702	276	593	124
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	352	181	361	186
Interest income recognized, with related allowance	0	0	0	0
Acquired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Acquired Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	0	0	0	0
Acquired Loans | Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	0	0	0
Interest income recognized, with no related allowance	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0
Interest income recognized, with related allowance	$ 0	$ 0	$ 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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