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Consolidated Statements of Shareholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash dividend per share $ 0.55us-gaap_CommonStockDividendsPerShareDeclared $ 0.52us-gaap_CommonStockDividendsPerShareDeclared $ 0.50us-gaap_CommonStockDividendsPerShareDeclared
Percentage of stock dividend 100.00%ffin_PercentageOfStockDividend    
Common Stock [Member]      
Percentage of stock dividend 100.00%ffin_PercentageOfStockDividend
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
Retained Earnings [Member]      
Cash dividend per share $ 0.55us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 0.52us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 0.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Percentage of stock dividend 100.00%ffin_PercentageOfStockDividend
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember