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 ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investment Securities Before Tax Amount [Abstract]      
Change in net unrealized gain/loss on securities available for sale before tax $ 3,790,000 $ (409,000) $ (1,459,000)
Amortization of unrealized losses on securities transferred from available for sale to held to maturity before tax 43,000 55,000 73,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent 3,833,000 (354,000) (1,386,000)
Benefit Plans:      
Reclassification adjustment for amortization of prior service cost (15,000) (199,000) (223,000)
Reclassification adjustment for amortization of net loss 4,623,000 5,299,000 4,409,000
Current year actuarial (loss) gain (7,642,000) (815,000) (3,470,000)
Total Benefit Plans 3,004,000 (4,683,000) (1,162,000)
Total Other Comprehensive Loss Before Tax 829,000 4,329,000 (224,000)
Investment Securities Tax Expense (Benefit) [Abstract]      
Change in net unrealized gain/loss on securities available for sale tax expense (benefit) 950,000 103,000 564,000
Amortization of unrealized losses on securities transferred from available for sale to held to maturity tax expense (benefit) (11,000) (14,000) (29,000)
Other Comprehensive Income Loss Available For SaleSecurities Tax (961,000) 89,000 535,000
Benefit Plans:      
Reclassification adjustment for amortization of prior service cost (4,000) (50,000) (86,000)
Reclassification adjustment for amortization of net loss (1,170,000) (1,346,000) (1,622,000)
Current year actuarial gain (loss) 1,940,000 207,000 1,159,000
Total Benefit Plans 766,000 (1,189,000) (549,000)
Total Other Comprehensive Loss Tax (195,000) (1,100,000) (14,000)
Investment Securities Net of Tax Amount [Abstract]      
Change in net unrealized gain/loss on securities available for sale Net of Tax amount (2,840,000) (306,000) (895,000)
Amortization of unrealized losses on securities transferred from available for sale to held to maturity net of tax 32,000 41,000 44,000
Total other comprehensive income (loss) Net of Tax 2,872,000 (265,000) (851,000)
Benefit Plans:      
Reclassification adjustment for amortization of prior service cost 11,000 149,000 137,000
Reclassification adjustment for amortization of net loss 3,453,000 3,953,000 2,787,000
Current year actuarial gain (loss) (5,702,000) (608,000) (2,311,000)
Total Benefit Plans (2,238,000) 3,494,000 613,000
Total Other Comprehensive Loss After Tax $ 634,000 $ 3,229,000 $ (238,000)