Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2021

Regulatory Capital Requirements [Abstract]

Compliance with Regulatory Compliance Requirements Under Banking Regulations

The Company and NBT Bank’s actual capital amounts and ratios are presented as follows:

	Actual					Regulatory Ratio Requirements
(Dollars in thousands)	Amount		Ratio			Minimum Capital Adequacy			Minimum plus Buffer			For Classification as Well- Capitalized
As of December 31, 2021
Tier I Capital (to average assets)
Company	$	1,103,661		9.41	%		4.00	%					5.00	%
NBT Bank		1,087,990		9.32	%		4.00	%					5.00	%
Common Equity Tier 1 Capital
Company		1,006,661		12.25	%		4.50	%		7.00	%		6.50	%
NBT Bank		1,087,990		13.36	%		4.50	%		7.00	%		6.50	%
Tier I Capital (to risk-weighted assets)
Company		1,103,661		13.43	%		6.00	%		8.50	%		8.00	%
NBT Bank		1,087,990		13.36	%		6.00	%		8.50	%		8.00	%
Total Capital (to risk-weighted assets)
Company		1,292,669		15.73	%		8.00	%		10.50	%		10.00	%
NBT Bank		1,176,998		14.45	%		8.00	%		10.50	%		10.00	%
As of December 31, 2020
Tier I Capital (to average assets)
Company	$	1,018,320		9.56	%		4.00	%					5.00	%
NBT Bank		1,054,097		9.95	%		4.00	%					5.00	%
Common Equity Tier 1 Capital
Company		921,320		11.84	%		4.50	%		7.00	%		6.50	%
NBT Bank		1,054,097		13.67	%		4.50	%		7.00	%		6.50	%
Tier I Capital (to risk-weighted assets)
Company		1,018,320		13.09	%		6.00	%		8.50	%		8.00	%
NBT Bank		1,054,097		13.67	%		6.00	%		8.50	%		8.00	%
Total Capital (to risk-weighted assets)
Company		1,215,672		15.62	%		8.00	%		10.50	%		10.00	%
NBT Bank		1,150,544		14.93	%		8.00	%		10.50	%		10.00	%