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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract | Sep. 30, 2017 USD ($) Contract | Sep. 30, 2016 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 7 | 17 | 33 | 57
Total Pre-Modification Outstanding Recorded Investment | $ 203 | $ 4,463 | $ 9,814 | $ 12,186
Post- Modification Outstanding Recorded Investment | $ 189 | $ 4,424 | $ 7,426 | $ 11,262
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 1612000 | 671000 | 1680000
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 1 | 6 | 5
Total Pre-Modification Outstanding Recorded Investment | $ 47 | $ 3,853 | $ 8,601 | $ 7,955
Post- Modification Outstanding Recorded Investment | $ 47 | $ 3,853 | $ 6,307 | $ 7,281
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 1612 | 669 | 1612
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 4 | 11 | 15 | 35
Total Pre-Modification Outstanding Recorded Investment | $ 117 | $ 473 | $ 846 | $ 2,762
Post- Modification Outstanding Recorded Investment | $ 106 | $ 441 | $ 777 | $ 2,620
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 2 | 0
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 1 | 4 | 7
Total Pre-Modification Outstanding Recorded Investment | $ 27 | $ 85 | $ 290 | $ 1,373
Post- Modification Outstanding Recorded Investment | $ 25 | $ 85 | $ 280 | $ 1,285
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 0 | 68
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 4 | 8 | 10
Total Pre-Modification Outstanding Recorded Investment | $ 12 | $ 52 | $ 77 | $ 96
Post- Modification Outstanding Recorded Investment | $ 11 | $ 45 | $ 62 | $ 76
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 | $ 85 | $ 7,076 | $ 1,441
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 6,768 | 93
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 129 | 0
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 85 | 179 | 1,348
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 | 17 | 142 | 2,007 | 4,294
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 1,786 | 4,009
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 17 | 100 | 204 | 214
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 | 0 | 42 | 17 | 71
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 186 | 4,236 | 731 | 6,451
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 47 | 3,853 | 47 | 3,853
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 100 | 373 | 513 | 2,548
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 27 | 0 | 111 | 25
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 12 | $ 10 | $ 60 | $ 25

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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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