Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018	Jan. 01, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 222,542	[1]	$ 208,717
Net unrealized gains (losses) on securities available for sale, net of tax	3,080		(2,873)
Reclassification adjustment for realized gains on securities, net of tax	(3)		(6)
Reclassification for ASU 2016-01 adoption				$ 0
Unrealized losses on cash flow hedges	(563)
Ending Balance	229,473		209,840
Net unrealized gains (losses) on securities available for sale, tax	889		(861)
Reclassification adjustment for realized gains on securities, tax	(1)		(2)
Tax effect	(162)
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect			(650)
Net Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(3,973)		(796)
Net unrealized gains (losses) on securities available for sale, net of tax	3,080		(2,873)
Reclassification adjustment for realized gains on securities, net of tax	(3)		(6)
Ending Balance	(896)		(4,325)
Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect			(650)
Unrealized Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			0
Ending Balance			0
Unrealized Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(624)
Unrealized losses on cash flow hedges	(563)
Ending Balance	(1,187)
Adjustments Related to Pension Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,238)		(2,280)
Ending Balance	(1,238)		(2,280)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(5,835)		(3,076)
Ending Balance	$ (3,321)		$ (6,605)

[1] Derived from audited consolidated financial statements.