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Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Net Investment Gain (Loss) Attributable to Parent      
Pre-Tax Amount      
Net change in unrealized gains on securities available-for-sale $ (2,899) $ (663) $ 11,825
Net available-for-sale securities losses (gains) reclassified into earnings 0 (34) 41
Tax (Expense) Benefit      
Net change in unrealized gains on securities available-for-sale 1,006 232 (4,139)
Net available-for-sale securities losses (gains) reclassified into earnings 0 (12) 15
Net of Tax Amount      
Net change in unrealized gains on securities available-for-sale (1,893) (431) 7,686
Net available-for-sale securities losses (gains) reclassified into earnings 0 22 (26)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent      
Pre-Tax Amount      
Other Comprehensive Income (Loss), before Tax 6,974 (3,551) (13,394)
Tax (Expense) Benefit      
Other Comprehensive Income (Loss), Tax (2,408) 1,336 4,595
Net of Tax Amount      
Other Comprehensive Income (Loss), Net of Tax 4,566 (2,215) (8,799)
Accumulated Other Comprehensive Income (Loss)      
Pre-Tax Amount      
Other Comprehensive Income (Loss), before Tax (4,075) 4,180 1,610
Tax (Expense) Benefit      
Other Comprehensive Income (Loss), Tax 1,402 (1,556) (471)
Net of Tax Amount      
Other Comprehensive Income (Loss), Net of Tax $ (2,673) $ 2,624 $ 1,139