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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Issuance of shares of common stock pursuant to various stock compensation plans and agreements, shares 655,301us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross 323,737us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross 336,031us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
Issuance of shares pursuant to Director retainer fee, shares 18,909us-gaap_StockIssuedDuringPeriodSharesIssuedForServices 19,998us-gaap_StockIssuedDuringPeriodSharesIssuedForServices 26,151us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Cancellation of common stock due to forfeitures of issued restricted stock, shares 20,017us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited 65,686us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited 190,634us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
Restricted stock surrendered due to employee tax liability, shares 285,953us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 508,518us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 137,258us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Purchase of treasury stock pursuant to the Stock Repurchase Program, shares   8,026,807us-gaap_TreasuryStockSharesAcquired 9,068,105us-gaap_TreasuryStockSharesAcquired
Issuance of shares pursuant to MetroCorp acquisition, shares 5,583,093us-gaap_StockIssuedDuringPeriodSharesAcquisitions    
Common stock issued on conversion of convertible preferred stock   5,594,080us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities  
Series A Preferred Stock      
Conversion of Series A preferred stock, shares   85,710us-gaap_StockRedeemedOrCalledDuringPeriodShares
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