Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Summary of Commitments And Contingent Liabilities) (Detail)

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COMMITMENTS AND CONTINGENCIES (Summary of Commitments And Contingent Liabilities) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Commitments to extend credit $ 1,156,682sfbs_CommitmentsToExtendCredit $ 1,052,902sfbs_CommitmentsToExtendCredit $ 824,047sfbs_CommitmentsToExtendCredit
Credit card arrangements 45,155sfbs_CreditCardArrangements 38,122sfbs_CreditCardArrangements 25,699sfbs_CreditCardArrangements
Standby letters of credit and financial guarantees 33,280sfbs_StandbyLettersOfCreditAndFinancialGuarantees 40,371sfbs_StandbyLettersOfCreditAndFinancialGuarantees 36,374sfbs_StandbyLettersOfCreditAndFinancialGuarantees
Total $ 1,235,117us-gaap_OtherCommitment $ 1,131,395us-gaap_OtherCommitment $ 886,120us-gaap_OtherCommitment