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Troubled Debt Restructurings, by Type of Loan Modification (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment $ 5,207 $ 2,061
Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 227
Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 1,457 25
Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 263 475
Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 3,487 1,334
Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 3,240 110
Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 1,097
Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 74
Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 247 53
Rate Modification
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate Modification | Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term Modification
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 5,207 1,097
Term Modification | Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 263 109
Term Modification | Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 1,457 25
Term Modification | Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term Modification | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 3,487 963
Term Modification | Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 3,240 110
Term Modification | Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 779
Term Modification | Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 74
Term Modification | Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 247 0
Interest-Only Modification
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Interest-Only Modification | Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Term Modification
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 964
Rate & Term Modification | Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 118
Rate & Term Modification | Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Term Modification | Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 475
Rate & Term Modification | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 371
Rate & Term Modification | Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Term Modification | Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 318
Rate & Term Modification | Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Term Modification | Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 53
Rate & Interest-Only Modification
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate & Interest-Only Modification | Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Term & Interest-Only Modification | Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Consumer Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Commercial and Industrial
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Small Business Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Real Estate Loans
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Real Estate Loans | 1-4 Family - closed end
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Real Estate Loans | Commercial real estate - non-owner occupied
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment 0 0
Rate, Term & Interest-Only Modification | Real Estate Loans | Other construction/Land
    
Financing Receivable, Modifications [Line Items]    
Post-Modification Outstanding, Recorded Investment $ 0 $ 0