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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance $ 44,563 $ 43,247 $ 43,718 $ 43,610
Provision for loan losses 450 0 1,150 0
Loans charged-off (170) (773) (934) (1,535)
Recoveries 654 379 1,563 778
Net loan recoveries 484 (394) 629 (757)
Ending balance 45,497 42,853 45,497 42,853
Commercial and Industrial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 20,219 20,935 20,272 21,564
Provision for loan losses (612) (715) (791) (1,057)
Loans charged-off (44) (168) (430) (542)
Recoveries 364 268 876 355
Net loan recoveries 320 100 446 (187)
Ending balance 19,927 20,320 19,927 20,320
Commercial Real Estate and Multi-Family Residential Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 13,775 12,637 13,452 12,473
Provision for loan losses 426 650 744 771
Loans charged-off 0 (331) (259) (499)
Recoveries 246 17 510 228
Net loan recoveries 246 (314) 251 (271)
Ending balance 14,447 12,973 14,447 12,973
Agri-business and Agricultural Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 3,870 3,047 3,532 2,445
Provision for loan losses 425 56 753 649
Loans charged-off 0 0 0 0
Recoveries 7 5 17 14
Net loan recoveries 7 5 17 14
Ending balance 4,302 3,108 4,302 3,108
Other Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 568 365 461 574
Provision for loan losses 108 18 215 (191)
Loans charged-off 0 0 0 0
Recoveries 0 0 0 0
Net loan recoveries 0 0 0 0
Ending balance 676 383 676 383
Consumer 1-4 Family Mortgage Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 2,689 2,934 2,827 3,395
Provision for loan losses 30 72 (170) (295)
Loans charged-off (40) (224) (53) (354)
Recoveries 11 69 86 105
Net loan recoveries (29) (155) 33 (249)
Ending balance 2,690 2,851 2,690 2,851
Other Consumer [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 389 333 387 319
Provision for loan losses 15 70 75 118
Loans charged-off (86) (50) (192) (140)
Recoveries 26 20 74 76
Net loan recoveries (60) (30) (118) (64)
Ending balance 344 373 344 373
Unallocated [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Beginning balance 3,053 2,996 2,787 2,840
Provision for loan losses 58 (151) 324 5
Loans charged-off 0 0 0 0
Recoveries 0 0 0 0
Net loan recoveries 0 0 0 0
Ending balance $ 3,111 $ 2,845 $ 3,111 $ 2,845