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Acquisitions and FDIC Indemnification Asset (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
FDIC Indemnification Asset [Roll Forward]
Beginning balance	$ 754		$ 1,055	$ 2,632	$ 2,632
Accretion	0	14	0	32	0
Net changes in losses and expenses	(189)		(359)		(1,225)
Reimbursements from the FDIC	(145)		(276)		(352)
TOTAL	$ 420		$ 420		$ 1,055

X

- Definition

FDIC Indemnification Asset, Net Increase (Decrease) in Estimated Losses

+ References

No definition available.

+ Details

Name:	thff_FDICIndemnificationAssetNetIncreaseDecreaseinEstimatedLosses
Namespace Prefix:	thff_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

+ References

No definition available.

+ Details

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

X

- Definition

Increases to the indemnification asset due to accretion of the loan discount relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

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No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAssetAccretionOfDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

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No definition available.

+ Details

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

X

- Details

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