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RETIREMENT PLANS: (Details 4)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Schedule of Allocation of Plan Assets [Table Text Block]
The Corporation's pension plan weighted-average asset allocation for the years 2017 and 2016 by asset category are as follows:
 
 
Pension Plan
Target Allocation
 
ESOP
Target Allocation
 
Pension
Percentage of Plan
Assets at December 31,
 
ESOP
Percentage of Plan
Assets at December 31,
ASSET CATEGORY
 
2017
 
2017
 
2017
 
2016
 
2017
 
2016
Equity securities
 
25-75%
 
95-99%
 
72
%
 
68
%
 
98
%
 
99
%
Debt securities
 
0-50%
 
0-0%
 
25
%
 
29
%
 
—
%
 
—
%
Other
 
0-20%
 
0-5%
 
3
%
 
3
%
 
2
%
 
1
%
TOTAL
 
 
 
 
 
100
%
 
100
%
 
100
%
 
100
%
  
Percentage of plan assets (percent) 100.00% 100.00%
Employee Stock Ownership Plan    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets (percent) 100.00% 100.00%
Other Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets (percent) 3.00% 3.00%
Other Securities [Member] | Employee Stock Ownership Plan    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of plan assets (percent) 2.00% 1.00%
Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Schedule of Allocation of Plan Assets [Table Text Block] 0  
Percentage of plan assets (percent) 72.00% 68.00%
Equity Securities | Employee Stock Ownership Plan    
Defined Benefit Plan Disclosure [Line Items]    
Schedule of Allocation of Plan Assets [Table Text Block] 0  
Percentage of plan assets (percent) 98.00% 99.00%
Debt securities    
Defined Benefit Plan Disclosure [Line Items]    
Schedule of Allocation of Plan Assets [Table Text Block] 0  
Percentage of plan assets (percent) 25.00% 29.00%
Debt securities | Employee Stock Ownership Plan    
Defined Benefit Plan Disclosure [Line Items]    
Schedule of Allocation of Plan Assets [Table Text Block] 0  
Percentage of plan assets (percent) 0.00% 0.00%
Other Security Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Schedule of Allocation of Plan Assets [Table Text Block] 0  
Other Security Investments [Member] | Employee Stock Ownership Plan    
Defined Benefit Plan Disclosure [Line Items]    
Schedule of Allocation of Plan Assets [Table Text Block] 0