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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, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract | Jun. 30, 2018 USD ($) Contract | Jun. 30, 2017 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 19 | 13 | 35 | 26
Total Pre-Modification Outstanding Recorded Investment | $ 13,066 | $ 8,794 | $ 21,274 | $ 9,611
Post- Modification Outstanding Recorded Investment | $ 12,967 | $ 6,659 | $ 16,690 | $ 7,419
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 3714000 | 964000 | 4301000 | 964000
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 7 | 3 | 8 | 4
Total Pre-Modification Outstanding Recorded Investment | $ 11,679 | $ 8,513 | $ 16,389 | $ 8,554
Post- Modification Outstanding Recorded Investment | $ 11,591 | $ 6,385 | $ 11,972 | $ 6,422
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 3714 | 960 | 4095 | 960
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 6 | 5 | 17 | 12
Total Pre-Modification Outstanding Recorded Investment | $ 383 | $ 193 | $ 824 | $ 729
Post- Modification Outstanding Recorded Investment | $ 381 | $ 189 | $ 779 | $ 683
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 4 | 0 | 4
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 2 | 1 | 3 | 3
Total Pre-Modification Outstanding Recorded Investment | $ 966 | $ 68 | $ 3,983 | $ 263
Post- Modification Outstanding Recorded Investment | $ 960 | $ 68 | $ 3,870 | $ 258
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 206 | 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 4 | 4 | 7 | 7
Total Pre-Modification Outstanding Recorded Investment | $ 38 | $ 20 | $ 78 | $ 65
Post- Modification Outstanding Recorded Investment | $ 35 | $ 17 | $ 69 | $ 56
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 | $ 0 | $ 6,768 | $ 7,747 | $ 7,076
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 6,768 | 4,710 | 6,768
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 20 | 129
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 3,017 | 179
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 | 24 | 1,833 | 127 | 1,990
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 1,745 | 0 | 1,786
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 85 | 75 | 187
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 24 | 3 | 52 | 17
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 13,042 | 193 | 13,400 | 545
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 11,679 | 0 | 11,679 | 0
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 383 | 108 | 729 | 413
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 966 | 68 | 966 | 84
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 14 | $ 17 | $ 26 | $ 48

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