XML 123 R107.htm IDEA: XBRL DOCUMENT v3.8.0.1
Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at beginning $ 549,405 $ 516,466 $ 489,583
Balances at ending 576,202 549,405 516,466
Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at beginning (7,915) (2,744) 2,867
Other comprehensive loss (2,437) (5,171) (5,611)
Balances at ending (13,005) (7,915) (2,744)
Employee Benefit Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at beginning (29,194) (28,257) (26,878)
Other comprehensive loss (1,792) (937) (1,379)
Balances at ending (38,291) (29,194) (28,257)
Accumulated Other Comprehensive Income (loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at beginning (37,109) (31,001) (24,011)
Other comprehensive loss (4,229) (6,108) (6,990)
Balances at ending $ (51,296) $ (37,109) $ (31,001)