LOANS - Impaired Loans (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan property	Dec. 31, 2017 USD ($) loan
Impaired loans
Loans modified as TDRs	$ 21,748	$ 9,219	$ 14,781
Recorded Investment
With no related allowance recorded	15,326	16,634	20,784
With an allowance recorded	11,657	2,721	1,708
Total impaired loans	26,983	19,355	22,492
Unpaid Principal Balance
With no related allowance recorded	15,354	16,644	21,683
With an allowance recorded	11,663	2,721	3,235
Total impaired loans	27,017	19,365	24,918
Related Allocated Allowance
With an allowance recorded	4,676	189	1,708
Total impaired loans	4,676	189	1,708
Average Recorded Investment
With no related allowance recorded	10,397	12,531	10,407
With an allowance recorded	8,027	2,757	142
Average recorded investment in impaired loans	18,424	15,288	10,549
Interest Income Recognized
With no related allowance recorded	569	568	727
With an allowance recorded	309	91	174
Total impaired loans	$ 878	659	$ 901
Other real estate		$ 175
Other real estate owned, number of properties \| property		1
Number of loans modified as TDRs for which there was a payment default within twelve months following the modification \| loan	2	1	2
Commercial Real Estate \| Mortgage loans \| Owner occupied
Impaired loans
Loans modified as TDRs	$ 8,582	$ 0	$ 0
Recorded Investment
With no related allowance recorded	3,379	268	2,073
With an allowance recorded	0	0	0
Total impaired loans	3,379	268	2,073
Unpaid Principal Balance
With no related allowance recorded	3,401	278	2,073
With an allowance recorded	0	0	0
Total impaired loans	3,401	278	2,073
Related Allocated Allowance
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Average Recorded Investment
With no related allowance recorded	1,286	177	173
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	1,286	177	173
Interest Income Recognized
With no related allowance recorded	41	0	80
With an allowance recorded	0	0	0
Total impaired loans	41	0	80
Commercial Real Estate \| Mortgage loans \| Non-owner occupied
Impaired loans
Loans modified as TDRs	0	926	7,764
Recorded Investment
With no related allowance recorded	2,296	2,816	9,089
With an allowance recorded	0	0	0
Total impaired loans	2,296	2,816	9,089
Unpaid Principal Balance
With no related allowance recorded	2,296	2,816	9,089
With an allowance recorded	0	0	0
Total impaired loans	2,296	2,816	9,089
Related Allocated Allowance
With an allowance recorded	0	0
Total impaired loans	0	0
Average Recorded Investment
With no related allowance recorded	2,149	1,583	7,001
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	2,149	1,583	7,001
Interest Income Recognized
With no related allowance recorded	99	88	400
With an allowance recorded	0	0	0
Total impaired loans	99	88	400
Residential real estate mortgage loans \| Mortgage loans \| Residential mortgage
Impaired loans
Loans modified as TDRs	338	644	0
Recorded Investment
With no related allowance recorded	0	0	0
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Unpaid Principal Balance
With no related allowance recorded	0	0	0
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
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	0
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	0	0	0
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
Loans modified as TDRs	0	0	0
Recorded Investment
With no related allowance recorded	294	0	100
With an allowance recorded	0	0	0
Total impaired loans	294	0	100
Unpaid Principal Balance
With no related allowance recorded	300	0	100
With an allowance recorded	0	0	0
Total impaired loans	300	0	100
Related Allocated Allowance
With an allowance recorded	0	0	0
Total impaired loans	0	0	0
Average Recorded Investment
With no related allowance recorded	74	0	8
With an allowance recorded	0	0	0
Average recorded investment in impaired loans	74	0	8
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
Loans modified as TDRs	6,920	1,994	6,828
Recorded Investment
With no related allowance recorded	494	8,234	7,368
With an allowance recorded	9,612	2,721	0
Total impaired loans	10,106	10,955	7,368
Unpaid Principal Balance
With no related allowance recorded	494	8,234	8,013
With an allowance recorded	9,612	2,721	0
Total impaired loans	10,106	10,955	8,013
Related Allocated Allowance
With an allowance recorded	3,435	189	0
Total impaired loans	3,435	189	0
Average Recorded Investment
With no related allowance recorded	287	5,644	2,633
With an allowance recorded	6,189	2,757	0
Average recorded investment in impaired loans	6,476	8,401	2,633
Interest Income Recognized
With no related allowance recorded	18	196	211
With an allowance recorded	223	91	0
Total impaired loans	241	287	211
Commercial, industrial and agricultural loans \| Unsecured
Impaired loans
Loans modified as TDRs	5,908	5,655	189
Recorded Investment
With no related allowance recorded	8,863	5,316	2,154
With an allowance recorded	2,045	0	1,708
Total impaired loans	10,908	5,316	3,862
Unpaid Principal Balance
With no related allowance recorded	8,863	5,316	2,408
With an allowance recorded	2,051	0	3,235
Total impaired loans	10,914	5,316	5,643
Related Allocated Allowance
With an allowance recorded	1,241		1,708
Total impaired loans	1,241		1,708
Average Recorded Investment
With no related allowance recorded	6,601	5,127	592
With an allowance recorded	1,838	0	142
Average recorded investment in impaired loans	8,439	5,127	734
Interest Income Recognized
With no related allowance recorded	411	284	36
With an allowance recorded	86	0	174
Total impaired loans	497	284	$ 210
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
Other Impaired Performing Loans
Impaired loans
Loans modified as TDRs	$ 1,100
Non-recurring basis
Recorded Investment
With an allowance recorded		$ 2,700
Related Allocated Allowance
With an allowance recorded		200
Non-recurring basis \| Carrying Amount
Interest Income Recognized
Other real estate		$ 175

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