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Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pre-Tax Amount      
Other Comprehensive Income (Loss) $ (6,267) $ 4,075 $ (4,180)
Tax (Expense) Benefit      
Other Comprehensive Income (Loss) 1,624 (1,402) 1,556
Net of Tax Amount      
Other comprehensive income (loss), net of tax (4,643) 2,673 (2,624)
Accumulated Net Investment Gain (Loss) Attributable to Parent      
Pre-Tax Amount      
Net change in unrealized gains on securities available-for-sale (1,275) (2,899) (663)
Net available-for-sale securities losses (gains) reclassified into earnings (3,000) 0 34
Tax (Expense) Benefit      
Net change in unrealized gains on securities available-for-sale 448 1,006 232
Net available-for-sale securities losses (gains) reclassified into earnings 1,054 0 (12)
Net of Tax Amount      
Net change in unrealized gains on securities available-for-sale (827) (1,893) (431)
Net available-for-sale securities losses (gains) reclassified into earnings (1,946) 0 22
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent      
Pre-Tax Amount      
Other Comprehensive Income (Loss) (1,992) 6,974 (3,551)
Tax (Expense) Benefit      
Other Comprehensive Income (Loss) 122 (2,408) 1,336
Net of Tax Amount      
Other comprehensive income (loss), net of tax $ (1,870) $ 4,566 $ (2,215)