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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) Contract | Mar. 31, 2018 USD ($) Contract
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 12 | 18
Total Pre-Modification Outstanding Recorded Investment | $ 1,487 | $ 8,387
Post- Modification Outstanding Recorded Investment | $ 1,445 | $ 7,393
Troubled Debt Restructuring [Policy Text Block] | 40000 | 775000
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 1 | 2
Total Pre-Modification Outstanding Recorded Investment | $ 61 | $ 4,871
Post- Modification Outstanding Recorded Investment | $ 62 | $ 3,942
Troubled Debt Restructuring [Policy Text Block] | 0 | 531
Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 6 | 11
Total Pre-Modification Outstanding Recorded Investment | $ 580 | $ 441
Post- Modification Outstanding Recorded Investment | $ 570 | $ 404
Troubled Debt Restructuring [Policy Text Block] | 40 | 17
Commercial Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 2 | 1
Total Pre-Modification Outstanding Recorded Investment | $ 798 | $ 3,017
Post- Modification Outstanding Recorded Investment | $ 767 | $ 2,994
Troubled Debt Restructuring [Policy Text Block] | 0 | 227
Loans to individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Number of Contracts | Contract | 3 | 4
Total Pre-Modification Outstanding Recorded Investment | $ 48 | $ 58
Post- Modification Outstanding Recorded Investment | $ 46 | $ 53
Troubled Debt Restructuring [Policy Text Block] | 0 | 0
Extended Maturity [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | $ 17 | $ 7,746
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 4,709
Extended Maturity [Member] | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 17 | 20
Extended Maturity [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 3,017
Extended Maturity [Member] | Loans to individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0
Contractual Interest Rate Reduction [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 605 | 103
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 49 | 75
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 556 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 28
Contractual Payment Modification [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 865 | 538
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 61 | 162
Contractual Payment Modification [Member] | Residential real estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 514 | 346
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | 242 | 0
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Pre-Modification Outstanding Recorded Investment | $ 48 | $ 30

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