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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 43,718 $ 43,610 $ 46,262
Provision for loan losses 3,000 1,150 0
Loans charged-off (1,560) (2,055) (3,173)
Recoveries 1,963 1,013 521
Net loans charged-off/(recovered) 403 (1,042) (2,652)
Ending balance 47,121 43,718 43,610
Commercial and Industrial Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 20,272 21,564 22,785
Provision for loan losses 614 (952) (117)
Loans charged-off (842) (801) (1,320)
Recoveries 1,053 461 216
Net loans charged-off/(recovered) 211 (340) (1,104)
Ending balance 21,097 20,272 21,564
Commercial Real Estate and Multi-Family Residential Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 13,452 12,473 14,153
Provision for loan losses 997 1,209 (673)
Loans charged-off (406) (566) (1,114)
Recoveries 671 336 107
Net loans charged-off/(recovered) 265 (230) (1,007)
Ending balance 14,714 13,452 12,473
Agri-business and Agricultural Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 3,532 2,445 1,790
Provision for loan losses 1,365 1,068 635
Loans charged-off 0 0 0
Recoveries 23 19 20
Net loans charged-off/(recovered) 23 19 20
Ending balance 4,920 3,532 2,445
Other Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 461 574 276
Provision for loan losses 116 (113) 420
Loans charged-off 0 0 (122)
Recoveries 0 0 0
Net loans charged-off/(recovered) 0 0 (122)
Ending balance 577 461 574
Consumer 1-4 Family Mortgage Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,827 3,395 3,459
Provision for loan losses (105) (197) 246
Loans charged-off (53) (478) (362)
Recoveries 99 107 52
Net loans charged-off/(recovered) 46 (371) (310)
Ending balance 2,768 2,827 3,395
Other Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 387 319 483
Provision for loan losses 134 188 (35)
Loans charged-off (259) (210) (255)
Recoveries 117 90 126
Net loans charged-off/(recovered) (142) (120) (129)
Ending balance 379 387 319
Unallocated [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,787 2,840 3,316
Provision for loan losses (121) (53) (476)
Loans charged-off 0 0 0
Recoveries 0 0 0
Net loans charged-off/(recovered) 0 0 0
Ending balance $ 2,666 $ 2,787 $ 2,840