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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 Contract | Jun. 30, 2012 Contract | Jun. 30, 2013 Contract | Jun. 30, 2012 Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 16 | 6 | 32 | 8
Extend Maturity | $ 373 | $ 1,270 | $ 806 | $ 1,270
Modify Rate | 123 | 18 | 604 | 115
Modify Payments | 772 | 6,112 | 1,302 | 6,112
Total Pre-Modification Outstanding Recorded Investment | 1,268 | 7,400 | 2,712 | 7,497
Post- Modification Outstanding Recorded Investment | 1,241 | 7,391 | 2,539 | 7,442
Financing Receivable Specific Reserve |  |  |  | 2,760
Specific Reserve | 662000 | 2760000 | 662000 |
Recorded Investment |  |  | 18 | 0
Number of Contracts |  |  | 4 | 0
Commercial Loan [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 1 | 4 | 3 | 4
Extend Maturity | 100 | 447 | 526 | 447
Modify Rate | 0 | 18 | 0 | 18
Modify Payments | 0 | 6,029 | 12 | 6,029
Total Pre-Modification Outstanding Recorded Investment | 100 | 6,494 | 538 | 6,494
Post- Modification Outstanding Recorded Investment | 100 | 6,494 | 472 | 6,494
Financing Receivable Specific Reserve |  |  |  | 2,760
Specific Reserve | 100 | 2760 | 100 |
Construction Loans [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts |  | 1 |  | 1
Extend Maturity |  | 823 |  | 823
Modify Rate |  | 0 |  | 0
Modify Payments |  | 0 |  | 0
Total Pre-Modification Outstanding Recorded Investment |  | 823 |  | 823
Post- Modification Outstanding Recorded Investment |  | 815 |  | 815
Financing Receivable Specific Reserve |  |  |  | 0
Specific Reserve |  | 0 |  |
Residential Portfolio Segment [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 13 | 1 | 22 | 3
Extend Maturity | 273 | 0 | 280 | 0
Modify Rate | 113 | 0 | 326 | 97
Modify Payments | 769 | 83 | 1,284 | 83
Total Pre-Modification Outstanding Recorded Investment | 1,155 | 83 | 1,890 | 180
Post- Modification Outstanding Recorded Investment | 1,132 | 82 | 1,801 | 133
Financing Receivable Specific Reserve |  |  |  | 0
Specific Reserve | 562 | 0 | 562 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts |  |  | 1 |
Extend Maturity |  |  | 0 |
Modify Rate |  |  | 244 |
Modify Payments |  |  | 0 |
Total Pre-Modification Outstanding Recorded Investment |  |  | 244 |
Post- Modification Outstanding Recorded Investment |  |  | 237 |
Specific Reserve |  |  | 0 |
Consumer Loan [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 2 |  | 6 |
Extend Maturity | 0 |  | 0 |
Modify Rate | 10 |  | 34 |
Modify Payments | 3 |  | 6 |
Total Pre-Modification Outstanding Recorded Investment | 13 |  | 40 |
Post- Modification Outstanding Recorded Investment | 9 |  | 29 |
Specific Reserve | 0 |  | 0 |
Residential Portfolio Segment [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modification, Subsequent Default, Number of Contracts |  |  | 1 |
Recorded Investment |  |  | 9 | 0
Number of Contracts |  |  |  | 0
Consumer Loan [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Financing Receivable, Modification, Subsequent Default, Number of Contracts | 2 |  | 3 |
Recorded Investment | $ 5 | $ 0 | $ 9 | $ 0
Number of Contracts |  | 0 |  | 0

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