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LOANS - Recorded Investment and Number of Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) modification	Dec. 31, 2017 USD ($) modification	Dec. 31, 2016 USD ($) modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	41	18	13
Pre-Modification Outstanding Recorded Investment	$ 6,081	$ 1,713	$ 1,537
Post-Modification Outstanding Recorded Investment	4,914	1,504	1,457
Individually evaluated for impairment	354	$ 0	$ 9
Loan relationships having aggregate balances in excess of threshold with potential credit weakness	$ 150
Commercial real estate: | Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	1	0	0
Pre-Modification Outstanding Recorded Investment	$ 1	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	1	0	0
Individually evaluated for impairment	$ 1	$ 0	$ 0
Commercial real estate: | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	9	6	6
Pre-Modification Outstanding Recorded Investment	$ 1,896	$ 388	$ 1,459
Post-Modification Outstanding Recorded Investment	1,564	222	1,354
Individually evaluated for impairment	$ 153	$ 0	$ 0
Commercial and industrial | Other Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	7	6	2
Pre-Modification Outstanding Recorded Investment	$ 556	$ 563	$ 38
Post-Modification Outstanding Recorded Investment	486	545	48
Individually evaluated for impairment	$ 55	$ 0	$ 0
Commercial and industrial | Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	1	1	3
Pre-Modification Outstanding Recorded Investment	$ 167	$ 19	$ 29
Post-Modification Outstanding Recorded Investment	0	18	44
Individually evaluated for impairment	$ 0	$ 0	$ 0
Commercial and industrial | Tax exempt
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0	0
Individually evaluated for impairment	$ 0	$ 0	$ 0
Residential real estate | Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	19	3	0
Pre-Modification Outstanding Recorded Investment	$ 3,348	$ 692	$ 0
Post-Modification Outstanding Recorded Investment	2,752	670	0
Individually evaluated for impairment	$ 145	$ 0	$ 0
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	1	1	0
Pre-Modification Outstanding Recorded Investment	$ 100	$ 13	$ 0
Post-Modification Outstanding Recorded Investment	100	13	0
Individually evaluated for impairment	$ 0	$ 0	$ 0
Consumer | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	3	1	2
Pre-Modification Outstanding Recorded Investment	$ 13	$ 38	$ 11
Post-Modification Outstanding Recorded Investment	11	36	11
Individually evaluated for impairment	$ 0	$ 0	$ 9
Interest Rate And Maturity Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	1	6	6
Post-Modification Outstanding Recorded Investment	$ 16	$ 725	$ 440
Amortization And Maturity Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	1	6	0
Post-Modification Outstanding Recorded Investment	$ 286	$ 490	$ 0
Amortization Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	1	4
Post-Modification Outstanding Recorded Investment	$ 0	$ 94	$ 981
Amortization, Interest Rate And Maturity Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	1	0
Post-Modification Outstanding Recorded Investment	$ 0	$ 36	$ 0
Amortization And Interest Rate Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	0	1
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 9
Forbearance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	3	0	0
Post-Modification Outstanding Recorded Investment	$ 271	$ 0	$ 0
Forbearance And Interest Only Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	6	0	0
Post-Modification Outstanding Recorded Investment	$ 121	$ 0	$ 0
Forbearance and Interest Rate Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	1	0	0
Post-Modification Outstanding Recorded Investment	$ 49	$ 0	$ 0
Forbearance and Maturity Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	20	0	0
Post-Modification Outstanding Recorded Investment	$ 2,030	$ 0	$ 0
Extended Maturity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	2	0	0
Post-Modification Outstanding Recorded Investment	$ 440	$ 0	$ 0
Restructure Without Concession
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	5	0	0
Post-Modification Outstanding Recorded Investment	$ 1,419	$ 0	$ 0
Court Ordered
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	0	0	1
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 1
Other Concessions
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Modifications (in modification) | modification	2	4	1
Post-Modification Outstanding Recorded Investment	$ 282	$ 159	$ 26

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