Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income, before tax amount	$ 6,966	$ 7,260
Income tax expense	1,598	1,520
Net income	5,368	5,740
Debt securities available for sale:
Unrealized holding gains on securities arising during the period, before tax	(166)	313
Unrealized holding gains on securities arising during the period, tax	(35)	73
Unrealized holding gains on securities arising during the period, net	(131)	240
Less: reclassification adjustment for gains on securities included in net income, before tax	(170)	100
Less: reclassification adjustment for gains on securities included in net income, tax	(36)	21
Total reclassification adjustment for gains on securities included in net income	(134)	79
Total unrealized gains on securities available for sale, before tax	4	213
Total unrealized gains on securities available for sale, tax	1	52
Total unrealized gains on securities available for sale, net of tax	3	161
Adjustments related to defined benefit plan:
Amortization of prior service cost, before tax	21	21
Amortization of prior service cost, tax	6	(70)
Amortization of prior service cost, net of tax	15	91
Total adjustments related to defined benefit plan, before tax	21	21
Total adjustments related to defined benefit plan, tax	6	(70)
Total adjustments related to defined benefit plan	15	91
Net unrealized losses from cash flow hedges:
Unrealized holding loss on cash flow hedges arising during the period, before tax	(1,410)	(408)
Unrealized holding loss on cash flow hedges arising during the period, tax	(406)	(106)
Unrealized holding loss on cash flow hedges arising during the period, net of tax	(1,004)	(302)
Total unrealized loss on cash flow hedges, before tax	(1,410)	(408)
Total unrealized loss on cash flow hedges, tax	(406)	(106)
Total unrealized loss on cash flow hedges, net of tax	(1,004)	(302)
Total other comprehensive income, before tax	(1,385)	(174)
Total other comprehensive income, tax	(399)	(124)
Total other comprehensive income, net	(986)	(50)
Total comprehensive income, before tax	5,581	7,086
Total comprehensive income, tax	1,199	1,396
Total comprehensive income	$ 4,382	$ 5,690