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BENEFIT PLANS, Funded Status and Amounts Recognized in Balance Sheets and AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2009
May 12, 2017
Change in plan assets [Roll Forward]          
Fair value of plan assets at beginning of year [1] $ 180,086        
Fair value of plan assets at end of year [1] 216,476 $ 180,086      
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI") [Abstract]          
AOCI at year end $ 21,633 17,961 $ 21,283    
Accumulated other comprehensive income (loss), negative postretirement medical plan amendment, arising during period, net of tax       $ 3,500  
Stock Balance Plan [Member] | Nonemployee Directors [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Funding Status [Extensible List] us-gaap:UnfundedPlanMember        
Change in benefit obligation [Roll Forward]          
Benefit obligation at the beginning of year $ 100        
Benefit obligation at end of year 100 100      
Pension Benefits [Member]          
Change in benefit obligation [Roll Forward]          
Benefit obligation at the beginning of year 127,084 127,134      
Service cost 4,181 4,106 3,324    
Interest cost 5,717 5,624 5,506    
Plan amendment / acquisition 11,646 22      
Participant contributions 0 0      
Deferred actuarial loss/(gain) 8,978 (1,628)      
Benefits paid (10,156) (8,174)      
Benefit obligation at end of year 147,450 127,084 127,134    
Change in plan assets [Roll Forward]          
Fair value of plan assets at beginning of year 180,400 172,026      
Actual return of plan assets 22,954 14,402      
Participant contributions 0 0      
Employer contributions 9,839 2,146      
Plan acquisition 14,070 0      
Benefits paid (10,156) (8,174)      
Fair value of plan assets at end of year 217,107 180,400 172,026    
Over/(Under) funded status at year end 69,657 53,316      
Amounts recognized in the consolidated statement of condition [Abstract]          
Other assets 81,000 64,709      
Other liabilities (11,343) (11,393)      
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI") [Abstract]          
Net loss 26,935 28,323      
Net prior service cost (credit) 2,944 2,264      
Pre-tax AOCI 29,879 30,587      
Taxes (7,340) (11,622)      
AOCI at year end $ 22,539 $ 18,965      
Unamortized actuarial gain         $ 1,900
Discount rate 4.00% 4.50%     4.40%
Post-retirement Benefits [Member]          
Change in benefit obligation [Roll Forward]          
Benefit obligation at the beginning of year $ 1,806 $ 1,918      
Service cost 0 0 0    
Interest cost 76 82 87    
Plan amendment / acquisition 0 0      
Participant contributions 467 516      
Deferred actuarial loss/(gain) 245 174      
Benefits paid (809) (884)      
Benefit obligation at end of year 1,785 1,806 1,918    
Change in plan assets [Roll Forward]          
Fair value of plan assets at beginning of year 0 0      
Actual return of plan assets 0 0      
Participant contributions 467 516      
Employer contributions 342 368      
Plan acquisition 0 0      
Benefits paid (809) (884)      
Fair value of plan assets at end of year 0 0 $ 0    
Over/(Under) funded status at year end (1,785) (1,806)      
Amounts recognized in the consolidated statement of condition [Abstract]          
Other assets 0 0      
Other liabilities (1,785) (1,806)      
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI") [Abstract]          
Net loss 420 183      
Net prior service cost (credit) (1,622) (1,801)      
Pre-tax AOCI (1,202) (1,618)      
Taxes 296 614      
AOCI at year end $ (906) $ (1,004)      
Discount rate 4.00% 4.40%      
Supplemental Pension Plans [Member] | Key Executives [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Funding Status [Extensible List] us-gaap:UnfundedPlanMember        
Change in benefit obligation [Roll Forward]          
Benefit obligation at the beginning of year $ 11,300        
Benefit obligation at end of year 11,300 $ 11,300      
Amounts recognized in accumulated other comprehensive income (loss) ("AOCI") [Abstract]          
Benefit obligation for defined benefit pension plan prior to plan revaluation $ 136,100 $ 115,700      
[1] Excludes dividends and interest receivable totaling $0.6 million and $0.3 million at December 31, 2017 and 2016, respectively.