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Loans and Allowance for Loan Losses - Loans Held-for-Investment by Class of Financing Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Commercial $ 639,954us-gaap_LoansReceivableCommercialAndIndustrial $ 596,730us-gaap_LoansReceivableCommercialAndIndustrial
Agricultural 105,694us-gaap_LoansReceivableCommercialAgricultural 75,928us-gaap_LoansReceivableCommercialAgricultural
Real estate 1,822,854us-gaap_MortgageLoansOnRealEstate 1,678,514us-gaap_MortgageLoansOnRealEstate
Consumer 360,686ffin_LoansAndLeasesReceivableConsumers 333,113ffin_LoansAndLeasesReceivableConsumers
Total $ 2,929,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 2,684,285us-gaap_LoansAndLeasesReceivableGrossCarryingAmount