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Deposits - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Time deposits, greater than $250,000	$ 229.7	$ 181.4

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- Definition

The aggregate amount of domestic time deposit liabilities in denominations of $250,000 or more.

+ References

No definition available.

+ Details

Name:	tmp_TimeGreaterThanTwoHundredFiftyThousandDollars
Namespace Prefix:	tmp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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