Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Acronyms, Abbreviations and Capitalized Terms

AFS:	Available-for-sale	ICS:	Insured Cash Sweeps of the Promontory Interfinancial Network
ALCO:	Asset Liability Management Committee	IRS:	Internal Revenue Service
ALL:	Allowance for loan losses	MBS:	Mortgage-backed security
ASC:	Accounting Standards Codification	MPF:	Mortgage Partnership Finance Program
ASU:	Accounting Standards Update	MSRs:	Mortgage Servicing rights
BHCA:	Bank Holding Company Act of 1956	NASDAQ:	NASDAQ Global Security Market
Board:	Board of Directors	OAO:	Other assets owned
bp or bps:	Basis point(s)	OCI:	Other comprehensive income (loss)
Branch Acquisition:	The acquisition of three New Hampshire branches in May 2011	OFAC:	U.S. Office of Foreign Assets Control
CARES Act:	Coronavirus Aid, Relief and Economic Security Act	OREO:	Other real estate owned
CDARS:	Certificate of Deposit Accounts Registry Service of the Promontory Interfinancial Network	OTTI:	Other-than-temporary impairment
CFPB:	Consumer Financial Protection Bureau	OTT:	Other-than-temporary
COLI:	Company-Owned Life Insurance	PPP:	Paycheck Protection Program
Company:	Union Bankshares, Inc. and Subsidiary	PPPLF:	PPP Liquidity Facility of the FRB
COVID-19:	Novel Coronavirus	RD:	USDA Rural Development
DFR:	Vermont Department of Financial Regulation	RSU:	Restricted Stock Unit
Dodd-Frank Act:	The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010	SBA:	U.S. Small Business Administration
DRIP:	Dividend Reinvestment and Stock Purchase Plan	SEC:	U.S. Securities and Exchange Commission
EPS:	Earnings per share	SOX Act:	Sarbanes Oxley Act of 2002
FASB:	Financial Accounting Standards Board	Tax Act:	Tax Cut and Jobs Act
FDIC:	Federal Deposit Insurance Corporation	TDR:	Troubled-debt restructuring
FDICIA:	The Federal Deposit Insurance Corporation Improvement Act of 1991	Union:	Union Bank, the sole subsidiary of Union Bankshares, Inc
FHA:	U.S. Federal Housing Administration	USDA:	U.S. Department of Agriculture
FHLB:	Federal Home Loan Bank of Boston	VA:	U.S. Veterans Administration
FRB:	Federal Reserve Board	WHO:	World Health Organization
Fannie Mae:	Federal National Mortgage Association	2008 Plan:	2008 Amended and Restated Nonqualified Deferred Compensation Plan
FHLMC/Freddie Mac:	Federal Home Loan Mortgage Corporation	2008 ISO Plan:	2008 Incentive Stock Option Plan of the Company
GAAP:	Generally accepted accounting principles in the United States	2014 Equity Plan:	2014 Equity Incentive Plan
GLBA:	Gramm-Leach-Bliley Financial Modernization Act of 1999	2017 Tax Act:	Tax Cuts and Jobs Act of 2017
HTM:	Held-to-maturity	2020 Plan:	2020 Amended and Restated Nonqualified Excess Plan
HUD:	U.S. Department of Housing and Urban Development