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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($) Contract | Mar. 31, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 16 | 8
Total Pre-Modification Outstanding Recorded Investment | $ 4,978 | $ 2,249
Post- Modification Outstanding Recorded Investment | $ 4,844 | $ 2,139
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 2 | 1
Total Pre-Modification Outstanding Recorded Investment | $ 3,769 | $ 1,498
Post- Modification Outstanding Recorded Investment | $ 3,749 | $ 1,476
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0
Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 8 | 5
Total Pre-Modification Outstanding Recorded Investment | $ 988 | $ 269
Post- Modification Outstanding Recorded Investment | $ 910 | $ 203
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 3 | 1
Total Pre-Modification Outstanding Recorded Investment | $ 198 | $ 464
Post- Modification Outstanding Recorded Investment | $ 169 | $ 449
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0
Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 3 | 1
Total Pre-Modification Outstanding Recorded Investment | $ 23 | $ 18
Post- Modification Outstanding Recorded Investment | $ 16 | $ 11
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0
Extended Maturity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | $ 65 | $ 1,498
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 1,498
Extended Maturity [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0
Extended Maturity [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 65 | 0
Extended Maturity [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0
Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 3,901 | 252
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 3,769 | 0
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 114 | 252
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 18 | 0
Contractual Payment Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 1,012 | 499
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0
Contractual Payment Modification [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 874 | 17
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 133 | 464
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | $ 5 | $ 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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