Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 311,917	$ 213,348	$ 222,542	[1]	$ 208,717
Net unrealized gains (losses) on securities available for sale, net of tax	1,192	(1,525)	7,458		(5,519)
Reclassification adjustment for realized gains on securities, net of tax	(80)	(57)	(188)		(63)
Unrealized losses on cash flow hedges, net of tax		340
Unrealized losses on cash flow hedges, net of tax	(668)
Ending Balance	317,246	216,066	317,246		216,066
Net unrealized gains (losses) on securities available for sale, tax	344	(440)	2,153		(1,626)
Reclassification adjustment for realized gains on securities, tax	(22)	(16)	(54)		(18)
Tax effect	(194)	98	(599)		45
Net Unrealized Gains (Losses) on Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	2,185	(5,446)	(3,973)		(796)
Net unrealized gains (losses) on securities available for sale, net of tax	1,192	(1,525)	7,458		(5,519)
Reclassification adjustment for realized gains on securities, net of tax	(80)	(57)	(188)		(63)
Change in accounting for late charges						$ (650)
Ending Balance	3,297	(7,028)	3,297		(7,028)
Unrealized Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		(184)	(624)
Unrealized losses on cash flow hedges, net of tax		340			156
Unrealized losses on cash flow hedges, net of tax			(2,074)
Ending Balance	(2,698)	156	(2,698)		156
Unrealized Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(2,030)
Unrealized losses on cash flow hedges, net of tax	(668)
Ending Balance	(2,698)		(2,698)
Adjustments Related to Pension Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,238)	(2,280)	(1,238)		(2,280)
Ending Balance	(1,238)	(2,280)	(1,238)		(2,280)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(1,083)	(7,910)	(5,835)		(3,076)
Change in accounting for late charges						$ (650)
Unrealized losses on cash flow hedges, net of tax					156
Unrealized losses on cash flow hedges, net of tax			(2,074)
Ending Balance	$ (639)	$ (9,152)	$ (639)		$ (9,152)

[1] Derived from audited consolidated financial statements.