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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) Contract | Jun. 30, 2015 USD ($) Contract | Jun. 30, 2016 USD ($) Contract | Jun. 30, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 27 | 18 | 42 | 26
Total Pre-Modification Outstanding Recorded Investment | $ 2,982 | $ 952 | $ 7,960 | $ 3,201
Post- Modification Outstanding Recorded Investment | $ 2,833 | $ 898 | $ 7,405 | $ 3,029
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 114000 | 60000 | 114000 | 60000
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 4 | 2 | 5 | 3
Total Pre-Modification Outstanding Recorded Investment | $ 332 | $ 361 | $ 4,101 | $ 1,860
Post- Modification Outstanding Recorded Investment | $ 217 | $ 317 | $ 3,708 | $ 1,812
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 40 | 53 | 40 | 53
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 17 | 11 | 26 | 16
Total Pre-Modification Outstanding Recorded Investment | $ 1,435 | $ 530 | $ 2,530 | $ 799
Post- Modification Outstanding Recorded Investment | $ 1,428 | $ 525 | $ 2,440 | $ 723
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 7 | 0 | 7
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 4 |  | 6 | 1
Total Pre-Modification Outstanding Recorded Investment | $ 1,198 |  | $ 1,289 | $ 463
Post- Modification Outstanding Recorded Investment | $ 1,173 |  | $ 1,227 | $ 428
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 74 |  | 74 | 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 2 | 5 | 5 | 6
Total Pre-Modification Outstanding Recorded Investment | $ 17 | $ 61 | $ 40 | $ 79
Post- Modification Outstanding Recorded Investment | $ 15 | $ 56 | $ 30 | $ 66
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 0 | 0
Extended Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 1,290 | $ 252 | $ 1,356 | $ 1,751
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 92 | 252 | 92 | 1,751
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 1,198 |  | 1,264 | 0
Extended Maturity [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 251 | 106 | 4,152 | 357
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 240 | 0 | 4,009 | 0
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 45 | 114 | 296
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 11 | 61 | 29 | 61
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 1,441 | 594 | 2,452 | 1,093
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 109 | 0 | 109
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 1,435 | 485 | 2,416 | 503
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 25 | 463
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 6 | $ 0 | $ 11 | $ 18

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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=49124121&loc=SL6953676-111524 + Details
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