Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME (LOSS) - tax effects for each component (Details)

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OTHER COMPREHENSIVE INCOME (LOSS) - tax effects for each component (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment Securities Before Tax Amount [Abstract]      
Change in net unrealized gain/loss on securities available for sale before tax $ 2,437 $ 3,790 $ (409)
Amortization of unrealized losses on securities transferred from available for sale to held to maturity before tax 36 43 55
Total Investment Securities 2,473 3,833 (354)
Change in net unrealized gain (loss) on effective cash flow derivative, before tax 574 0 0
Benefit Plans:      
Reclassification adjustment for amortization of prior service cost (880) 15 199
Reclassification adjustment for amortization of net loss 4,391 4,623 5,299
Current year actuarial (loss) gain (27,924) (7,642) (815)
Total Benefit Plans (24,413) (3,004) 4,683
Total Other Comprehensive Loss Before Tax (21,366) 829 4,329
Investment Securities Tax Expense (Benefit) [Abstract]      
Change in net unrealized gain/loss on securities available for sale tax (628) (950) 103
Amortization of unrealized losses on securities transferred from available for sale to held to maturity tax expense (benefit) (9) (11) (14)
Total Investment Securities, tax (637) (961) 89
Change in net unrealized gain (loss) on effective cash flow derivative, tax (146)    
Benefit Plans:      
Reclassification adjustment for amortization of prior service cost 223 (4) (50)
Reclassification adjustment for amortization of net loss (1,113) (1,170) (1,346)
Current year actuarial gain (loss) 7,078 1,940 207
Total Benefit Plans 6,188 766 (1,189)
Total Other Comprehensive Loss, tax 5,405 (195) (1,100)
Investment Securities Net of Tax Amount [Abstract]      
Change in net unrealized gain/loss on securities available for sale Net of Tax amount 1,809 2,840 (306)
Amortization of unrealized losses on securities transferred from available for sale to held to maturity net of tax 27 32 41
Total Investment Securities, net of tax 1,836 2,872 (265)
Change in net unrealized gain (loss) on effective cash flow derivative, Net of Tax 428    
Benefit Plans:      
Reclassification adjustment for amortization of prior service cost (657) 11 149
Reclassification adjustment for amortization of net loss 3,278 3,453 3,953
Current year actuarial gain (loss) (20,846) (5,702) (608)
Total Benefit Plans (18,225) (2,238) 3,494
Total Other Comprehensive Loss After Tax $ (15,961) $ 634 $ 3,229