Reclassification of Accumulated Other Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ (3,256)	$ 3,152	$ 22,069	$ 22,055
Reclassification adjustment for gains on securities included in net income	(20)	(9)	(47)	(15)
Total unrealized gains on securities	(3,276)	3,143	22,022	22,040
Unrealized holding gains (losses) on derivatives arising during the period	225	(124)	(4,892)	9
Unrealized holding gains on securities arising during the period	684	(663)	(4,635)	(4,632)
Reclassification adjustment for gains on derivatives included in net income, before Tax	0	0	0	0
Total unrealized gain on derivatives	225	(124)	(4,892)	9
Reclassification adjustment for gains on securities included in net income	4	2	10	3
Total other comprehensive (loss) income	(3,051)	3,019	17,130	22,049
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	688	(661)	(4,625)	(4,629)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(48)	26	1,027	(2)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total	(48)	26	1,027	(2)
Other Comprehensive Income (Loss), Tax	640	(635)	(3,598)	(4,631)
Other comprehensive income (loss) before reclassification adjustment	(2,572)	2,489	17,434	17,423
Total unrealized (losses) gains on securities	(2,588)	2,482	17,397	17,411
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	177	(98)	(3,865)	7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total	177	(98)	(3,865)	7
Total other comprehensive (loss) income	(2,411)	2,384	13,532	17,418
Reclassification adjustment for gains on securities included in net income	16	7	37	12
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net	19,111		19,111
Other comprehensive income (loss) before reclassification adjustment	(2,572)	2,489	17,434	17,423
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	177	(98)	(3,865)	7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	225	(124)	(4,892)	9
Other comprehensive income (loss)	(2,411)	2,384	13,532	17,418
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Other comprehensive income (loss) before reclassification adjustment	(2,572)	2,489	17,434	17,423
Total other comprehensive (loss) income	(2,588)	2,482	17,397	17,411
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net	21,977	5,714	21,977	5,714
Other comprehensive income (loss) before reclassification adjustment	(2,572)	2,489	17,434	17,423
Amounts reclassified from accumulated other comprehensive income (loss)	(16)	(7)	(37)	(12)
Other comprehensive income (loss)	(2,588)	2,482	17,397	17,411
Accumulated Defined Benefit Plans Adjustment [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Other comprehensive income (loss) before reclassification adjustment	0	0	0	0
Total other comprehensive (loss) income	0	0	0	0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net	365	461	365	461
Other comprehensive income (loss) before reclassification adjustment	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Derivative [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Total other comprehensive (loss) income	177	(98)	(3,865)	7
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net	(3,231)	(98)	(3,231)	(98)
Other comprehensive income (loss)	177	(98)	(3,865)	7
Accumulated Other Comprehensive Income (Loss), net [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Total other comprehensive (loss) income	(2,411)	2,384	13,532	17,418
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income, net	19,111	6,077	19,111	6,077
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,395)	2,391	13,569	17,430
Amounts reclassified from accumulated other comprehensive income (loss)	(16)	(7)	(37)	(12)
Other comprehensive income (loss)	$ (2,411)	$ 2,384	$ 13,532	$ 17,418