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Parent Company Only, Statements of Cash Flows (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities [Abstract]      
Net income $ 58,646 $ 75,234 $ 61,519
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]      
Stock based compensation expense 103 0 0
Total adjustments 5,483 3,392 (6,154)
Net cash provided by operating activities 64,129 78,626 55,365
Cash flows from investing activities [Abstract]      
Purchases of securities available for sale (19,678) (203,516) (139,962)
Net cash used in investing activities (233,593) (416,626) (175,256)
Cash flows from financing activities [Abstract]      
Cash used to settle fractional shares in the Reverse Stock Split 0 0 (200)
Proceeds from exercise of stock options 0 429 260
Dividends paid (27,388) (26,991) (26,279)
Payments to acquire treasury stock 0 (7,004) (2,386)
Net cash provided by (used in) financing activities 96,869 (230,871) 232,262
Net (decrease) increase in cash and cash equivalents (72,595) (568,871) 112,371
Cash and cash equivalents at beginning of period 650,599 1,219,470 1,107,099
Cash and cash equivalents at end of period 578,004 650,599 1,219,470
TrustCo Bank Corp NY [Member]      
Cash flows from operating activities [Abstract]      
Net income 58,646 75,234 61,519
Adjustments to reconcile net income to net cash provided by operating activities [Abstract]      
Equity in undistributed earnings of subsidiaries (26,239) (42,887) (30,710)
Stock based compensation expense 0 0 0
Net change in other assets and accrued expenses (1,563) (440) 354
Total adjustments (27,802) (43,327) (30,356)
Net cash provided by operating activities 30,844 31,907 31,163
Cash flows from investing activities [Abstract]      
Purchases of securities available for sale 0 0 0
Net cash used in investing activities 0 0 0
Cash flows from financing activities [Abstract]      
Cash used to settle fractional shares in the Reverse Stock Split 0 0 (200)
Proceeds from exercise of stock options 0 429 260
Dividends paid (27,376) (26,978) (26,266)
Payments to acquire treasury stock 0 (7,004) (2,386)
Proceeds from sales of treasury stock 0 0 0
Net cash provided by (used in) financing activities (27,376) (33,553) (28,592)
Net (decrease) increase in cash and cash equivalents 3,468 (1,646) 2,571
Cash and cash equivalents at beginning of period 25,079 26,725 24,154
Cash and cash equivalents at end of period $ 28,547 $ 25,079 $ 26,725