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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Allowance for loan losses by portfolio segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 49,562	$ 45,627	$ 48,453	$ 47,121
Provision for loan losses	785	1,700	1,985	5,000
Loans charged-off	(84)	(128)	(368)	(5,105)
Recoveries	301	507	494	690
Net loans charged-off/(recovered)	217	379	126	(4,415)
Ending balance	50,564	47,706	50,564	47,706
Commercial and Industrial Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	24,030	20,725	22,518	21,097
Provision for loan losses	824	1,392	2,317	5,294
Loans charged-off	(17)	(57)	(100)	(4,417)
Recoveries	187	464	289	550
Net loans charged-off/(recovered)	170	407	189	(3,867)
Ending balance	25,024	22,524	25,024	22,524
Commercial Real Estate and Multi-family Residential Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	15,447	14,438	15,393	14,714
Provision for loan losses	(31)	508	(13)	715
Loans charged-off	0	0	0	(491)
Recoveries	76	8	112	16
Net loans charged-off/(recovered)	76	8	112	(475)
Ending balance	15,492	14,954	15,492	14,954
Agri-business and Agricultural Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,146	4,848	4,305	4,920
Provision for loan losses	(242)	(268)	(403)	(344)
Loans charged-off	0	0	0	0
Recoveries	2	5	4	9
Net loans charged-off/(recovered)	2	5	4	9
Ending balance	3,906	4,585	3,906	4,585
Other Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	373	510	368	577
Provision for loan losses	(18)	(46)	(13)	(113)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans charged-off/(recovered)	0	0	0	0
Ending balance	355	464	355	464
Consumer 1-4 Family Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	2,266	2,018	2,292	2,768
Provision for loan losses	(124)	(68)	(79)	(862)
Loans charged-off	(5)	0	(87)	(7)
Recoveries	16	3	27	54
Net loans charged-off/(recovered)	11	3	(60)	47
Ending balance	2,153	1,953	2,153	1,953
Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	291	245	283	379
Provision for loan losses	40	65	125	16
Loans charged-off	(62)	(71)	(181)	(190)
Recoveries	20	27	62	61
Net loans charged-off/(recovered)	(42)	(44)	(119)	(129)
Ending balance	289	266	289	266
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,009	2,843	3,294	2,666
Provision for loan losses	336	117	51	294
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans charged-off/(recovered)	0	0	0	0
Ending balance	$ 3,345	$ 2,960	$ 3,345	$ 2,960

X

- Definition

Reflects the amount of loans and leases that have been removed after recoveries, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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