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Automated teller machine interchange and credit card fees.

No definition available.

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Interest income derived from overnight sales of short-term funds to other banks and from interest-bearing balances due from depository institutions, including the Federal Reserve Bank of Dallas.

No definition available.

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Interest on loan recoveries.

No definition available.

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

No definition available.

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Operational and other losses.

No definition available.

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

No definition available.

Name:	ffin_PrintingStationeryAndSupplies
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Fees paid to third parties; including consultants, actuaries, mortgage loan processors, escrow tax servicers, consumer loan processing companies, etc.

No definition available.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of expense for amortization of capitalized computer software costs.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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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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-Subparagraph (SX 210.5-03(21))
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-Paragraph 1
-Subparagraph (SX 210.9-04(23))
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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.

No definition available.

Name:	us-gaap_EquipmentExpense
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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.

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

Name:	us-gaap_FeesAndCommissionsMortgageBanking
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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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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.

Name:	us-gaap_GainLossOnSaleOfSecuritiesNet
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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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-Paragraph 1
-Subparagraph (SX 210.7-04(8))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Name:	us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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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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-Name Accounting Standards Codification
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-Subparagraph (a),(b)
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-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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Name:	us-gaap_IncomeTaxExpenseBenefit
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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.

Name:	us-gaap_InterestAndDividendIncomeOperating
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No definition available.

Name:	us-gaap_InterestAndDividendIncomeOperatingAbstract
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No definition available.

Name:	us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract
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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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Amount of the cost of borrowed funds accounted for as interest expense.

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-Publisher FASB
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No definition available.

Name:	us-gaap_InterestExpenseAbstract
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Aggregate amount of interest expense on all deposits.

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Amount of interest expense classified as other.

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Name:	us-gaap_InterestExpenseOther
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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

Name:	us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
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The net amount of operating interest income (expense).

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

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Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax.

Name:	us-gaap_InterestIncomeSecuritiesTaxable
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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Period Type:	duration

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Paragraph 1
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-Subparagraph (SX 210.5-03(20))
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Name:	us-gaap_NetIncomeLoss
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Total aggregate amount of all noninterest expense.

Name:	us-gaap_NoninterestExpense
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Balance Type:	debit
Period Type:	duration

No definition available.

Name:	us-gaap_NoninterestExpenseAbstract
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Balance Type:	na
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The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

Name:	us-gaap_NoninterestIncome
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No definition available.

Name:	us-gaap_NoninterestIncomeAbstract
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Period Type:	duration

Represents the total of noninterest income derived from certain activities and assets including (for example): (1) venture capital investments; (2) bank owned life insurance; (3) foreign currency transactions; and (4) mortgage servicing rights.

Name:	us-gaap_NoninterestIncomeOther
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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Name:	us-gaap_OccupancyNet
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Amount of noninterest expense classified as other.

Name:	us-gaap_OtherNoninterestExpense
Namespace Prefix:	us-gaap_
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Period Type:	duration

Amount of expense related to loss from loan transactions.