Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income, before tax amount	$ 7,626	$ 7,635	$ 21,251	$ 22,375
Income tax expense (benefit)	1,866	1,676	4,952	4,842
Net income	5,760	5,959	16,299	17,533
Debt securities available for sale
Unrealized holding gains on securities arising during the period, before tax	(1,060)	153	(728)	1,340
Unrealized holding gains on securities arising during the period, tax	(298)	42	(197)	358
Unrealized holding gains on securities arising during the period, net of tax	(762)	111	(531)	982
Less: reclassification adjustment for (losses) gains on securities included in net income, before tax	(96)	18	(186)	216
Less: reclassification adjustment for (losses) gains on securities included in net income, tax	(20)	3	(38)	45
Less: reclassification adjustment for (losses) gains on securities included in net income, net of tax	(76)	15	(148)	171
Total unrealized gains on securities available for sale, before tax	(964)	135	(542)	1,124
Total unrealized gains on securities available for sale, tax	(278)	39	(159)	313
Total unrealized gains on securities available for sale, net of tax	(686)	96	(383)	811
Adjustments related to defined benefit plan:
Amortization of prior service cost, before tax	20	20	62	62
Amortization of prior service cost, tax	6	5	18	(59)
Amortization of prior service cost, net of tax	14	15	44	121
Total adjustments related to defined benefit plan, before tax	20	20	62	62
Total adjustments related to defined benefit plan, tax	6	5	18	(59)
Total adjustments related to defined benefit plan	14	15	44	121
Net unrealized losses from cash flow hedges:
Unrealized holding losses on cash flow hedges arising during the period, before tax	220	(177)	(1,530)	(1,169)
Unrealized holding losses on cash flow hedges arising during the period, tax	63	(51)	(442)	(326)
Unrealized holding losses on cash flow hedges arising during the period, net of tax	157	(126)	(1,088)	(843)
Total unrealized losses on cash flow hedges, before tax	220	(177)	(1,530)	(1,169)
Total unrealized losses on cash flow hedges, tax	63	(51)	(442)	(326)
Total unrealized losses on cash flow hedges, net of tax	157	(126)	(1,088)	(843)
Total other comprehensive (loss) income, before tax	(724)	(22)	(2,010)	17
Total other comprehensive (loss) income, tax	(209)	(7)	(583)	(72)
Total other comprehensive (loss) income, net	(515)	(15)	(1,427)	89
Total comprehensive income, before tax	6,902	7,613	19,241	22,392
Total comprehensive income, tax	1,657	1,669	4,369	4,770
Total comprehensive income	$ 5,245	$ 5,944	$ 14,872	$ 17,622