LOANS - Impaired Loans (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019 USD ($) loan property	Mar. 31, 2018 USD ($) loan	Dec. 31, 2018 USD ($) loan property
Impaired loans
Loans modified as TDRs	$ 3,200
Recorded Investment
With no related allowance recorded	11,885		$ 16,634
With an allowance recorded	4,259		2,721
Total impaired loans	16,144		19,355
Unpaid Principal Balance
With no related allowance recorded	11,903		16,644
With an allowance recorded	4,259		2,721
Total impaired loans	16,162		19,365
Related Allocated Allowance
With an allowance recorded	299		189
Total impaired loans	299		189
Average Recorded Investment
With no related allowance recorded	10,368	$ 24,822
With an allowance recorded	3,942	1,708
Average recorded investment in impaired loans	14,310	26,530
Interest Income Recognized
With no related allowance recorded	126	169
With an allowance recorded	36	0
Total impaired loans	162	$ 169
Other real estate	$ 175		$ 175
Other real estate owned, number of properties \| property	1		1
Number of loans modified as TDRs for which there was a payment default within twelve months following the modification \| loan	1	0
Commercial Real Estate \| Mortgage loans \| Owner occupied
Recorded Investment
With no related allowance recorded	$ 595		$ 268
With an allowance recorded	0		0
Total impaired loans	595		268
Unpaid Principal Balance
With no related allowance recorded	608		278
With an allowance recorded	0		0
Total impaired loans	608		278
Related Allocated Allowance
With an allowance recorded	0		0
Total impaired loans	0		0
Average Recorded Investment
With no related allowance recorded	483	$ 2,073
With an allowance recorded	0	0
Average recorded investment in impaired loans	483	2,073
Interest Income Recognized
With no related allowance recorded	0	0
With an allowance recorded	0	0
Total impaired loans	0	0
Commercial Real Estate \| Mortgage loans \| Non-owner occupied
Recorded Investment
With no related allowance recorded	2,777		2,816
With an allowance recorded	0		0
Total impaired loans	2,777		2,816
Unpaid Principal Balance
With no related allowance recorded	2,781		2,816
With an allowance recorded	0		0
Total impaired loans	2,781		2,816
Related Allocated Allowance
With an allowance recorded	0		0
Total impaired loans	0		0
Average Recorded Investment
With no related allowance recorded	2,786	8,973
With an allowance recorded	0	0
Average recorded investment in impaired loans	2,786	8,973
Interest Income Recognized
With no related allowance recorded	25	76
With an allowance recorded	0	0
Total impaired loans	25	76
Residential real estate mortgage loans \| Mortgage loans \| Residential mortgage
Recorded Investment
With no related allowance recorded	0		0
With an allowance recorded	0		0
Total impaired loans	0		0
Unpaid Principal Balance
With no related allowance recorded	0		0
With an allowance recorded	0		0
Total impaired loans	0		0
Related Allocated Allowance
With an allowance recorded	0		0
Total impaired loans	0		0
Average Recorded Investment
With no related allowance recorded	0	0
With an allowance recorded	0	0
Average recorded investment in impaired loans	0	0
Interest Income Recognized
With no related allowance recorded	0	0
With an allowance recorded	0	0
Total impaired loans	0	0
Residential real estate mortgage loans \| Mortgage loans \| Home equity
Recorded Investment
With no related allowance recorded	0		0
With an allowance recorded	0		0
Total impaired loans	0		0
Unpaid Principal Balance
With no related allowance recorded	0		0
With an allowance recorded	0		0
Total impaired loans	0		0
Related Allocated Allowance
With an allowance recorded	0		0
Total impaired loans	0		0
Average Recorded Investment
With no related allowance recorded	0	100
With an allowance recorded	0	0
Average recorded investment in impaired loans	0	100
Interest Income Recognized
With no related allowance recorded	0	0
With an allowance recorded	0	0
Total impaired loans	0	0
Commercial, industrial and agricultural loans
Impaired loans
Loans modified as TDRs	3,200	6,700
Commercial, industrial and agricultural loans \| Secured
Recorded Investment
With no related allowance recorded	1,644		8,234
With an allowance recorded	4,259		2,721
Total impaired loans	5,903		10,955
Unpaid Principal Balance
With no related allowance recorded	1,644		8,234
With an allowance recorded	4,259		2,721
Total impaired loans	5,903		10,955
Related Allocated Allowance
With an allowance recorded	299		189
Total impaired loans	299		189
Average Recorded Investment
With no related allowance recorded	1,482	8,744
With an allowance recorded	3,942	0
Average recorded investment in impaired loans	5,424	8,744
Interest Income Recognized
With no related allowance recorded	16	56
With an allowance recorded	36	0
Total impaired loans	52	56
Commercial, industrial and agricultural loans \| Unsecured
Recorded Investment
With no related allowance recorded	6,869		5,316
With an allowance recorded	0		0
Total impaired loans	6,869		5,316
Unpaid Principal Balance
With no related allowance recorded	6,870		5,316
With an allowance recorded	0		0
Total impaired loans	6,870		5,316
Related Allocated Allowance
With an allowance recorded	0
Total impaired loans	0
Average Recorded Investment
With no related allowance recorded	5,617	4,932
With an allowance recorded	0	1,708
Average recorded investment in impaired loans	5,617	6,640
Interest Income Recognized
With no related allowance recorded	85	37
With an allowance recorded	0	0
Total impaired loans	85	$ 37
Taxi medallion loans
Impaired loans
Loans modified as TDRs			$ 2,700
Interest Income Recognized
Number of loans modified as TDRs for which there was a payment default within twelve months following the modification \| loan			3
Non-recurring basis
Recorded Investment
With an allowance recorded	4,300		$ 2,700
Related Allocated Allowance
With an allowance recorded	300		200
Non-recurring basis \| Carrying Amount
Interest Income Recognized
Other real estate	175		175
Non-recurring basis \| Carrying Amount \| Other real estate owned
Interest Income Recognized
Other real estate	$ 200		$ 200

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