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LOANS - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	$ 4,740	$ 6,394
Cash Basis Interest Income Recognized	110	198
Business Activities Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	3,046	4,192
Cash Basis Interest Income Recognized	64	131
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	637	928
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	1,716	2,713
Cash basis interest income recognized, with no related allowance	64	131
Recorded investment, with related allowance	693	551
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	151	493
Cash Basis Interest Income Recognized	8	10
Business Activities Loans | Commercial and industrial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	99	141
Cash basis interest income recognized, with no related allowance	6	2
Recorded investment, with related allowance	44	221
Cash basis interest income recognized, with related allowance	1	0
Business Activities Loans | Commercial and industrial | Agricultural and other loans to farmers
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	8	131
Cash basis interest income recognized, with no related allowance	1	8
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	1,513	1,675
Cash Basis Interest Income Recognized	36	55
Business Activities Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	1,245	1,344
Cash basis interest income recognized, with no related allowance	31	55
Recorded investment, with related allowance	268	331
Cash basis interest income recognized, with related allowance	5	0
Business Activities Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	30	34
Cash Basis Interest Income Recognized	2	2
Business Activities Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	13	17
Cash basis interest income recognized, with no related allowance	0	1
Recorded investment, with related allowance	12	0
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	5	0
Cash basis interest income recognized, with no related allowance	2	1
Recorded investment, with related allowance	0	17
Cash basis interest income recognized, with related allowance	0	0
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	616	0
Cash Basis Interest Income Recognized	1	0
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	135	0
Cash Basis Interest Income Recognized	0	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	89	0
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	46	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	171	0
Cash Basis Interest Income Recognized	0	0
Acquired Loans | Commercial and industrial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	171	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 | Agricultural and other loans to farmers
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	254	0
Cash Basis Interest Income Recognized	1	0
Acquired Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	254	0
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 | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	56	0
Cash Basis 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	47	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	9	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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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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