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Additional Details Related to Loans Classified as TDR's (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Pre-Modification Outstanding Recorded Investment | $ 199 |  | $ 5,409 |  |
Post-Modification Outstanding Recorded Investment | 199 |  | 5,406 |  | 8,467
Reserve Difference | 37 | [1] | 36 | [1] |
Reserve | 43 |  | 124 |  |
Consumer Loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 2 |  | 7 |  |
Pre-Modification Outstanding Recorded Investment | 20 |  | 284 |  |
Post-Modification Outstanding Recorded Investment | 20 |  | 284 |  | 1,714
Reserve Difference | 2 | [1] | 33 | [1] |
Reserve | 6 |  | 38 |  |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 1 |  | 4 |  |
Pre-Modification Outstanding Recorded Investment | 50 |  | 1,507 |  |
Post-Modification Outstanding Recorded Investment | 50 |  | 1,507 |  | 1,285
Reserve Difference | 18 | [1] | (20) | [1] |
Reserve | 20 |  | 69 |  |
Small Business Loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 0 |  | 0 |  |
Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |  |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |  | 675
Reserve Difference | 0 | [1] | 0 | [1] |
Reserve | 0 |  | 0 |  |
Real Estate Loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Pre-Modification Outstanding Recorded Investment | 129 |  | 3,618 |  |
Post-Modification Outstanding Recorded Investment | 129 |  | 3,615 |  | 4,793
Reserve Difference | 17 | [1] | 23 | [1] |
Reserve | 17 |  | 17 |  |
Real Estate Loans | 1-4 Family - closed end |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 2 |  | 3 |  |
Pre-Modification Outstanding Recorded Investment | 129 |  | 3,369 |  |
Post-Modification Outstanding Recorded Investment | 129 |  | 3,368 |  | 1,351
Reserve Difference | 17 | [1] | 17 | [1] |
Reserve | 17 |  | 17 |  |
Real Estate Loans | Commercial real estate - owner occupied |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 0 |  | 0 |  |
Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |  |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |  | 2,190
Reserve Difference | 0 | [1] | 0 | [1] |
Reserve | 0 |  | 0 |  |
Real Estate Loans | Commercial real estate - non-owner occupied |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 0 |  | 0 |  |
Pre-Modification Outstanding Recorded Investment | 0 |  | 0 |  |
Post-Modification Outstanding Recorded Investment | 0 |  | 0 |  | 390
Reserve Difference | 0 | [1] | 0 | [1] |
Reserve | 0 |  | 0 |  |
Other construction/Land | Real Estate Loans |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 0 |  | 1 |  |
Pre-Modification Outstanding Recorded Investment | 0 |  | 249 |  |
Post-Modification Outstanding Recorded Investment | 0 |  | 247 |  | 833
Reserve Difference | 0 | [1] | 6 | [1] |
Reserve | $ 0 |  | $ 0 |  |
[1] | This represents the change in the ALL 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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