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LOANS (Total Loans Outstanding) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 3,533,138 $ 3,471,668    
Percentage of Total commercial loans 100.00%      
Percentage of Total consumer loans   100.00%    
Less: Allowance for loan losses $ (43,774) $ (43,718) $ (43,284) $ (43,610)
Net deferred loan fees (859) (741)    
Loans, net 3,488,505 3,427,209    
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 3,128,308 $ 3,062,526    
Percentage of Total commercial loans 88.60%      
Percentage of Total consumer loans   88.20%    
Other consumer loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 60,881 $ 61,308    
Percentage of Total commercial loans 1.70%      
Percentage of Total consumer loans   1.80%    
Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 404,830 $ 409,142    
Percentage of Total commercial loans 11.40%      
Percentage of Total consumer loans   11.80%    
Commercial and Industrial Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Less: Allowance for loan losses $ (19,781) $ (20,272) (20,465) (21,564)
Commercial and Industrial Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 1,324,065 $ 1,268,490    
Percentage of Total commercial loans 37.50%      
Percentage of Total consumer loans   36.50%    
Commercial and Industrial Loans [Member] | Working Capital Lines Of Credit Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 650,691 $ 624,404    
Percentage of Total commercial loans 18.40%      
Percentage of Total consumer loans   18.00%    
Commercial and Industrial Loans [Member] | Non-working Capital Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 673,374 $ 644,086    
Percentage of Total commercial loans 19.10%      
Percentage of Total consumer loans   18.50%    
Commercial Real Estate and Multi-family Residential Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 1,370,972 $ 1,300,923    
Percentage of Total commercial loans 38.80%      
Percentage of Total consumer loans   37.50%    
Commercial Real Estate and Multi-family Residential Loans [Member] | Construction and Land Development Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 238,018 $ 245,182    
Percentage of Total commercial loans 6.70%      
Percentage of Total consumer loans   7.10%    
Commercial Real Estate and Multi-family Residential Loans [Member] | Owner Occupied Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 468,621 $ 469,705    
Percentage of Total commercial loans 13.30%      
Percentage of Total consumer loans   13.50%    
Commercial Real Estate and Multi-family Residential Loans [Member] | Nonowner Occupied Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 463,186 $ 458,404    
Percentage of Total commercial loans 13.10%      
Percentage of Total consumer loans   13.20%    
Commercial Real Estate and Multi-family Residential Loans [Member] | Multifamily Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 201,147 $ 127,632    
Percentage of Total commercial loans 5.70%      
Percentage of Total consumer loans   3.70%    
Agri-business and Agricultural Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Less: Allowance for loan losses $ (3,459) $ (3,532) $ (2,454) $ (2,445)
Agri-business and Agricultural Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 327,587 $ 394,843    
Percentage of Total commercial loans 9.30%      
Percentage of Total consumer loans   11.40%    
Agri-business and Agricultural Loans [Member] | Loans Secured By Farmland [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 138,071 $ 172,633    
Percentage of Total commercial loans 3.90%      
Percentage of Total consumer loans   5.00%    
Agri-business and Agricultural Loans [Member] | Loans For Agricultural Production [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 189,516 $ 222,210    
Percentage of Total commercial loans 5.40%      
Percentage of Total consumer loans   6.40%    
Other Commercial Loans [Member] | Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 105,684 $ 98,270    
Percentage of Total commercial loans 3.00%      
Percentage of Total consumer loans   2.80%    
Total Consumer 1 To 4 Family Mortgage Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 343,949 $ 347,834    
Percentage of Total commercial loans 9.70%      
Percentage of Total consumer loans   10.00%    
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Closed End First Mortgage Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 166,158 $ 163,155    
Percentage of Total commercial loans 4.70%      
Percentage of Total consumer loans   4.70%    
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Open End And Junior Lien Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 167,517 $ 169,664    
Percentage of Total commercial loans 4.70%      
Percentage of Total consumer loans   4.90%    
Total Consumer 1 To 4 Family Mortgage Loans [Member] | Residential Construction and Land Development Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial And Consumer Loans $ 10,274 $ 15,015    
Percentage of Total commercial loans 0.30%      
Percentage of Total consumer loans   0.40%