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Parent Company Only, Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Expenses [Abstract]      
Professional services $ 6,245 $ 5,577 $ 6,108
Total noninterest expense 111,297 100,319 101,662
Income before income taxes 77,613 99,417 82,133
Income tax benefit 18,967 24,183 20,614
Net income 58,646 75,234 61,519
Change in other comprehensive income 13,957 (39,341) 211
Comprehensive income 72,603 35,893 61,730
TrustCo Bank Corp NY [Member]      
Statements of Comprehensive Income [Abstract]      
Dividends and interest from subsidiaries 34,220 34,125 34,096
Net gain on securities transactions 0 0 0
Miscellaneous income 0 0 0
Total income 34,220 34,125 34,096
Expenses [Abstract]      
Operating supplies 0 0 21
Professional services 972 585 819
Miscellaneous expense 1,371 1,752 3,419
Total noninterest expense 2,343 2,337 4,259
Income before income taxes 31,877 31,788 29,837
Income tax benefit (530) (559) (972)
Income before subsidiaries' undistributed earnings 32,407 32,347 30,809
Equity in undistributed earnings of subsidiaries 26,239 42,887 30,710
Net income 58,646 75,234 61,519
Change in other comprehensive income 13,957 (39,341) 211
Comprehensive income $ 72,603 $ 35,893 $ 61,730