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Additional Details Related to Loans Classified as TDR's (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Financing Receivable, Modifications [Line Items] |  |  |  |
Pre-Modification Outstanding Recorded Investment | $ 5,209 |  | $ 1,705 |
Post-Modification Outstanding Recorded Investment | 5,207 |  | 2,061 |
Reserve Difference | (1) | [1] | (82) | [1]
Reserve | 100 |  | 146 |
Consumer Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 0 |  | 4 |
Pre-Modification Outstanding Recorded Investment | 0 |  | 228 |
Post-Modification Outstanding Recorded Investment | 0 |  | 227 |
Reserve Difference | 0 | [1] | (14) | [1]
Reserve | 0 |  | 12 |
Commercial and Industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 3 |  | 2 |
Pre-Modification Outstanding Recorded Investment | 1,457 |  | 25 |
Post-Modification Outstanding Recorded Investment | 1,457 |  | 25 |
Reserve Difference | (38) | [1] | (11) | [1]
Reserve | 57 |  | 2 |
Small Business Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 5 |  | 1 |
Pre-Modification Outstanding Recorded Investment | 263 |  | 468 |
Post-Modification Outstanding Recorded Investment | 263 |  | 475 |
Reserve Difference | 31 | [1] | 2 | [1]
Reserve | 39 |  | 118 |
Real Estate Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Pre-Modification Outstanding Recorded Investment | 3,489 |  | 984 |
Post-Modification Outstanding Recorded Investment | 3,487 |  | 1,334 |
Reserve Difference | 6 | [1] | (59) | [1]
Reserve | 4 |  | 14 |
Real Estate Loans | 1-4 Family - closed end |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 1 |  | 2 |
Pre-Modification Outstanding Recorded Investment | 3,240 |  | 110 |
Post-Modification Outstanding Recorded Investment | 3,240 |  | 110 |
Reserve Difference | 0 | [1] | 6 | [1]
Reserve | 0 |  | 8 |
Real Estate Loans | Commercial real estate - owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 0 |  | 2 |
Pre-Modification Outstanding Recorded Investment | 0 |  | 747 |
Post-Modification Outstanding Recorded Investment | 0 |  | 1,097 |
Reserve Difference | 0 | [1] | (71) | [1]
Reserve | 0 |  | 0 |
Real Estate Loans | Commercial real estate - non-owner occupied |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 0 |  | 1 |
Pre-Modification Outstanding Recorded Investment | 0 |  | 74 |
Post-Modification Outstanding Recorded Investment | 0 |  | 74 |
Reserve Difference | 0 | [1] | 6 | [1]
Reserve | 0 |  | 6 |
Other construction/Land | Real Estate Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 1 |  | 1 |
Pre-Modification Outstanding Recorded Investment | 249 |  | 53 |
Post-Modification Outstanding Recorded Investment | 247 |  | 53 |
Reserve Difference | 6 | [1] | 0 | [1]
Reserve | $ 4 |  | $ 0 |
[1] | This represents the change in the ALLL reserve for these credits measured as the difference between the specific post-modification impairment reserve and the pre-modification reserve calculated under our general allowance for loan loss methodology.

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