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Accumlated other comprehensive income table (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
 [3]
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Prior Period Reclassification Adjustment [1]   $ 0    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets     $ 177 [2] $ 0
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance $ (1,173) (1,831) (1,337)  
Total other comprehensive income (loss) 19,342 1,886 (494)  
Ending Balance 18,169 (1,173) (1,831)  
Unrealized Gain (Loss) on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Prior Period Reclassification Adjustment   (111)    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   (831)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance (5,947) (504) 173  
Total other comprehensive income (loss) 10,345 (4,501) (677)  
Ending Balance 4,398 (5,947) (504)  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Prior Period Reclassification Adjustment   205    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   0    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance 6,148 948    
Total other comprehensive income (loss) 10,331      
Ending Balance   6,148 948  
Unrealized Gain (Loss) on Cash Flow Hedge        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance     361  
Total other comprehensive income (loss)   4,995 587  
Ending Balance 16,479      
Deferred Gain on Hedge Transactions        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Prior Period Reclassification Adjustment   29    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   0    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance 0 137 281  
Total other comprehensive income (loss) 0 (166) (144)  
Ending Balance 0 0 137  
Defined Benefit Postretirement Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Prior Period Reclassification Adjustment   (520)    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   0    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning Balance (1,374) (2,412) (2,152)  
Total other comprehensive income (loss) (1,334) 1,558 (260)  
Ending Balance (2,708) (1,374) (2,412)  
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Prior Period Reclassification Adjustment [1]   (397)    
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets [3]   (831)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Total other comprehensive income (loss) $ 19,342 $ 1,886 $ (494)  
[1]
Represents adjustment needed to reflect the cumulative impact on retained earnings for reclassification of the income tax effects attributable to accumulated other comprehensive income, as a result of the Tax Cuts and Jobs Act (the "Tax Act"). Pursuant to the Company's adoption of Accounting Standards Update 2018-02, the Company has elected to reclassify amounts stranded in other comprehensive income to retained earnings.
[2]
Represents adjustment needed to reflect the cumulative impact on retained earnings for previously recognized stock based compensation, which included an adjustment for estimated forfeitures. Pursuant to the Company's adoption of Accounting Standards Update 2016-09, the Company has elected to recognize stock based compensation without inclusion of a forfeiture estimate, and as such has recognized this adjustment to present retained earnings consistent with this election.
[3]
Represents adjustment needed to reflect the cumulative impact on retained earnings for the classification and measurement of investments in equity securities. Pursuant to the Company's adoption of Accounting Standards Update 2016-01, the Company's investments in equity securities will no longer be classified as available for sale, therefore the Company was required to reclassify the net unrealized gain recognized on the change in fair value of these equity securities from other comprehensive income to retained earnings.