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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

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