Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income, before tax amount	$ 27,307	$ 22,433
Income tax expense (benefit)	5,388	9,540
Net income	21,919	12,893
Investment securities available for sale:
Unrealized holding (losses) gains on securities arising during the period, before tax	(756)	(152)
Unrealized holding (losses) gains on securities arising during the period, tax	(225)	(18)
Unrealized holding (losses) gains on securities arising during the period, net	(531)	(134)
Less: reclassification adjustment for gains on securities included in net income, before tax	(183)	62
Less: reclassification adjustment for gains on securities included in net income, tax	(38)	22
Less: reclassification adjustment for gains on securities included in net income, net of tax	(145)	40
Total unrealized (losses) gains on securities available for sale, before tax	(573)	(214)
Total unrealized (losses) gains on securities available for sale, tax	(187)	(40)
Total unrealized (losses) gains on securities available for sale, net of tax	(386)	(174)
Adjustments related to defined benefit plan:
Adjustments related to defined benefit plan, Amortization of prior service cost, before tax	83	83
Adjustments related to defined benefit plan, Amortization of prior service cost, tax	173	33
Adjustments related to defined benefit plan, Amortization of prior service cost, net of tax	(90)	50
Total adjustments related to defined benefit plan, before tax	83	83
Total adjustments related to defined benefit plan, tax	173	33
Total adjustments related to defined benefit plan, net of tax	(90)	50
Net unrealized gains from cash flow hedges:
Unrealized holding gains on cash flow hedges arising during the period, before tax	25	204
Unrealized holding gains on cash flow hedges arising during the period, tax	(123)	34
Unrealized holding gains on cash flow hedges arising during the period, net of tax	148	170
Total unrealized gains on cash flow hedges, before tax	25	204
Total unrealized gains on cash flow hedges, tax	(123)	34
Total unrealized gains on cash flow hedges, net of tax	148	170
Total other comprehensive income, before tax	(465)	73
Total other comprehensive income, tax	(137)	27
Period change	(328)	46
Total comprehensive income, before tax	26,842	22,506
Total comprehensive income tax	5,251	9,567
Total comprehensive income	$ 21,591	$ 12,939