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LOANS - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	$ 14,225	$ 4,740
Interest Income Recognized	94	110
Business Activities Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	7,805	3,046
Interest Income Recognized	52	64
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	1	637
Cash basis interest income recognized, with related allowance	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	6,204	1,716
Cash basis interest income recognized, with no related allowance	46	64
Recorded investment, with related allowance	1,600	693
Cash basis interest income recognized, with related allowance	6	0
Business Activities Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	1,344	151
Interest Income Recognized	7	8
Business Activities Loans | Commercial and industrial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	628	99
Cash basis interest income recognized, with no related allowance	7	6
Recorded investment, with related allowance	716	44
Cash basis interest income recognized, with related allowance	0	1
Business Activities Loans | Commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	8
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
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	4,827	1,513
Interest Income Recognized	35	36
Business Activities Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	4,027	1,245
Cash basis interest income recognized, with no related allowance	28	31
Recorded investment, with related allowance	800	268
Cash basis interest income recognized, with related allowance	7	5
Business Activities Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	249	30
Interest Income Recognized	0	2
Business Activities Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	236	13
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	13	12
Cash basis interest income recognized, with related allowance	0	0
Business Activities Loans | Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	0	5
Cash basis interest income recognized, with no related allowance	0	2
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	852	616
Interest Income Recognized	2	1
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	97	135
Interest Income Recognized	1	0
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	97	89
Cash basis interest income recognized, with no related allowance	1	0
Recorded investment, with related allowance	0	46
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	445	171
Interest Income Recognized	1	0
Acquired Loans | Commercial and industrial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	445	171
Cash basis interest income recognized, with no related allowance	1	0
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	310	254
Interest Income Recognized	0	1
Acquired Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	124	254
Cash basis interest income recognized, with no related allowance	0	1
Recorded investment, with related allowance	186	0
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	0	56
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	47
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	9
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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