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LOANS - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	$ 12,937	$ 14,519	$ 12,727	$ 13,811
Interest Income Recognized	41	23	85	44
Business Activities Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	8,896	7,847	8,719	7,437
Interest Income Recognized	20	9	46	15
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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	1	0	3	0
Cash basis 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	7,499	6,519	7,219	6,364
Cash basis interest income recognized, with no related allowance	20	9	46	15
Recorded investment, with related allowance	1,396	1,328	1,497	1,073
Cash basis interest income recognized, with related allowance	0	0	0	0
Business Activities Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,352	1,514	1,348	1,327
Interest Income Recognized	2	3	3	5
Business Activities Loans | Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	940	731	931	680
Cash basis interest income recognized, with no related allowance	2	3	3	5
Recorded investment, with related allowance	412	783	417	647
Cash basis 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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis 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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis 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	2,676	4,855	2,647	4,759
Interest Income Recognized	19	11	36	24
Business Activities Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	2,104	4,057	2,113	4,063
Cash basis interest income recognized, with no related allowance	16	9	31	19
Recorded investment, with related allowance	572	798	534	696
Cash basis interest income recognized, with related allowance	3	2	5	5
Business Activities Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	13	303	13	288
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	303	0	288
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	13	0	13	0
Cash basis 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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis interest income recognized, with related allowance	0	0	0	0
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,459	755	1,435	709
Interest Income Recognized	0	1	0	2
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	258	230	193	230
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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis 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	187	230	157	230
Cash basis interest income recognized, with no related allowance	0	0	0	1
Recorded investment, with related allowance	71	0	36	0
Cash basis 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	412	432	446	432
Interest Income Recognized	0	1	0	1
Acquired Loans | Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	412	49	446	49
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	383	0	383
Cash basis interest income recognized, with related allowance	0	1	0	1
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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis 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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis 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	789	93	796	47
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	426	93	431	47
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	363	0	365	0
Cash basis 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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis 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
Cash basis interest income recognized, with no related allowance	0	0	0	0
Recorded investment, with related allowance	0	0	0	0
Cash basis interest income recognized, with related allowance	$ 0	$ 0	$ 0	$ 0

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