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Parent Company Financial Information, Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets [Abstract]        
Equity securities, at estimated fair value $ 33,550 $ 30,737    
Other assets 266,733 293,957    
Total assets 12,012,111 10,932,906    
Liabilities and Stockholders' Equity [Abstract]        
Total liabilities 10,761,658 9,745,288    
Stockholders' equity 1,250,453 1,187,618 $ 1,120,397 $ 1,017,909
Total liabilities and stockholders' equity 12,012,111 10,932,906    
NBT Bancorp Inc [Member]        
Assets [Abstract]        
Cash and cash equivalents 77,182 37,915 $ 9,387 $ 5,876
Equity securities, at estimated fair value 27,622 25,111    
Investment in subsidiaries, on equity basis 1,359,613 1,345,317    
Other assets 36,216 30,577    
Total assets 1,500,633 1,438,920    
Liabilities and Stockholders' Equity [Abstract]        
Total liabilities 250,180 251,302    
Stockholders' equity 1,250,453 1,187,618    
Total liabilities and stockholders' equity $ 1,500,633 $ 1,438,920