Document and Entity Information
Document and Entity Information - USD ($) $ in Millions | Dec. 31, 2019 | Feb. 24, 2020 | Jun. 28, 2019 |
Cover [Abstract] | |||
Document Type | 10-K/A | ||
Amendment Flag | true | ||
Amendment Description | TrustCo Bank Corp NY (the “Company”), is filing this Amendment No. 1 (“Amendment No. 1”) to its Annual Report on Form 10-K for the year ended December 31, 2019 (the “Original Filing”) for the sole purpose of filing Exhibit 4.1, which was inadvertently omitted from the Original Filing. | ||
Document Period End Date | Dec. 31, 2019 | ||
Current Fiscal Year End Date | --12-31 | ||
Document Transition Report | false | ||
Entity Registrant Name | TRUSTCO BANK CORP N Y | ||
Entity Incorporation, State or Country Code | NY | ||
Entity File Number | 000-10592 | ||
Entity Tax Identification Number | 14-1630287 | ||
Entity Address, Address Line One | 5 SARNOWSKI DRIVE | ||
Entity Address, City or Town | GLENVILLE | ||
Entity Address, State or Province | NY | ||
Entity Address, Postal Zip Code | 12302 | ||
City Area Code | 518 | ||
Local Phone Number | 377-3311 | ||
Entity Well-known Seasoned Issuer | Yes | ||
Entity Voluntary Filers | No | ||
Entity Filer Category | Large Accelerated Filer | ||
Entity Current Reporting Status | Yes | ||
Entity Interactive Data Current | Yes | ||
Entity Emerging Growth Company | false | ||
Entity Shell Company | false | ||
Entity Small Business | false | ||
Entity Public Float | $ 749 | ||
Entity Common Stock, Shares Outstanding | 96,801,657 | ||
Document Fiscal Year Focus | 2019 | ||
Document Fiscal Period Focus | FY | ||
Entity Central Index Key | 0000357301 | ||
Document Annual Report | true | ||
Title of 12(b) Security | Common Stock, $1.00 Par Value | ||
Trading Symbol | TRST | ||
Security Exchange Name | NASDAQ |