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Parent Company Only, Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Expenses [Abstract]      
Professional services $ 5,577 $ 6,108 $ 5,618
Total noninterest expense 100,319 101,662 95,704
Income before income taxes 99,417 82,133 69,446
Income tax benefit 24,183 20,614 16,994
Net income 75,234 61,519 52,452
Change in other comprehensive (loss) income (39,341) 211 7,475
Comprehensive income 35,893 61,730 59,927
TrustCo Bank Corp NY [Member]      
Statements of Comprehensive Income [Abstract]      
Dividends and interest from subsidiaries 34,125 34,096 31,100
Net gain on securities transactions 0 0 0
Miscellaneous income 0 0 0
Total income 34,125 34,096 31,100
Expenses [Abstract]      
Operating supplies 0 21 20
Professional services 585 819 655
Miscellaneous expense 1,752 3,419 1,666
Total noninterest expense 2,337 4,259 2,341
Income before income taxes 31,788 29,837 28,759
Income tax benefit (559) (972) (558)
Income before subsidiaries' undistributed earnings 32,347 30,809 29,317
Equity in undistributed earnings of subsidiaries 42,887 30,710 23,135
Net income 75,234 61,519 52,452
Change in other comprehensive (loss) income (39,341) 211 7,475
Comprehensive income $ 35,893 $ 61,730 $ 59,927