Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2017

Banking and Thrift [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

The actual capital amounts and ratios for Arrow and its subsidiary banks, Glens Falls National Bank and Trust Company (“Glens Falls National”) and Saratoga National Bank and Trust Company (“Saratoga National”), are presented in the table below as of December 31, 2017 and 2016:

	Actual				Minimum Amounts For Capital Adequacy Purposes				Minimum Amounts To Be Well-Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
As of December 31, 2017
Total Capital  (to Risk Weighted Assets):
Arrow	$	278,163	15.0	%	$	172,461	9.3	%	$	185,442	10.0	%
Glens Falls National	220,275		14.6	%	140,312		9.3	%	150,873		10.0	%
Saratoga National	48,822		14.0	%	32,432		9.3	%	34,873		10.0	%
Tier I Capital  (to Risk Weighted Assets):
Arrow	259,378		14.0	%	135,247		7.3	%	148,216		8.0	%
Glens Falls National	205,200		13.6	%	110,144		7.3	%	120,706		8.0	%
Saratoga National	45,311		13.0	%	25,444		7.3	%	27,884		8.0	%
Tier I Capital  (to Average Assets):
Arrow	259,378		9.5	%	109,212		4.0	%	136,515		5.0	%
Glens Falls National	205,200		9.1	%	90,198		4.0	%	112,747		5.0	%
Saratoga National	45,311		9.4	%	19,281		4.0	%	24,102		5.0	%
Common Equity Tier 1 Capital  (to Risk Weighted Assets):
Arrow	239,326		12.9	%	107,604		5.8	%	120,591		6.5	%
Glens Falls National	205,148		13.6	%	87,490		5.8	%	98,049		6.5	%
Saratoga National	45,311		13.0	%	20,216		5.8	%	22,656		6.5	%
As of December 31, 2016
Total Capital  (to Risk Weighted Assets):
Arrow	258,653		15.2	%	146,343		8.6	%	170,166		10.0	%
Glens Falls National	205,573		15.0	%	117,862		8.6	%	137,049		10.0	%
Saratoga National	42,168		12.8	%	28,332		8.6	%	32,944		10.0	%
Tier I Capital  (to Risk Weighted Assets):
Arrow	241,523		14.1	%	113,053		6.6	%	137,034		8.0	%
Glens Falls National	191,679		14.0	%	90,363		6.6	%	109,531		8.0	%
Saratoga National	39,050		11.9	%	21,658		6.6	%	26,252		8.0	%
Tier I Capital  (to Average Assets):
Arrow	241,523		9.5	%	101,694		4.0	%	127,117		5.0	%
Glens Falls National	191,679		9.1	%	84,255		4.0	%	105,318		5.0	%
Saratoga National	39,050		8.9	%	17,551		4.0	%	21,938		5.0	%
Common Equity Tier 1 Capital  (to Risk Weighted Assets):
Arrow	221,472		13.0	%	86,885		5.1	%	110,736		6.5	%
Glens Falls National	191,628		13.9	%	70,310		5.1	%	89,610		6.5	%
Saratoga National	39,050		11.9	%	16,736		5.1	%	21,330		6.5	%