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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 43,610 $ 46,262 $ 48,797
Provision for loan losses (1,150) 0 0
Loans charged-off (2,055) (3,173) (4,685)
Recoveries 1,013 521 2,150
Net loans charged-off (1,042) (2,652) (2,535)
Ending balance 43,718 43,610 46,262
Commercial and Industrial Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 21,564 22,785 21,005
Provision for loan losses (952) (117) 2,307
Loans charged-off (801) (1,320) (1,441)
Recoveries 461 216 914
Net loans charged-off (340) (1,104) (527)
Ending balance 20,272 21,564 22,785
Commercial Real Estate and Multi-Family Residential Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 12,473 14,153 18,556
Provision for loan losses 1,209 (673) (2,771)
Loans charged-off (566) (1,114) (2,560)
Recoveries 336 107 928
Net loans charged-off (230) (1,007) (1,632)
Ending balance 13,452 12,473 14,153
Agri-business and Agricultural Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,445 1,790 1,682
Provision for loan losses 1,068 635 88
Loans charged-off 0 0 0
Recoveries 19 20 20
Net loans charged-off 19 20 20
Ending balance 3,532 2,445 1,790
Other Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 574 276 391
Provision for loan losses (113) 420 (115)
Loans charged-off 0 (122) 0
Recoveries 0 0 0
Net loans charged-off 0 (122) 0
Ending balance 461 574 276
Consumer 1-4 Family Mortgage Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 3,395 3,459 3,046
Provision for loan losses (197) 246 699
Loans charged-off (478) (362) (439)
Recoveries 107 52 153
Net loans charged-off (371) (310) (286)
Ending balance 2,827 3,395 3,459
Other Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 319 483 608
Provision for loan losses 188 (35) (15)
Loans charged-off (210) (255) (245)
Recoveries 90 126 135
Net loans charged-off (120) (129) (110)
Ending balance 387 319 483
Unallocated [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,840 3,316 3,509
Provision for loan losses (53) (476) (193)
Loans charged-off 0 0 0
Recoveries 0 0 0
Net loans charged-off 0 0 0
Ending balance $ 2,787 $ 2,840 $ 3,316