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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 USD ($) Contract | Mar. 31, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 18 | 13
Total Pre-Modification Outstanding Recorded Investment | $ 8,387 | $ 817
Post- Modification Outstanding Recorded Investment | $ 7,393 | $ 778
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 775000 | 0
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 2 | 1
Total Pre-Modification Outstanding Recorded Investment | $ 4,871 | $ 42
Post- Modification Outstanding Recorded Investment | $ 3,942 | $ 38
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 531 | 0
Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 11 | 7
Total Pre-Modification Outstanding Recorded Investment | $ 441 | $ 536
Post- Modification Outstanding Recorded Investment | $ 404 | $ 504
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 17 | 0
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 1 | 2
Total Pre-Modification Outstanding Recorded Investment | $ 3,017 | $ 195
Post- Modification Outstanding Recorded Investment | $ 2,994 | $ 193
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 227 | 0
Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | Contract | 4 | 3
Total Pre-Modification Outstanding Recorded Investment | $ 58 | $ 44
Post- Modification Outstanding Recorded Investment | $ 53 | $ 43
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 | $ 7,746 | $ 308
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 4,709 | 0
Extended Maturity [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 20 | 129
Extended Maturity [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 3,017 | 179
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 | 103 | 157
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 42
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 75 | 101
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 | 28 | 14
Contractual Payment Modification [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 538 | 352
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 162 | 0
Contractual Payment Modification [Member] | Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 346 | 306
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 16
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | $ 30 | $ 30

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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=84173941&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=84173941&loc=SL6953676-111524 + Details
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