Loans and Leases - Nonaccrual Loans (Details) - USD ($)	3 Months Ended
Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	$ 28,512,000	$ 26,127,000
Nonaccrual Loans and Leases	70,891,000	50,548,000
Loans and Leases Past Due Over 89 Days and Accruing	187,000	323,000
Interest on nonaccrual loans	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	622,000	0
Nonaccrual Loans and Leases	2,477,000	1,542,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial and industrial \| Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	13,000	519,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial and industrial \| Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	622,000	0
Nonaccrual Loans and Leases	2,464,000	1,023,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	24,736,000	24,179,000
Nonaccrual Loans and Leases	51,155,000	32,590,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial real estate \| Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	103,000	129,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial real estate \| Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	7,434,000	24,179,000
Nonaccrual Loans and Leases	33,750,000	32,461,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial real estate \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	17,302,000
Nonaccrual Loans and Leases	17,302,000
Loans and Leases Past Due Over 89 Days and Accruing	0
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	3,154,000	1,948,000
Nonaccrual Loans and Leases	17,141,000	16,278,000
Loans and Leases Past Due Over 89 Days and Accruing	1,000	9,000
Residential Real Estate \| Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	232,000	610,000
Nonaccrual Loans and Leases	3,498,000	2,889,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Residential Real Estate \| Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	2,922,000	1,338,000
Nonaccrual Loans and Leases	13,643,000	13,389,000
Loans and Leases Past Due Over 89 Days and Accruing	1,000	9,000
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	118,000	138,000
Loans and Leases Past Due Over 89 Days and Accruing	186,000	314,000
Consumer and other \| Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	114,000	125,000
Loans and Leases Past Due Over 89 Days and Accruing	186,000	314,000
Consumer and other \| Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	4,000	13,000
Loans and Leases Past Due Over 89 Days and Accruing	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualInterestIncome
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualNoAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479294/326-20-55-80

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tmp_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tmp_AgricultureLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tmp_OtherFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=tmp_ConsumerAndOtherPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=tmp_IndirectLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: