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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Pension and other post-retirement obligations:      
Amortization of actuarial losses included in net periodic pension cost, gross $ 303 $ 265  
Tax effect (74) (102)  
Amortization of actuarial losses included in net periodic pension cost, net 229 163  
Amortization of prior service cost included in net periodic pension cost, gross (127) (31)  
Tax effect 31 12  
Amortization of prior service cost included in net periodic pension cost, net (96) (19)  
Other comprehensive income related to pension and other post-retirement obligations, net of taxes 133 144  
Unrealized (losses) gains on available-for-sale securities:      
Net unrealized holding (losses) gains arising during period, gross (41,815) 3,893  
Tax effect 10,155 (1,526)  
Net unrealized holding (losses) gains arising during period, net (31,660) 2,367  
Other comprehensive (loss)/income related to unrealized (losses) gains on available-for-sale securities, net of taxes (31,660) 2,367  
Other comprehensive (loss) income, net of tax (31,527) 2,511  
Net income 40,106 26,257  
Comprehensive income 8,579 $ 28,768  
Accumulated Other Comprehensive Income By Component:      
Unrealized loss for pension and other postretirement obligations (28,501)   $ (28,677)
Tax effect 7,001   7,044
Net unrealized loss for pension and other postretirement obligations (21,500)   (21,633)
Unrealized (loss)/gain on available-for-sale securities (17,875)   23,940
Tax effect 4,149   (6,006)
Net unrealized (loss)/gain on available-for-sale securities (13,726)   17,934
Accumulated other comprehensive loss $ (35,226)   $ (3,699)