LOANS - Impaired Loans (Details) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) loan property	Dec. 31, 2017 USD ($) loan property	Dec. 31, 2016 USD ($) loan
Impaired loans
Post-Modification Outstanding Recorded Investment	$ 9,219	$ 14,781	$ 1,305
Recorded Investment
With no related allowance recorded	16,634	20,784	3,287
With an allowance recorded	2,721	1,708	66
Total impaired loans	19,355	22,492	3,353
Unpaid Principal Balance
With no related allowance recorded	16,644	21,683	3,558
With an allowance recorded	2,721	3,235	66
Total impaired loans	19,365	24,918	3,624
Related Allocated Allowance
With an allowance recorded	189	1,708	1
Total impaired loans	189	1,708	1
Average Recorded Investment
With no related allowance recorded	12,531	10,407	1,895
With an allowance recorded	2,757	142	43
Average recorded investment in impaired loans	15,288	10,549	1,938
Interest Income Recognized
With no related allowance recorded	568	727	116
With an allowance recorded	91	174	7
Total impaired loans	659	$ 901	$ 123
Other real estate	$ 175
Other real estate owned, number of properties \| property	1	0
Number of loans modified as TDRs for which there was a payment default within twelve months following the modification \| loan	1	2	1
Commercial Real Estate \| Mortgage loans \| Owner occupied
Impaired loans
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Recorded Investment
With no related allowance recorded	268	2,073	326
With an allowance recorded	0	0	0
Total impaired loans	268	2,073	326
Unpaid Principal Balance
With no related allowance recorded	278	2,073	538
With an allowance recorded	0	0	0
Total impaired loans	278	2,073	538
Related Allocated Allowance
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Average Recorded Investment
With no related allowance recorded	177	173	176
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	177	173	176
Interest Income Recognized
With no related allowance recorded	0	80	10
With an allowance recorded	0	0	0
Total impaired loans	0	80	10
Commercial Real Estate \| Mortgage loans \| Non-owner occupied
Impaired loans
Post-Modification Outstanding Recorded Investment	926	7,764	0
Recorded Investment
With no related allowance recorded	2,816	9,089	1,213
With an allowance recorded	0	0	0
Total impaired loans	2,816	9,089	1,213
Unpaid Principal Balance
With no related allowance recorded	2,816	9,089	1,213
With an allowance recorded	0	0	0
Total impaired loans	2,816	9,089	1,213
Related Allocated Allowance
With an allowance recorded	0	0
Total impaired loans	0	0
Average Recorded Investment
With no related allowance recorded	1,583	7,001	614
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	1,583	7,001	614
Interest Income Recognized
With no related allowance recorded	88	400	75
With an allowance recorded	0	0	0
Total impaired loans	88	400	75
Residential real estate mortgage loans \| Mortgage loans \| Residential mortgage
Impaired loans
Post-Modification Outstanding Recorded Investment	644	0	252
Recorded Investment
With no related allowance recorded	0	0	520
With an allowance recorded	0	0	0
Total impaired loans	0	0	520
Unpaid Principal Balance
With no related allowance recorded	0	0	558
With an allowance recorded	0	0	0
Total impaired loans	0	0	558
Related Allocated Allowance
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Average Recorded Investment
With no related allowance recorded	0	0	276
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	0	0	276
Interest Income Recognized
With no related allowance recorded	0	0	0
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Residential real estate mortgage loans \| Mortgage loans \| Home equity
Impaired loans
Post-Modification Outstanding Recorded Investment	0	0	69
Recorded Investment
With no related allowance recorded	0	100	264
With an allowance recorded	0	0	0
Total impaired loans	0	100	264
Unpaid Principal Balance
With no related allowance recorded	0	100	285
With an allowance recorded	0	0	0
Total impaired loans	0	100	285
Related Allocated Allowance
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Average Recorded Investment
With no related allowance recorded	0	8	328
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	0	8	328
Interest Income Recognized
With no related allowance recorded	0	0	0
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Commercial, industrial and agricultural loans \| Secured
Impaired loans
Post-Modification Outstanding Recorded Investment	1,994	6,828	459
Recorded Investment
With no related allowance recorded	8,234	7,368	556
With an allowance recorded	2,721	0	0
Total impaired loans	10,955	7,368	556
Unpaid Principal Balance
With no related allowance recorded	8,234	8,013	556
With an allowance recorded	2,721	0	0
Total impaired loans	10,955	8,013	556
Related Allocated Allowance
With an allowance recorded	189	0	0
Total impaired loans	189	0	0
Average Recorded Investment
With no related allowance recorded	5,644	2,633	274
With an allowance recorded	2,757	0	0
Average recorded investment in impaired loans	8,401	2,633	274
Interest Income Recognized
With no related allowance recorded	196	211	12
With an allowance recorded	91	0	0
Total impaired loans	287	211	12
Commercial, industrial and agricultural loans \| Unsecured
Impaired loans
Post-Modification Outstanding Recorded Investment	5,655	189	525
Recorded Investment
With no related allowance recorded	5,316	2,154	408
With an allowance recorded	0	1,708	66
Total impaired loans	5,316	3,862	474
Unpaid Principal Balance
With no related allowance recorded	5,316	2,408	408
With an allowance recorded	0	3,235	66
Total impaired loans	5,316	5,643	474
Related Allocated Allowance
With an allowance recorded		1,708	1
Total impaired loans		1,708	1
Average Recorded Investment
With no related allowance recorded	5,127	592	227
With an allowance recorded	0	142	43
Average recorded investment in impaired loans	5,127	734	270
Interest Income Recognized
With no related allowance recorded	284	36	19
With an allowance recorded	0	174	7
Total impaired loans	284	210	$ 26
Taxi medallion loans
Impaired loans
Post-Modification Outstanding Recorded Investment	$ 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		1,700
Related Allocated Allowance
With an allowance recorded		$ 1,700
Non-recurring basis \| Carrying Amount
Interest Income Recognized
Other real estate	$ 175

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