Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2015

Banking and Thrift [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

Arrow’s and its subsidiary banks’, Glens Falls National Bank and Trust Company (“Glens Falls National”) and Saratoga National Bank and Trust Company (“Saratoga National”), actual capital amounts and ratios are presented in the table below as of December 31, 2016 and 2015:

	Actual				Minimum Amounts For Capital Adequacy Purposes				Minimum Amounts To Be Well-Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
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	%
As of December 31, 2015
Total Capital  (to Risk Weighted Assets):
Arrow	239,988		15.1	%	127,146		8.0	%	158,932		10.0	%
Glens Falls National	193,302		15.0	%	103,094		8.0	%	128,868		10.0	%
Saratoga National	37,658		12.6	%	23,910		8.0	%	29,887		10.0	%
Tier I Capital  (to Risk Weighted Assets):
Arrow	223,899		14.1	%	95,276		6.0	%	127,035		8.0	%
Glens Falls National	180,280		14.0	%	77,263		6.0	%	103,017		8.0	%
Saratoga National	34,642		11.6	%	17,918		6.0	%	23,891		8.0	%
Tier I Capital  (to Average Assets):
Arrow	223,899		9.3	%	96,301		4.0	%	120,376		5.0	%
Glens Falls National	180,280		8.9	%	81,025		4.0	%	101,281		5.0	%
Saratoga National	34,642		8.9	%	15,569		4.0	%	19,462		5.0	%
Common Equity Tier 1 Capital  (to Risk Weighted Assets):
Arrow	203,848		12.8	%	71,665		4.5	%	103,517		6.5	%
Glens Falls National	180,229		14.0	%	57,931		4.5	%	83,678		6.5	%
Saratoga National	34,642		11.6	%	13,439		4.5	%	19,411		6.5	%