Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
INTEREST INCOME:
Interest and fees on loans	$ 136,684	$ 121,512	$ 102,172
Interest on investment securities:
Taxable	28,402us-gaap_InterestIncomeSecuritiesTaxable	25,505us-gaap_InterestIncomeSecuritiesTaxable	31,318us-gaap_InterestIncomeSecuritiesTaxable
Exempt from federal income tax	33,081	28,843	25,552
Interest on federal funds sold and interest-bearing deposits in banks	372	509	754
Total interest income	198,539	176,369	159,796
INTEREST EXPENSE:
Interest on deposits	3,883us-gaap_InterestExpenseDeposits	3,709us-gaap_InterestExpenseDeposits	4,877us-gaap_InterestExpenseDeposits
Other	298us-gaap_InterestExpenseOther	379us-gaap_InterestExpenseOther	235us-gaap_InterestExpenseOther
Total interest expense	4,181us-gaap_InterestExpense	4,088us-gaap_InterestExpense	5,112us-gaap_InterestExpense
Net interest income	194,358us-gaap_InterestIncomeExpenseNet	172,281us-gaap_InterestIncomeExpenseNet	154,684us-gaap_InterestIncomeExpenseNet
PROVISION FOR LOAN LOSSES	4,465us-gaap_ProvisionForLoanLossesExpensed	3,753us-gaap_ProvisionForLoanLossesExpensed	3,484us-gaap_ProvisionForLoanLossesExpensed
Net interest income after provision for loan losses	189,893	168,528	151,200
NONINTEREST INCOME:
Trust fees	18,766	16,317	14,464
Service charges on deposit accounts	16,910	17,546	16,693
ATM, interchange and credit card fees	19,427ffin_AtmInterchangeAndCreditCardFees	16,750ffin_AtmInterchangeAndCreditCardFees	15,187ffin_AtmInterchangeAndCreditCardFees
Real estate mortgage operations	5,639	6,349	5,094
Net gain (loss) on sale of available-for-sale securities (includes ($4), $147 and $2,772 for the years ended December 31, 2014, 2013 and 2012, respectively, related to accumulated comprehensive earnings reclassifications)	(4)us-gaap_GainLossOnSaleOfSecuritiesNet	147us-gaap_GainLossOnSaleOfSecuritiesNet	2,772us-gaap_GainLossOnSaleOfSecuritiesNet
Net gain (loss) on sale of foreclosed assets	904	(152)	(350)
Other	4,982us-gaap_NoninterestIncomeOther	5,095us-gaap_NoninterestIncomeOther	3,349us-gaap_NoninterestIncomeOther
Total noninterest income	66,624us-gaap_NoninterestIncome	62,052us-gaap_NoninterestIncome	57,209us-gaap_NoninterestIncome
NONINTEREST EXPENSE:
Salaries and employee benefits	70,456us-gaap_LaborAndRelatedExpense	66,529us-gaap_LaborAndRelatedExpense	58,269us-gaap_LaborAndRelatedExpense
Loss from partial settlement of pension plan	2,909
Net occupancy expense	9,100us-gaap_OccupancyNet	8,095us-gaap_OccupancyNet	7,076us-gaap_OccupancyNet
Equipment expense	10,740us-gaap_EquipmentExpense	9,673us-gaap_EquipmentExpense	8,790us-gaap_EquipmentExpense
FDIC insurance premiums	2,725	2,418	2,220
ATM, interchange and credit card expenses	6,870	5,660	5,448
Professional and service fees	4,295us-gaap_ProfessionalFees	4,143us-gaap_ProfessionalFees	3,044us-gaap_ProfessionalFees
Printing, stationery and supplies	2,637ffin_PrintingStationeryAndSupplies	2,066ffin_PrintingStationeryAndSupplies	1,970ffin_PrintingStationeryAndSupplies
Amortization of intangible assets	275us-gaap_AmortizationOfIntangibleAssets	197us-gaap_AmortizationOfIntangibleAssets	149us-gaap_AmortizationOfIntangibleAssets
Other	27,918us-gaap_OtherNoninterestExpense	27,231us-gaap_OtherNoninterestExpense	22,083us-gaap_OtherNoninterestExpense
Total noninterest expense	137,925us-gaap_NoninterestExpense	126,012us-gaap_NoninterestExpense	109,049us-gaap_NoninterestExpense
EARNINGS BEFORE INCOME TAXES	118,592	104,568	99,360
INCOME TAX EXPENSE (includes ($1), $51 and $970 for the years ended December 31, 2014, 2013 and 2012, respectively, related to income tax expense from reclassification items)	29,033us-gaap_IncomeTaxExpenseBenefit	25,700us-gaap_IncomeTaxExpenseBenefit	25,135us-gaap_IncomeTaxExpenseBenefit
NET EARNINGS	$ 89,559us-gaap_NetIncomeLoss	$ 78,868us-gaap_NetIncomeLoss	$ 74,225us-gaap_NetIncomeLoss
NET EARNINGS PER SHARE, BASIC	$ 1.40us-gaap_EarningsPerShareBasic	$ 1.24us-gaap_EarningsPerShareBasic	$ 1.18us-gaap_EarningsPerShareBasic
NET EARNINGS PER SHARE, ASSUMING DILUTION	$ 1.39us-gaap_EarningsPerShareDiluted	$ 1.24us-gaap_EarningsPerShareDiluted	$ 1.18us-gaap_EarningsPerShareDiluted

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Net gain (loss) on the sale of foreclosed real estate and other assets.

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Expense related to printed materials, brochures, forms, customer checks and general office supplies.

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Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Aggregate amount of interest expense on all deposits.

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