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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) Contract | Mar. 31, 2016 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 13 | 16
Total Pre-Modification Outstanding Recorded Investment | $ 817 | $ 4,978
Post- Modification Outstanding Recorded Investment | $ 778 | $ 4,844
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 | 1 | 2
Total Pre-Modification Outstanding Recorded Investment | $ 42 | $ 3,769
Post- Modification Outstanding Recorded Investment | $ 38 | $ 3,749
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0
Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 7 | 8
Total Pre-Modification Outstanding Recorded Investment | $ 536 | $ 988
Post- Modification Outstanding Recorded Investment | $ 504 | $ 910
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 2 | 3
Total Pre-Modification Outstanding Recorded Investment | $ 195 | $ 198
Post- Modification Outstanding Recorded Investment | $ 193 | $ 169
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 | 3
Total Pre-Modification Outstanding Recorded Investment | $ 44 | $ 23
Post- Modification Outstanding Recorded Investment | $ 43 | $ 16
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 | $ 308 | $ 65
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0
Extended Maturity [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 129 | 0
Extended Maturity [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 179 | 65
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 | 157 | 3,901
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 42 | 3,769
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 101 | 114
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 | 14 | 18
Contractual Payment Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 352 | 1,012
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 | 306 | 874
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 16 | 133
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | $ 30 | $ 5

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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=66008989&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + 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=66008989&loc=SL6953676-111524 + Details
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