Loans and Leases - Schedule of Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 6,481,963	$ 6,450,749
Less: unearned income and deferred costs and fees	(4,020)	(4,504)
Total Loans	6,477,943	6,446,245
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,117,801	1,100,648
Commercial and industrial \| Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	104,534	114,475
Total Loans	104,534	114,475
Commercial and industrial \| Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,013,267	986,173
Total Loans	1,013,267	986,173
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	3,681,813	3,662,035
Commercial real estate \| Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	238,165	234,292
Total Loans	238,165	234,292
Commercial real estate \| Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,972,270	2,978,842
Total Loans	2,972,270	2,978,842
Commercial real estate \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	471,378	448,901
Total Loans	471,378	448,901
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,589,029	1,591,186
Residential Real Estate \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	229,927	227,654
Total Loans	229,927	227,654
Residential Real Estate \| Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	1,359,102	1,363,532
Total Loans	1,359,102	1,363,532
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	83,667	86,467
Consumer and other \| Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	83,609	86,399
Consumer and other \| Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	58	68
Total Loans	58	68
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 9,653	$ 10,413

TOMPKINS FINANCIAL CORP 10-Q