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Parent Company Financial Information, Condensed Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Assets [Abstract]        
Equity securities, at estimated fair value $ 42,372 $ 37,591    
Other assets 392,522 395,889    
Total assets 13,786,666 13,309,040 $ 11,739,296  
Liabilities and Stockholders' Equity [Abstract]        
Total liabilities 12,260,525 11,883,349    
Stockholders' equity 1,526,141 1,425,691 1,173,554 $ 1,250,453
Total liabilities and stockholders' equity 13,786,666 13,309,040    
NBT Bancorp Inc [Member]        
Assets [Abstract]        
Cash and cash equivalents 185,451 162,364 $ 116,129 $ 77,182
Equity securities, at estimated fair value 33,922 28,739    
Investment in subsidiaries, on equity basis 1,534,693 1,464,980    
Other assets 49,694 42,435    
Total assets 1,803,760 1,698,518    
Liabilities and Stockholders' Equity [Abstract]        
Total liabilities 277,619 272,827    
Stockholders' equity 1,526,141 1,425,691    
Total liabilities and stockholders' equity $ 1,803,760 $ 1,698,518