Other Comprehensive Income (Loss) - Activity in AOCI, net of tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 426,167	$ 399,589	$ 373,286
Other comprehensive income before reclassifications	11,555	6,751	(2,290)
Amounts reclassified from accumulated other comprehensive loss	(1,146)	(8)	(122)
Net other comprehensive income during period	10,409	6,743	(2,412)
Impact of ASC 326 Adoption	2,354		$ 47
Accounting Standards Update Extensible List			us-gaap:AccountingStandardsUpdate201802Member
Balance	982,276	426,167	$ 399,589
Securities Available For Sale [Member]
Balance	4,839	(2,057)	601
Other comprehensive income before reclassifications	11,401	6,915	(2,650)
Amounts reclassified from accumulated other comprehensive loss	(1,157)	(19)	(137)
Net other comprehensive income during period	10,244	6,896	(2,787)
Impact of ASC 326 Adoption			$ 129
Accounting Standards Update Extensible List			us-gaap:AccountingStandardsUpdate201802Member
Balance	15,083	4,839	$ (2,057)
Post Retirement Benefit [Member]
Balance	(244)	(91)	(384)
Other comprehensive income before reclassifications	154	(164)	360
Amounts reclassified from accumulated other comprehensive loss	11	11	15
Net other comprehensive income during period	165	(153)	375
Impact of ASC 326 Adoption			$ (82)
Accounting Standards Update Extensible List			us-gaap:AccountingStandardsUpdate201802Member
Balance	(79)	(244)	$ (91)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	4,595	(2,148)	217
Impact of ASC 326 Adoption			$ 47
Accounting Standards Update Extensible List			us-gaap:AccountingStandardsUpdate201802Member
Balance	$ 15,004	$ 4,595	$ (2,148)