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Other Comprehensive Income (Loss) - Activity in AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at Beginning $ 576,202 $ 549,405  
Net current-period other comprehensive income (14,386) 1,425  
Balances at Ending 579,411 563,518  
Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at Beginning (13,005) (7,915)  
Other comprehensive loss before reclassifications (14,610) 1,197  
Amounts reclassified from accumulated other comprehensive (loss) income (94) 0  
Net current-period other comprehensive income (14,704) 1,197  
Adoption of ASU 2016-01     $ 65
Balances at Ending (27,644) (6,718)  
Employee Benefit Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at Beginning (38,291) (29,194)  
Other comprehensive loss before reclassifications 0 0  
Amounts reclassified from accumulated other comprehensive (loss) income 318 228  
Net current-period other comprehensive income 318 228  
Balances at Ending (37,973) (28,966)  
Accumulated Other Comprehensive (Loss) Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balances at Beginning (51,296) (37,109)  
Other comprehensive loss before reclassifications (14,610) 1,197  
Amounts reclassified from accumulated other comprehensive (loss) income 224 228  
Net current-period other comprehensive income (14,386) 1,425  
Adoption of ASU 2016-01     $ 65
Balances at Ending $ (65,617) $ (35,684)