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LOANS - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	$ 13,028	$ 14,028
Interest Income Recognized	45	135
Business Activities Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	8,981	7,670
Interest Income Recognized	26	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	589
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	5	0
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	7,773	5,937
Cash basis interest income recognized, with no related allowance	26	77
Recorded investment, with related allowance	1,203	1,144
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	1,417	1,521
Interest Income Recognized	2	9
Business Activities Loans | Commercial and industrial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	527	1,334
Cash basis interest income recognized, with no related allowance	2	9
Recorded investment, with related allowance	890	187
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	2,617	4,393
Interest Income Recognized	17	48
Business Activities Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	1,965	3,591
Cash basis interest income recognized, with no related allowance	15	39
Recorded investment, with related allowance	652	802
Cash basis interest income recognized, with related allowance	2	9
Business Activities Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	13	444
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	444
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	13	0
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	1,408	1,236
Interest Income Recognized	0	1
Acquired Loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Recorded Investment	126	133
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	90	133
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	36	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	479	595
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	479	161
Cash basis interest income recognized, with no related allowance	0	1
Recorded investment, with related allowance	0	434
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	803	508
Interest Income Recognized	0	0
Acquired Loans | Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average recorded investment, with no related allowance	436	508
Cash basis interest income recognized, with no related allowance	0	0
Recorded investment, with related allowance	367	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	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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