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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Pension and other post retirement obligations:          
Amortization of actuarial losses included in net periodic pension cost, gross $ 2,068 $ 376 $ 2,333 $ 751  
Tax effect (790) (144) (892) (288)  
Amortization of actuarial losses included in net periodic pension cost, net 1,278 232 1,441 463  
Amortization of prior service cost included in net periodic pension cost, gross (28) (34) (59) (67)  
Tax effect 10 13 22 25  
Amortization of prior service cost included in net periodic pension cost, net (18) (21) (37) (42)  
Other comprehensive income related to pension and other post retirement obligations, net of taxes 1,260 211 1,404 421  
Unrealized gains on available-for-sale securities:          
Net unrealized holding gains arising during period, gross 9,760 31,540 13,653 98,796  
Tax effect (3,732) (12,003) (5,258) (37,417)  
Net unrealized holding gains arising during period, net 6,028 19,537 8,395 61,379  
Other comprehensive income related to unrealized gains on available-for-sale securities, net of taxes 6,028 19,537 8,395 61,379  
Other comprehensive income, net of tax 7,288 19,748 9,799 61,800  
Net income 17,191 25,857 43,448 50,260  
Comprehensive income 24,479 $ 45,605 53,247 $ 112,060  
Accumulated Other Comprehensive Income By Component:          
Unrealized loss for pension and other post-retirement obligations (26,695)   (26,695)   $ (28,969)
Tax effect 10,138   10,138   11,008
Net unrealized loss for pension and other post-retirement obligations (16,557)   (16,557)   (17,961)
Unrealized gain on available-for-sale securities 55,446   55,446   41,793
Tax effect (21,247)   (21,247)   (15,989)
Net unrealized gain on available-for-sale securities 34,199   34,199   25,804
Accumulated other comprehensive income $ 17,642   $ 17,642   $ 7,843