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Deposits and Short-Term Borrowings - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Time Deposits [Line Items]
Time deposit threshold amount	$ 250,000ffin_TimeDepositsThresholdAmount
Time deposits of $250,000 or more totaled	211,490,000ffin_TimeDeposits250000OrMore	142,842,000ffin_TimeDeposits250000OrMore
Deposits received from related parties	53,556,000us-gaap_RelatedPartyDepositLiabilities	42,237,000us-gaap_RelatedPartyDepositLiabilities
Advances from Federal Home Loan Bank of Dallas	1,010,000us-gaap_FederalHomeLoanBankAdvances
Short-Term Borrowings [Member]
Time Deposits [Line Items]
Securities sold under agreements to repurchase	357,400,000	267,269,000
Advances from Federal Home Loan Bank of Dallas	$ 1,010,000	$ 191,119,000

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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