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Loans and Allowance for Loan Losses - Schedule of Impaired Loans and Related Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Unpaid Contractual Principal Balance $ 25,644us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance $ 32,463us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance $ 26,941us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Recorded Investment With No Allowance 5,298ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance 6,154ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance 5,566ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
Recorded Investment With Allowance 13,637ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance 18,556ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance 14,628ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
Total Recorded Investment 18,935us-gaap_ImpairedFinancingReceivableRecordedInvestment 24,710us-gaap_ImpairedFinancingReceivableRecordedInvestment 20,194us-gaap_ImpairedFinancingReceivableRecordedInvestment
Related Allowance 3,860us-gaap_ImpairedFinancingReceivableRelatedAllowance 5,283us-gaap_ImpairedFinancingReceivableRelatedAllowance 4,213us-gaap_ImpairedFinancingReceivableRelatedAllowance
Average Recorded Investment 20,263us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 26,770us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 24,497us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Agriculture [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Unpaid Contractual Principal Balance 213us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 123us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 177us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember
Recorded Investment With No Allowance   15ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		  
Recorded Investment With Allowance 197ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 94ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 165ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember
Total Recorded Investment 197us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 109us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 165us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember
Related Allowance 55us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 36us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 57us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember
Average Recorded Investment 207us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 111us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember		 179us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ffin_AgriculturalMember
Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Unpaid Contractual Principal Balance 20,865us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 28,028us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 22,177us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
Recorded Investment With No Allowance 4,519ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 5,387ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 4,859ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
Recorded Investment With Allowance 10,464ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 15,534ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 11,359ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
Total Recorded Investment 14,983us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 20,921us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 16,218us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
Related Allowance 2,617us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 3,865us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 2,867us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
Average Recorded Investment 16,179us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 22,764us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember		 19,837us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
Commercial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Unpaid Contractual Principal Balance 3,696us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 3,250us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 3,749us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Recorded Investment With No Allowance 373ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 258ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 287ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Recorded Investment With Allowance 2,725ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 2,551ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 2,906ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Total Recorded Investment 3,098us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 2,809us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 3,193us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Related Allowance 1,079us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 1,200us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 1,171us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Average Recorded Investment 3,200us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 2,956us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember		 3,698us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Unpaid Contractual Principal Balance 870us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 1,062us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 838us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Recorded Investment With No Allowance 406ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 494ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 420ffin_ImpairedFinancingReceivableRecordedInvestmentWithNoAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Recorded Investment With Allowance 251ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 377ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 198ffin_ImpairedFinancingReceivableRecordedInvestmentWithAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Total Recorded Investment 657us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 871us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 618us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Related Allowance 109us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 182us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 118us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Average Recorded Investment $ 677us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 $ 939us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember		 $ 783us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember