Revenue Recognition - Disaggregation of Noninterest Income (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	$ 16,232	$ 15,390
Noninterest Income (out-of-scope of ASC 606)	1,598	1,850
Total Noninterest Income	17,830	17,240
Commissions and Fees
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	6,878	6,741
Installment Billing
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	(71)	0
Refund of Commissions
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	(23)	0
Contract Liabilities/Deferred Revenue
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	0	(273)
Contingent commissions
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	610	650
Subtotal Insurance Revenues
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	7,394	7,118
Trust and Asset Management
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	2,814	2,444
Mutual Fund & Investment Income
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	1,432	1,347
Subtotal Investment Service Income
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	4,246	3,791
Service Charges on Deposit Accounts
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	2,132	2,167
Card Services Income
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	2,146	2,009
Other
Disaggregation of Revenue [Line Items]
Noninterest Income (in-scope of ASC 606)	$ 314	$ 305

Noninterest Income, Other Operating Income, Not In Scope For Topic 606

No definition available.

Name:	tmp_NoninterestIncomeOtherOperatingIncomeNotInScopeForTopic606
Namespace Prefix:	tmp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

+ Details

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

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_CommissionsandFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_InstallmentBillingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_RefundOfCommissionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_ContractLiabilitiesandDeferredRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_ContingentConsiderationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_TotalInsuranceRevenuesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_TrustAndAssetManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_MutualFundAndInvestmentIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_SubtotalInvestmentServiceIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_ServiceChargesOnDepositAccountsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_CardServicesIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=tmp_OtherNonInterestIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: