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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 Contract | Sep. 30, 2013 Contract | Sep. 30, 2014 Contract | Sep. 30, 2013 Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 27 | 25 | 60 | 57
Extend Maturity | $ 0 | $ 3,277 | $ 1,505 | $ 4,083
Modify Rate | 172 | 60 | 549 | 664
Modify Payments | 1,131 | 1,934 | 1,817 | 3,236
Total Pre-Modification Outstanding Recorded Investment | 1,303 | 5,271 | 3,871 | 7,983
Post- Modification Outstanding Recorded Investment | 1,253 | 3,272 | 3,846 | 5,532
Financing Receivable Specific Reserve |  |  |  | 1,534
Specific Reserve | 2000 | 1260000 | 49000 |
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts |  | 4 | 2 | 7
Extend Maturity |  | 2,442 | 1,505 | 2,969
Modify Rate |  | 0 | 0 | 0
Modify Payments |  | 93 | 0 | 105
Total Pre-Modification Outstanding Recorded Investment |  | 2,535 | 1,505 | 3,074
Post- Modification Outstanding Recorded Investment |  | 601 | 1,648 | 1,041
Financing Receivable Specific Reserve |  |  |  | 198
Specific Reserve |  | 198 | 27 |
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 24 | 10 | 44 | 32
Extend Maturity | 0 | 67 | 0 | 347
Modify Rate | 164 | 24 | 468 | 350
Modify Payments | 1,116 | 269 | 1,767 | 1,552
Total Pre-Modification Outstanding Recorded Investment | 1,280 | 360 | 2,235 | 2,249
Post- Modification Outstanding Recorded Investment | 1,233 | 361 | 2,091 | 1,924
Financing Receivable Specific Reserve |  |  |  | 274
Specific Reserve | 2 | 0 | 22 |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts |  | 5 | 1 | 6
Extend Maturity |  | 758 | 0 | 758
Modify Rate |  | 0 | 0 | 244
Modify Payments |  | 1,551 | 8 | 1,551
Total Pre-Modification Outstanding Recorded Investment |  | 2,309 | 8 | 2,553
Post- Modification Outstanding Recorded Investment |  | 2,252 | 6 | 2,484
Specific Reserve |  | 1062 | 0 | 1062
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | 3 | 6 | 13 | 12
Extend Maturity | 0 | 10 | 0 | 9
Modify Rate | 8 | 36 | 81 | 70
Modify Payments | 15 | 21 | 42 | 28
Total Pre-Modification Outstanding Recorded Investment | 23 | 67 | 123 | 107
Post- Modification Outstanding Recorded Investment | 20 | 58 | 101 | 83
Financing Receivable Specific Reserve |  |  |  | $ 0
Specific Reserve | 0 | 0 | 0 |

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- Definition Description of how troubled debt restructurings that occurred during the period are factored into the determination of the allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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