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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
--- | ---
Mar. 31, 2014 Contract | Mar. 31, 2013 Contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 21 | 16
Extend Maturity | $ 60 | $ 433
Modify Rate | 203 | 481
Modify Payments | 549 | 530
Total Pre-Modification Outstanding Recorded Investment | 812 | 1,444
Post- Modification Outstanding Recorded Investment | 791 | 1,321
Financing Receivable Specific Reserve |  | 0
Specific Reserve | 34000 |
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 | 2
Extend Maturity | 60 | 426
Modify Rate | 0 | 0
Modify Payments | 0 | 12
Total Pre-Modification Outstanding Recorded Investment | 60 | 438
Post- Modification Outstanding Recorded Investment | 60 | 377
Financing Receivable Specific Reserve |  | 0
Specific Reserve | 29 |
Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 13 | 9
Extend Maturity | 0 | 7
Modify Rate | 172 | 214
Modify Payments | 517 | 514
Total Pre-Modification Outstanding Recorded Investment | 689 | 735
Post- Modification Outstanding Recorded Investment | 676 | 677
Financing Receivable Specific Reserve |  | 0
Specific Reserve | 5 |
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 | 1
Extend Maturity | 0 | 0
Modify Rate | 0 | 244
Modify Payments | 12 | 0
Total Pre-Modification Outstanding Recorded Investment | 12 | 244
Post- Modification Outstanding Recorded Investment | 8 | 242
Specific Reserve | 0 | 0
Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 6 | 4
Extend Maturity | 0 | 0
Modify Rate | 31 | 23
Modify Payments | 20 | 4
Total Pre-Modification Outstanding Recorded Investment | 51 | 27
Post- Modification Outstanding Recorded Investment | 47 | 25
Financing Receivable Specific Reserve |  | $ 0
Specific Reserve | 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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