ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Allowance for loan losses by portfolio segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 44,816	$ 45,605	$ 46,262	$ 48,797
Provision for loan losses	0	0	0	0
Loans charged-off	(228)	(269)	(1,931)	(3,675)
Recoveries	106	1,051	363	1,265
Net loans charged-off	(122)	782	(1,568)	(2,410)
Ending balance	44,694	46,387	44,694	46,387
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	22,360	20,922	22,785	21,005
Provision for loan losses	(88)	919	240	1,296
Loans charged-off	(2)	(147)	(878)	(660)
Recoveries	43	291	166	344
Net loans charged-off	41	144	(712)	(316)
Ending balance	22,313	21,985	22,313	21,985
Commercial Real Estate and Multi-Family Residential Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	13,112	15,975	14,153	18,557
Provision for loan losses	(235)	(1,275)	(856)	(1,334)
Loans charged-off	0	0	(459)	(2,553)
Recoveries	14	670	53	701
Net loans charged-off	14	670	(406)	(1,852)
Ending balance	12,891	15,370	12,891	15,370
Agri-business and Agricultural Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	1,881	1,404	1,790	1,682
Provision for loan losses	103	(34)	184	(323)
Loans charged-off	0	0	0	0
Recoveries	5	5	15	16
Net loans charged-off	5	5	15	16
Ending balance	1,989	1,375	1,989	1,375
Other Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	358	234	276	391
Provision for loan losses	11	76	215	(81)
Loans charged-off	0	0	(122)	0
Recoveries	0	0	0	0
Net loans charged-off	0	0	(122)	0
Ending balance	369	310	369	310
Consumer 1-4 Family Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,473	3,275	3,459	3,045
Provision for loan losses	14	179	149	587
Loans charged-off	(152)	(60)	(292)	(282)
Recoveries	21	59	40	102
Net loans charged-off	(131)	(1)	(252)	(180)
Ending balance	3,356	3,453	3,356	3,453
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	392	487	483	608
Provision for loan losses	(13)	68	(64)	(11)
Loans charged-off	(74)	(62)	(180)	(180)
Recoveries	23	26	89	102
Net loans charged-off	(51)	(36)	(91)	(78)
Ending balance	328	519	328	519
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	3,240	3,308	3,316	3,509
Provision for loan losses	208	67	132	(134)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans charged-off	0	0	0	0
Ending balance	$ 3,448	$ 3,375	$ 3,448	$ 3,375