Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
NET EARNINGS	$ 23,997us-gaap_NetIncomeLoss	$ 22,336us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	2,473	2,316
PROVISION FOR LOAN LOSSES	1,290us-gaap_ProvisionForLoanLossesExpensed	1,690us-gaap_ProvisionForLoanLossesExpensed
Securities premium amortization (discount accretion), net	6,028	4,652
Gain on sale of assets, net	(40)us-gaap_GainsLossesOnSalesOfAssets	(451)us-gaap_GainsLossesOnSalesOfAssets
Deferred federal income tax benefit	0	0
Change in loans held for sale	(1,428)	(3,174)
Change in other assets	1,083	8,174
Change in other liabilities	7,002	7,842
Total adjustments	16,408	21,049
Net cash provided by operating activities	40,405	43,385
CASH FLOWS FROM INVESTING ACTIVITIES:
Net decrease in interest-bearing time deposits in banks	7,832	1,891
Activity in available-for-sale securities:
Sales	1,129	904
Maturities	46,774	49,491
Purchases	(294,523)	(142,638)
Activity in held-to-maturity securities - maturities	131	102
Net increase in loans	329	(7,150)
Purchases of bank premises and equipment and other assets	(3,087)	(1,909)
Proceeds from sale of other assets	212	839
Net cash used in investing activities	(241,203)	(98,470)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net increase in noninterest-bearing deposits	30,476	27,147
Net increase in interest-bearing deposits	56,275	72,059
Net increase (decrease) in short-term borrowings	34,788	(80,668)
Common stock transactions:
Proceeds from stock issuances	728	714
Dividends paid	(8,972)us-gaap_PaymentsOfDividendsCommonStock	(8,318)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	113,295	10,934
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(87,503)	(44,151)
CASH AND CASH EQUIVALENTS, beginning of period	253,471	212,012
CASH AND CASH EQUIVALENTS, end of period	165,968	167,861
SUPPLEMENTAL INFORMATION AND NONCASH TRANSACTIONS:
Interest paid	971us-gaap_InterestPaid	1,055us-gaap_InterestPaid
Federal income tax paid	0us-gaap_IncomeTaxesPaid	0us-gaap_IncomeTaxesPaid
Transfer of loans to foreclosed assets	97ffin_TransferOfLoansToForeclosedAssets	158ffin_TransferOfLoansToForeclosedAssets
Investment securities purchased but not settled	$ 20,639	$ 3,387

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- Definition

The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Period Type:	duration

- Definition

The net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 230

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6477933&loc=d3e60009-112784

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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- Definition

Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of expense related to loss from loan transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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Balance Type:	debit
Period Type:	duration

- Details

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