LOANS - Impaired Loans (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) loan	Sep. 30, 2018 USD ($) loan	Dec. 31, 2018 USD ($) loan property
Impaired loans
Loans modified as TDRs			$ 20,300
Recorded Investment
With no related allowance recorded	$ 20,734		20,734		$ 16,634
With an allowance recorded	11,975		11,975		2,721
Total impaired loans	32,709		32,709		19,355
Unpaid Principal Balance
With no related allowance recorded	20,753		20,753		16,644
With an allowance recorded	11,975		11,975		2,721
Total impaired loans	32,728		32,728		19,365
Related Allocated Allowance
With an allowance recorded	4,689		4,689		189
Total impaired loans	4,689		4,689		189
Average Recorded Investment
With no related allowance recorded	13,519	$ 15,260	9,333	$ 14,731
With an allowance recorded	8,982	0	6,751	0
Average recorded investment in impaired loans	22,501	15,260	16,084	14,731
Interest Income Recognized
With no related allowance recorded	183	109	388	307
With an allowance recorded	87	0	199	0
Total impaired loans	270	109	587	$ 307
Other real estate	0		$ 0		$ 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			3	0
Commercial Real Estate
Impaired loans
Loans modified as TDRs	7,400	900	$ 7,400	$ 900
Commercial Real Estate \| Mortgage loans \| Owner occupied
Recorded Investment
With no related allowance recorded	8,828		8,828		$ 268
With an allowance recorded	0		0		0
Total impaired loans	8,828		8,828		268
Unpaid Principal Balance
With no related allowance recorded	8,847		8,847		278
With an allowance recorded	0		0		0
Total impaired loans	8,847		8,847		278
Related Allocated Allowance
With an allowance recorded	0		0		0
Total impaired loans	0		0		0
Average Recorded Investment
With no related allowance recorded	3,095	268	1,196	151
With an allowance recorded	0	0	0	0
Average recorded investment in impaired loans	3,095	268	1,196	151
Interest Income Recognized
With no related allowance recorded	28	0	28	0
With an allowance recorded	0	0	0	0
Total impaired loans	28	0	28	0
Commercial Real Estate \| Mortgage loans \| Non-owner occupied
Recorded Investment
With no related allowance recorded	2,332		2,332		2,816
With an allowance recorded	0		0		0
Total impaired loans	2,332		2,332		2,816
Unpaid Principal Balance
With no related allowance recorded	2,332		2,332		2,816
With an allowance recorded	0		0		0
Total impaired loans	2,332		2,332		2,816
Related Allocated Allowance
With an allowance recorded	0		0		0
Total impaired loans	0		0		0
Average Recorded Investment
With no related allowance recorded	2,344	1,763	2,096	1,366
With an allowance recorded	0	0	0	0
Average recorded investment in impaired loans	2,344	1,763	2,096	1,366
Interest Income Recognized
With no related allowance recorded	25	10	75	18
With an allowance recorded	0	0	0	0
Total impaired loans	25	10	75	18
Residential real estate mortgage loans
Impaired loans
Loans modified as TDRs	300	600	300	600
Residential real estate mortgage loans \| Mortgage loans \| Residential mortgage
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	0
With an allowance recorded	0	0	0	0
Average recorded investment in impaired loans	0	0	0	0
Interest Income Recognized
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Total impaired loans	0	0	0	0
Residential real estate mortgage loans \| Mortgage loans \| Home equity
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	0
With an allowance recorded	0	0	0	0
Average recorded investment in impaired loans	0	0	0	0
Interest Income Recognized
With no related allowance recorded	0	0	0	0
With an allowance recorded	0	0	0	0
Total impaired loans	0	0	0	0
Commercial, industrial and agricultural loans
Impaired loans
Loans modified as TDRs	8,400		12,600	6,900
Commercial, industrial and agricultural loans \| Secured
Recorded Investment
With no related allowance recorded	244		244		8,234
With an allowance recorded	9,643		9,643		2,721
Total impaired loans	9,887		9,887		10,955
Unpaid Principal Balance
With no related allowance recorded	244		244		8,234
With an allowance recorded	9,643		9,643		2,721
Total impaired loans	9,887		9,887		10,955
Related Allocated Allowance
With an allowance recorded	3,421		3,421		189
Total impaired loans	3,421		3,421		189
Average Recorded Investment
With no related allowance recorded	244	8,086	190	8,130
With an allowance recorded	6,642	0	5,044	0
Average recorded investment in impaired loans	6,886	8,086	5,234	8,130
Interest Income Recognized
With no related allowance recorded	5	57	11	171
With an allowance recorded	61	0	138	0
Total impaired loans	66	57	149	171
Commercial, industrial and agricultural loans \| Unsecured
Recorded Investment
With no related allowance recorded	9,330		9,330		5,316
With an allowance recorded	2,332		2,332		0
Total impaired loans	11,662		11,662		5,316
Unpaid Principal Balance
With no related allowance recorded	9,330		9,330		5,316
With an allowance recorded	2,332		2,332		0
Total impaired loans	11,662		11,662		5,316
Related Allocated Allowance
With an allowance recorded	1,268		1,268
Total impaired loans	1,268		1,268
Average Recorded Investment
With no related allowance recorded	7,836	5,143	5,851	5,084
With an allowance recorded	2,340	0	1,707	0
Average recorded investment in impaired loans	10,176	5,143	7,558	5,084
Interest Income Recognized
With no related allowance recorded	125	42	274	118
With an allowance recorded	26	0	61	0
Total impaired loans	151	$ 42	335	$ 118
Taxi medallion loans
Impaired loans
Loans modified as TDRs			$ 2,500		$ 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			2		3
Non-recurring basis
Recorded Investment
With an allowance recorded	12,000		$ 12,000		$ 2,700
Related Allocated Allowance
With an allowance recorded	4,700		4,700		200
Non-recurring basis \| Carrying Amount
Related Allocated Allowance
With an allowance recorded	0		0
Interest Income Recognized
Other real estate					175
Non-recurring basis \| Carrying Amount \| Other real estate owned
Interest Income Recognized
Other real estate	$ 0		$ 0		$ 200

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