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Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 201,380 [1] $ 197,835
Net unrealized gains (losses) on securities available for sale, net of tax 657 1,444
Reclassification adjustment for gains on sales of securities, net of tax (168) (238)
Ending Balance 204,241 200,443
Net unrealized gains (losses) on securities available for sale, tax 354 778
Reclassification adjustment for gains on sales of securities, tax (91) (128)
Net Unrealized Gains (Losses) on Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (150) 4,122
Net unrealized gains (losses) on securities available for sale, net of tax 657 1,444
Reclassification adjustment for gains on sales of securities, net of tax (168) (238)
Ending Balance 339 5,328
Adjustments Related to Pension Benefits    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (1,724) (1,832)
Ending Balance (1,724) (1,832)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (1,874) 2,290
Ending Balance $ (1,385) $ 3,496
[1] Derived from audited consolidated financial statements.