Reclassification of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Supplemental Comprehensive Income Disclosures [Abstract]
Unrealized holding gains on securities arising during the period	$ (4,025)	$ (3,256)	$ (18,122)	$ 22,069
Reclassification adjustment for gains on securities included in net income	0	(20)	(16)	(47)
Total unrealized gains on securities	(4,025)	(3,276)	(18,138)	22,022
Unrealized holding (losses) gains on derivatives arising during the period	(529)	225	776	(4,892)
Unrealized holding gains on securities arising during the period	844	684	3,805	(4,635)
Reclassification adjustment for gains on derivatives included in net income, before Tax	0	0	0	0
Total unrealized gain on derivatives	(529)	225	776	(4,892)
Reclassification adjustment for gains on securities included in net income	0	4	3	10
Total other comprehensive (loss) income	(4,554)	(3,051)	(17,362)	17,130
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	844	688	3,808	(4,625)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	111	(48)	(163)	1,027
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	111	(48)	(163)	1,027
Other Comprehensive Income (Loss), Tax	955	640	3,645	(3,598)
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Total unrealized (losses) gains on securities	(3,181)	(2,588)	(14,330)	17,397
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(418)	177	613	(3,865)
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	(418)	177	613	(3,865)
Total other comprehensive (loss) income	(3,599)	(2,411)	(13,717)	13,532
Reclassification adjustment for gains on securities included in net income	0	16	13	37
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,516		3,516		$ 17,233
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(418)	177	613	(3,865)
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	(529)	225	776	(4,892)
Other comprehensive income (loss)	(3,599)	(2,411)	(13,717)	13,532
Unrealized holding (losses) gains on securities arising during the period	(4,025)	(3,256)	(18,122)	22,069
Unrealized holding gains on securities arising during the period	844	684	3,805	(4,635)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	20	16	47
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	(4)	(3)	(10)
Reclassification adjustment for gains on securities included in net income	0	16	13	37
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	(4,025)	(3,276)	(18,138)	22,022
Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax	844	688	3,808	(4,625)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(3,181)	(2,588)	(14,330)	17,397
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(529)	225	776	(4,892)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	111	(48)	(163)	1,027
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0	0	0	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0	0	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	111	(48)	(163)	1,027
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(418)	177	613	(3,865)
Other Comprehensive Income (Loss), before Tax	(4,554)	(3,051)	(17,362)	17,130
Other Comprehensive Income (Loss), Tax	955	640	3,645	(3,598)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Total other comprehensive (loss) income	(3,181)	(2,588)	(14,330)	17,397
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	5,980	21,977	5,980	21,977	20,310	$ 4,580
Other comprehensive income (loss) before reclassification adjustment	(3,181)	(2,572)	(14,317)	17,434
Amounts reclassified from accumulated other comprehensive income (loss)	0	(16)	(13)	(37)
Other comprehensive income (loss)	(3,181)	(2,588)	(14,330)	17,397
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 (Loss), Net of Tax	(182)	365	(182)	365	(182)	365
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	(418)	177	613	(3,865)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2,282)	(3,231)	(2,282)	(3,231)	(2,895)	634
Other comprehensive income (loss)	(418)	177	613	(3,865)
Accumulated Other Comprehensive Income (Loss), net [Member]
Supplemental Comprehensive Income Disclosures [Abstract]
Total other comprehensive (loss) income	(3,599)	(2,411)	(13,717)	13,532
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	3,516	19,111	3,516	19,111	$ 17,233	$ 5,579
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(3,599)	(2,395)	(13,704)	13,569
Amounts reclassified from accumulated other comprehensive income (loss)	0	(16)	(13)	(37)
Other comprehensive income (loss)	$ (3,599)	$ (2,411)	$ (13,717)	$ 13,532