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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash dividend per share (unaudited) $ 0.14us-gaap_CommonStockDividendsPerShareDeclared $ 0.13us-gaap_CommonStockDividendsPerShareDeclared
Percentage of stock dividend (unaudited)   100.00%ffin_PercentageOfStockDividend
Common Stock [Member]    
Percentage of stock dividend (unaudited)   100.00%ffin_PercentageOfStockDividend
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Retained Earnings [Member]    
Cash dividend per share (unaudited) $ 0.14us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 0.13us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Percentage of stock dividend (unaudited)   100.00%ffin_PercentageOfStockDividend
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember