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ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY (Allowance for loan losses by portfolio segment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 47,121 $ 43,718 $ 43,610
Provision for loan losses 6,400 3,000 1,150
Loans charged-off (6,111) (1,560) (2,055)
Recoveries 1,043 1,963 1,013
Net loans charged-off/(recovered) (5,068) 403 (1,042)
Ending balance 48,453 47,121 43,718
Commercial and Industrial Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 21,097 20,272 21,564
Provision for loan losses 5,884 614 (952)
Loans charged-off (5,215) (842) (801)
Recoveries 752 1,053 461
Net loans charged-off/(recovered) (4,463) 211 (340)
Ending balance 22,518 21,097 20,272
Commercial Real Estate and Multi-Family Residential Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 14,714 13,452 12,473
Provision for loan losses 1,140 997 1,209
Loans charged-off (491) (406) (566)
Recoveries 30 671 336
Net loans charged-off/(recovered) (461) 265 (230)
Ending balance 15,393 14,714 13,452
Agri-business and Agricultural Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 4,920 3,532 2,445
Provision for loan losses (657) 1,365 1,068
Loans charged-off 0 0 0
Recoveries 42 23 19
Net loans charged-off/(recovered) 42 23 19
Ending balance 4,305 4,920 3,532
Other Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 577 461 574
Provision for loan losses (209) 116 (113)
Loans charged-off 0 0 0
Recoveries 0 0 0
Net loans charged-off/(recovered) 0 0 0
Ending balance 368 577 461
Consumer 1-4 Family Mortgage Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,768 2,827 3,395
Provision for loan losses (536) (105) (197)
Loans charged-off (48) (53) (478)
Recoveries 108 99 107
Net loans charged-off/(recovered) 60 46 (371)
Ending balance 2,292 2,768 2,827
Other Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 379 387 319
Provision for loan losses 150 134 188
Loans charged-off (357) (259) (210)
Recoveries 111 117 90
Net loans charged-off/(recovered) (246) (142) (120)
Ending balance 283 379 387
Unallocated [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,666 2,787 2,840
Provision for loan losses 628 (121) (53)
Loans charged-off 0 0 0
Recoveries 0 0 0
Net loans charged-off/(recovered) 0 0 0
Ending balance $ 3,294 $ 2,666 $ 2,787